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Java related published Questions

How to char array to string in java (Java Programming Language)

#Answer#

Piya gvgtvwq answered


1
      // Method 1: Using String object
2
      char[] ch = {'g', 'o', 'o', 'd', ' ', 'm', 'o', 'r', 'n', 'i', 'n', 'g'};
3
      String str = new String(ch);
4
      System.out.println(str);
5
 

How to hello world (Java Programming Language)

#Answer#

Adosy Hashim answered


1
<p>Hello World </p>

How to enum java (Java Programming Language)

#Answer#

Nishu xdgkc Varun answered


1
public enum AlertLevel {
2
    Undefined(0),
3
    Ok(1),
4
    Warning(2),
5
    Alarm(3);
6
}

How to toString convert to long (Java Programming Language)

#Answer#

Anamika Waked answered


1
long l = 12345L;
2
//deprecated from Java 9, use valueOf for better performance
3
String str = new Long(l).toString(); // str is '12345'

How to android studio timers (Java Programming Language)

#Answer#

Atif Ali answered


1
Timer()
2
Creates a new timer.
3
4
Timer(boolean isDaemon)
5
Creates a new timer whose associated thread may be specified to Thread#setDaemon.
6
7
Timer(String name)
8
Creates a new timer whose associated thread has the specified name.
9
10
Timer(String name, boolean isDaemon)
11
Creates a new timer whose associated thread has the specified name, and may be specified to Thread#setDaemon.

How to java int array (Java Programming Language)

#Answer#

Jatinder Chaddha answered


1
int[] theNumbers = new int[5];
2
arr[0] = 4;
3
arr[1] = 8;
4
arr[2] = 15;
5
arr[3] = 16;
6
arr[4] = 23;
7
arr[5] = 42;

How to cmd java compile (Java Programming Language)

#Answer#

Neelanchal Kale answered


1
javac MyFisrtProgam.java // enter to compile 
2
  java MyfirstProgram // run program 

How to random boolean java (Java Programming Language)

#Answer#

yfxssdpa M answered


1
return Math.random() < 0.5;

How to how to install java 8 and set java_home in ubuntu (Java Programming Language)

#Answer#

Trisha Sien answered


1
sudo apt install openjdk-8-jdk

How to overloading and overriding in java (Java Programming Language)

#Answer#

Udarathi Raman answered


1
Method overloading is providing two separate methods in a class with the same name but different arguments, while the method return type may or may not be different, which allows us to reuse the same method name.
2
Method overriding means defining a method in a child class that is already defined in the parent class with the same method signature, same name, arguments, and return type

How to how to get child from layout in android (Java Programming Language)

#Answer#

Nilu Agnihotri, answered


1
LinearLayout layout = setupLayout();
2
int count = layout.getChildCount();
3
View v = null;
4
for(int i=0; i<count; i++) {
5
    v = layout.getChildAt(i);
6
    //do something with your child element
7
}

How to java array to arraylist (Java Programming Language)

#Answer#

qhni Brasile answered


1
List<Element> list = Arrays.asList(array);

How to android studio invalid gradle jdk configuration found. open gradle settings use jdk from project structure (Java Programming Language)

#Answer#

Yashoda Pattnayak answered


1
Delete these generated files:
2
.idea/gradle.xml
3
.idea/workspace.xml
4
then click try again to sync the project.

How to remove element from array java (Java Programming Language)

#Answer#

Ashok Marketing answered


1
Use ArrayList XD
2
import java.util.ArrayList;
3
array.remove(i); //remove element by index

How to how to set 2 decimal places in java (Java Programming Language)

#Answer#

Nicodemus Tahir answered


1
DecimalFormat df = new DecimalFormat();
2
df.setMaximumFractionDigits(2);
3
System.out.println(df.format(decimalNumber));

How to char to charsequence in java (Java Programming Language)

#Answer#

Kanwar Chanchal answered


1
    String a = abc;
2
    String b = anthony;
3
    char c = a.charAt(0);
4
    b.contains(" + c);
5
    b.contains(String.valueOf(c));

How to bufferedreader in java (Java Programming Language)

#Answer#

Waleed Varshitha answered


1
class Main {
2
    public static void main (String[] args) throws IOException{
3
                      
4
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
5
        String[] str = br.readLine().split( );      // 6 2
6
        String[] input = br.readLine().split( );   // 1 2 3 4 5 6
7
        int n = Integer.parseInt(str[0]);  // 6
8
        int k = Integer.parseInt(str[1]);  // 2
9
        
10
        int [] arr = new int [n];
11
        
12
        for(int i=0; i<n; i++) 
13
        {
14
         arr[i] = Integer.parseInt(input[i]);  // 1 2 3 4 5 6
15
        }
16
      
17
      
18
    }
19
}

How to how to write a junit test case in java (Java Programming Language)

#Answer#

Monalisa csghavt answered


1
import static org.junit.jupiter.api.Assertions.assertEquals;
2
import org.junit.jupiter.api.Test;
3
public class MyTests {
4
    @Test
5
    public void multiplicationOfZeroIntegersShouldReturnZero() {
6
        MyClass tester = new MyClass(); // MyClass is tested
7
        // assert statements
8
        assertEquals(0, tester.multiply(10, 0), 10 x 0 must be 0);
9
        assertEquals(0, tester.multiply(0, 10), 0 x 10 must be 0);
10
        assertEquals(0, tester.multiply(0, 0), 0 x 0 must be 0);
11
    }
12
}

How to remove spaces at beginning and end of string java (Java Programming Language)

#Answer#

Wissam Bruschi answered


1
String withSpaces =   Hi  ;
2
String withoutSpaces = withSpaces.trim();

How to Java catch multiple exceptions and rethrow exception (Java Programming Language)

#Answer#

Shahxad mizvbf Khurram answered


1
// Before java 7 - syntax Java catch multiple exceptions and rethrow exception
2
try
3
{
4
   // code that throw exceptions 1 and 3
5
}
6
catch(SQLException e)
7
{
8
   logger.log(e);
9
}
10
catch(IOException e)
11
{
12
   logger.log(e);
13
}
14
catch(Exception e)
15
{
16
   logger.severe(e);
17
}

How to delay a function call in java (Java Programming Language)

#Answer#

Acero hcopss Jimmy answered


1
new java.util.Timer().schedule( 
2
        new java.util.TimerTask() {
3
            @Override
4
            public void run() {
5
                // your code here
6
            }
7
        }, 
8
        5000 
9
);

How to java bubble sort short circuit (Java Programming Language)

#Answer#

Dominik Ben answered


1
public static void BubbleSortShortSC(int[] array)
2
    {
3
        for(int i = 0; i < array.length - 1; i++)
4
        {
5
            boolean sorted = true;
6
            for (int j = 0; j < array.length - i - 1; j++)
7
            {
8
                if(array[j] < array[j+1])
9
                {
10
                    int temp = array[j];
11
                    array[j] = array[j+1];
12
                    array[j+1] = temp;
13
                    sorted = false;
14
                }
15
            }
16
            if (sorted)
17
                break;
18
        }
19
    }

How to android.permission.INTERNET (Java Programming Language)

#Answer#

Tahir cegqitd Kate answered


1
<uses-permission android:name=android.permission.INTERNET/>
2
 
3
<application>
4
    <activity android:name=.activities.MyActivity
5
        android:permission=android.permission.INTERNET />
6
</application>

How to log10 in java (Java Programming Language)

#Answer#

Vincent abjyng answered


1
Math.log10()

How to java jpa criteriabuilder in xample (Java Programming Language)

#Answer#

Alter Ikraam answered


1
CriteriaQuery<DeptEmployee> criteriaQuery = 
2
  criteriaBuilder.createQuery(DeptEmployee.class);
3
Root<DeptEmployee> root = criteriaQuery.from(DeptEmployee.class);
4
In<String> inClause = criteriaBuilder.in(root.get(title));
5
for (String title : titles) {
6
    inClause.value(title);
7
}
8
criteriaQuery.select(root).where(inClause);

How to android xml hide (Java Programming Language)

#Answer#

Niren Vatsalya answered


1
android:visibility=gone

How to kotlin android intent pass data (Java Programming Language)

#Answer#

Nagma Vasant answered


1
//Send value from HomeActivity
2
val intent = Intent(this@HomeActivity,ProfileActivity::class.java)
3
intent.putExtra(Username,John Doe)
4
startActivity(intent)
5
//Get values in ProfileActivity
6
val profileName=intent.getStringExtra(Username)

How to stack overflow recyclerview (Java Programming Language)

#Answer#

Waleed viszl Oishi answered


1
<?xml version=1.0 encoding=utf-8?>
2
<LinearLayout
3
    xmlns:android=http://schemas.android.com/apk/res/android
4
    android:layout_width=match_parent
5
    android:layout_height=wrap_content
6
    android:orientation=horizontal
7
    android:padding=10dp>
8
    <TextView
9
        android:id=@+id/tvAnimalName
10
        android:layout_width=wrap_content
11
        android:layout_height=wrap_content
12
        android:textSize=20sp/>
13
</LinearLayout>

How to ConcurrentModificationException fix (Java Programming Language)

#Answer#

Spruha Singh answered


1
//Occurs when trying to remove an element from a Collection
2
//while iterating over it
3
//Where removal takes place
4
//Setup an iterator
5
Iterator<Thing> iter = things.iterator();
6
//Iterate over collection
7
while(iter.hasNext()) {
8
    Thing thing = iter.next();
9
    if (/* Some Condition that initiates removal */) {
10
      //Remove using iterator
11
      iter.remove();
12
    }
13
}
14
//Avoids ConcurrentModificationException

How to java sort 2d array (Java Programming Language)

#Answer#

Carson otlv answered


1
Arrays.sort(myArr, (a, b) -> a[0] - b[0]);

How to system.out.println (Java Programming Language)

#Answer#

Ejaz Micheal answered


1
public static void main(String[] args){
2
    System.out.println(Hello World); 
3
}

How to sprintf (Java Programming Language)

#Answer#

Abrez Antti answered


1
int sprintf(char *str, const char *format, ...)
2
3
Parameters:
4
5
str  This is the pointer to an array of char elements where the resulting C string is stored.
6
7
format  This is the String that contains the text to be written to buffer. It can optionally contain embedded format tags that are replaced by the values specified in subsequent additional arguments and formatted as requested. Format tags prototype: %[flags][width][.precision][length]specifier
8
9
EXAMPLE:
10
11
#include <stdio.h>
12
#include <math.h>
13
14
int main () {
15
   char str[80];
16
17
   sprintf(str, "Value of Pi = %f", M_PI);
18
   puts(str);
19
   
20
   return(0);
21
}
22
23
OUTPUT:
24
25
Value of Pi = 3.141593

How to change drawable color programmatically android (Java Programming Language)

#Answer#

Mahie Sheeba answered


1
//resource
2
Drawable unwrappedDrawable = AppCompatResources.getDrawable(context, R.drawable.my_drawable); 
3
Drawable wrappedDrawable = DrawableCompat.wrap(unwrappedDrawable);
4
DrawableCompat.setTint(wrappedDrawable, Color.RED);    
5
//activity
6
Drawable unwrappedDrawable = tvContinue.getBackground();
7
Drawable wrappedDrawable = DrawableCompat.wrap(unwrappedDrawable);
8
DrawableCompat.setTint(wrappedDrawable, (Color.parseColor(getPreferences().getString(Constant.SECOND_COLOR, Constant.SECONDARY_COLOR))));
9
//adapter
10
Drawable unwrappedDrawable = holder.tvOff.getBackground();
11
 Drawable wrappedDrawable = DrawableCompat.wrap(unwrappedDrawable);
12
 DrawableCompat.setTint(wrappedDrawable, (Color.parseColor(((BaseActivity) activity).getPreferences().getString(Constant.SECOND_COLOR, Constant.SECONDARY_COLOR))));
13
//

How to hide the title bar android studio (Java Programming Language)

#Answer#

Perizaad Gesner answered


1
getSupportActionBar().hide();

How to shakescleare merchant of venice (Java Programming Language)

#Answer#

Shray Sujata answered


1
class java
2
{ 
3
  public static void main()
4
  {
5
    system.out.println(leave it);
6
  }
7
}

How to équivalent setTimeInterval java (Java Programming Language)

#Answer#

Mansi Vijayshanti answered


1
// Param is optional, to run task on UI thread.     
2
Handler handler = new Handler(Looper.getMainLooper());
3
Runnable runnable = new Runnable() {
4
    @Override
5
    public void run() {
6
        // Do the task...
7
        handler.postDelayed(this, milliseconds) // Optional, to repeat the task.
8
    }
9
};
10
handler.postDelayed(runnable, milliseconds);
11
// Stop a repeating task like this.
12
handler.removeCallbacks(runnable);

How to how to use javadoc (Java Programming Language)

#Answer#

Melanie Corp answered


1
public class Address implements Cloneable
2
{
3
    public String street;
4
    public String city;
5
    public String state;
6
    public String zipCode;
7
}

How to spring boot mongodb update subdocument (Java Programming Language)

#Answer#

Jeethu Shringarpore answered


1
final Query query = new Query(new Criteria().andOperator(
2
        Criteria.where(_id).is(id),
3
        Criteria.where(listA).elemMatch(Criteria.where(_id).is(id))
4
));
5
final Update update = new Update().addToSet(listA.$.listB, stuff).set(listA.$.thing, thing);
6
final WriteResult wr = mongoOperations.updateFirst(query, update, collectionName);

How to java letter alphabet index (Java Programming Language)

#Answer#

Amala Sissel answered


1
String str = abcdef;
2
char[] ch  = str.toCharArray();
3
for(char c : ch){
4
    int temp = (int)c;
5
    int temp_integer = 96; //for lower case
6
    if(temp<=122 & temp>=97)
7
        System.out.print(temp-temp_integer);
8
}

How to char variable java (Java Programming Language)

#Answer#

Andy Venkatarathnam answered


1
char inital = 'N';
2
// IT IS IMPORTANT TO REMEMBER TO USE SINGLE QUOTES WHEN WRITING CHAR OR IT WON'T WORK

How to instance method and static method (Java Programming Language)

#Answer#

Jainendra Karolak answered


1
static or class method
2
1) A method that is declared as static is known as the static method
3
2) We don't need to create the objects to call the static methods
4
3) Non-static (instance) members cannot be accessed in static context 
5
(static method, static block and static nested class) directly.
6
4) For example: public static int cube(int n){
7
return n*n*n*; (multiply *) }
8
Instance method
9
1) A method that is not declared as static is known as the instance method.
10
2) The object is required to call the instance method.

How to how to call a function in java (Java Programming Language)

#Answer#

mhbo Shahzad answered


1
public class MyClass {
2
 
3
    static void myMethod() {
4
        System.out.println(You have called me! My name is: myMethod!);
5
    }
6
 
7
    public static void main(String[] args) {
8
        myMethod();
9
    }
10
}

How to actionListener java (Java Programming Language)

#Answer#

Usman ifxxt answered


1
import java.awt.event.ActionEvent;
2
import java.awt.event.ActionListener;
3
/*in main*/
4
button.addActionListener(new ActionListener() {
5
  public void actionPerformed(ActionEvent e) {
6
            System.out.println('x');
7
  }
8
});

How to spring security logging (Java Programming Language)

#Answer#

Daily MK answered


1
logging.level.org.springframework.security=DEBUG

How to java compare strings alphabetically (Java Programming Language)

#Answer#

Sonal pvt answered


1
String a = HYRE; 
2
String b = AGNYG;  
3
int compare = a.compareTo(b);  
4
if (compare < 0) {  
5
    //a is smaller
6
}
7
else if (compare > 0) {
8
    //a is larger 
9
}
10
else {  
11
    //a is equal to b
12
} 

How to calculate average java (Java Programming Language)

#Answer#

M.I. Niyogi answered


1
Just some minor modification to your code will do (with some var renaming for clarity) :
2
double sum = 0; //average will have decimal point
3
for(int i=0; i < args.length; i++){
4
   //parse string to double, note that this might fail if you encounter a non-numeric string
5
   //Note that we could also do Integer.valueOf( args[i] ) but this is more flexible
6
   sum += Double.valueOf( args[i] ); 
7
}
8
double average = sum/args.length;
9
System.out.println(average );

How to arrays sort 2d array java (Java Programming Language)

#Answer#

Olleras Jason answered


1
Arrays.sort(myArr,(double[] a,double[] b)->{
2
                //here multiple lines of code can be placed
3
                return a[0]-b[0]; 
4
            });

How to how to add objects in array java (Java Programming Language)

#Answer#

Ramanand Pauly answered


1
car redCar = new Car(Red);
2
car Garage [] = new Car [100];
3
Garage[0] = redCar;

How to double parse jtextfield (Java Programming Language)

#Answer#

Helen Randhir, answered


1
public static void main(String[] args) {
2
    double amount=0.0;
3
    try {
4
         amount = Double.parseDouble(txtMonth.getText());
5
    } catch (Exception e) {
6
        System.err.println(ups, this was not castable to double);
7
          amount=-10.0;
8
    }
9
    System.out.println(Here is the double: + amount);
10
}

How to java random number generator in range (Java Programming Language)

#Answer#

reaavoe La answered


1
int rand = ThreadLocalRandom.current().nextInt(x,y);

How to how to use Log android studio Java (Java Programming Language)

#Answer#

Ram edobeo Chaithra answered


1
import android.util.Log;
2
Log.d(tagString, messageString);

How to SLF4J: Failed to load class org.slf4j.impl.StaticLoggerBinder. (Java Programming Language)

#Answer#

Nafisa Kokate answered


1
// Using Kotlin
2
implementation(org.slf4j:slf4j-api:1.7.5)
3
implementation(org.slf4j:slf4j-log4j12:1.7.5)

How to viewresolver in spring boot (Java Programming Language)

#Answer#

Tatineni Siddharth answered


1
@EnableWebMvc
2
@Configuration
3
@ComponentScan(com.baeldung.web)
4
public class WebConfig implements WebMvcConfigurer {
5
    // All web configuration will go here
6
}

How to continue in java (Java Programming Language)

#Answer#

Arvind okwatza answered


1
int i=0;
2
while(i<10){
3
  if(i%2==0){
4
    i++;
5
    continue;// If it's pair we return to the while
6
  }
7
  System.out.println(i);// If is not we print it.
8
  i++;
9
}

How to this keyword in java (Java Programming Language)

#Answer#

Ronald mfor answered


1
// this keyword in java example
2
import java.util.*;
3
class Demo
4
{
5
   // instance variable
6
   int m;
7
   int n;
8
   public void setValue(int m, int n)
9
   {
10
      m = m;
11
      n = n;
12
   }
13
   public void showValue()
14
   {
15
      System.out.println(Value m =  + m);
16
      System.out.println(Value n =  + n);
17
   }
18
}
19
public class ThisKeywordDemo
20
{
21
   public static void main(String[] args)
22
   {
23
      Demo obj = new Demo();
24
      obj.setValue(5, 6);
25
      obj.showValue();
26
   }
27
}

How to java 8 map foreach (Java Programming Language)

#Answer#

Rathorde Om answered


1
public void iterateUsingIteratorAndEntry(Map<String, Integer> map) {
2
    Iterator<Map.Entry<String, Integer>> iterator = map.entrySet().iterator();
3
    while (iterator.hasNext()) {
4
        Map.Entry<String, Integer> entry = iterator.next();
5
        System.out.println(entry.getKey() + : + entry.getValue());
6
    }
7
}

How Could They download or watch Udemy Core Java Made Easy (Covers the latest Java 15) video tutorials for free?

#Answer#

Akruti shinde answered


Core Java Made Easy (Covers the latest Java 15),Udemy.

6 ☆ / 5

To download tutorial or watch: Core Java Made Easy (Covers the latest Java 15)

Why this tutorial?

Udemy Core Java Made Easy (Covers the latest Java 15)

Note: Master java in quick and simple steps. Bharath Thippireddy is the instructor of this tutorials.

To download tutorial or watch: Core Java Made Easy (Covers the latest Java 15)

Benefits from this tutorials

  1. Learn the fundamentals of java and oops
  2. Learn the building blocks of a java program
  3. Handle Exceptions
  4. Use flow control and looping statements
  5. Implement encapsulation polymorphism inheritance and abstraction
  6. Read and Write files
  7. Write multi threaded programs
  8. Understand and use Garbage Collection
  9. Learn and create the different types of inner classes
  10. Understand and master Strings
  11. Learn collections in depth
  12. Use functional interfaces and lambda expressions
  13. Understand the internal of JVM
  14. Interview Questions updated regularly
  15. Use Concurrent Collections and Enums
  16. Implement Internationalization and also use annotations
  17. See how reflection API can be used to dynamically load classes ,create objects and invoke methods
  18. Gain debugging skills
  19. Work on various usecases and coding problems
  20. Understand and use Wrapper Classes and Autoboxing
  21. Use Datatypes, Literals, Variables and Typecasting
  22. Implement Inter Thread Communication
  23. Specify different access modifiers
  24. Use Datatypes, Literals, Variables and Typecasting
  25. All in quick and easy steps

To download tutorial or watch: Core Java Made Easy (Covers the latest Java 15)

Video Tutorial Details

  • Learn the fundamentals of java and oops
  • Learn the building blocks of a java program
  • Handle Exceptions
  • Use flow control and looping statements
  • Implement encapsulation polymorphism inheritance and abstraction
  • Read and Write files
  • Write multi threaded programs
  • Understand and use Garbage Collection
  • Learn and create the different types of inner classes
  • Understand and master Strings
  • Learn collections in depth
  • Use functional interfaces and lambda expressions
  • Understand the internal of JVM
  • Interview Questions updated regularly
  • Use Concurrent Collections and Enums
  • Implement Internationalization and also use annotations
  • See how reflection API can be used to dynamically load classes ,create objects and invoke methods
  • Gain debugging skills
  • Work on various usecases and coding problems
  • Understand and use Wrapper Classes and Autoboxing
  • Use Datatypes, Literals, Variables and Typecasting
  • Implement Inter Thread Communication
  • Specify different access modifiers
  • Use Datatypes, Literals, Variables and Typecasting
  • All in quick and easy steps

To download tutorial or watch: Core Java Made Easy (Covers the latest Java 15)

How to java get an int from a char (Java Programming Language)

#Answer#

Jules sviw answered


1
char charValue = '2';
2
int intValue = Character.getNumericValue(charValue); // 2

How to java como comprobar que un numero es entero? (Java Programming Language)

#Answer#

Mahipal Khalekar answered


1
public boolean isInteger(String numero){
2
    try{
3
        Integer.parseInt(numero);
4
        return true;
5
    }catch(NumberFormatException e){
6
        return false;
7
    }
8
}

How to how to use old android studio project (Java Programming Language)

#Answer#

Swamy, Morajkar answered


1
Open up this file in your project:
2
<project>/gradle/wrapper/gradle-wrapper.properties
3
Edit the distributionUrl line and set it too:
4
distributionUrl=http\://services.gradle.org/distributions/gradle-1.8-all.zip
5
Rebuild your project.
6
</project>

How to prime check java (Java Programming Language)

#Answer#

Keshavrao Hasan answered


1
  static boolean isPrime(int n){
2
        boolean result=true;
3
        if(n <= 1) return false;
4
        for(int i = 2; i <= n/2; i++){ //n/2 because the largest factor of any number is either it's half or less than it
5
            if(n % i == 0){
6
                result = false; //if some number divides it, then prime=false;
7
                break;
8
            }
9
        }
10
        return result;
11
    }

How to area of equilateral triangle java (Java Programming Language)

#Answer#

Pinoynurse Ciji answered


1
import java.util.Scanner;
2
public class Main {
3
    public static void main(String[] args) {
4
        // area of equilateral triangle
5
        Scanner scanner = new Scanner(System.in);
6
        System.out.print(Enter the equal length: );
7
        float equalLength = scanner.nextFloat();
8
        double area = (Math.sqrt(3) / 4) * Math.pow(equalLength,2);
9
        System.out.printf(The area is %.2f,area);
10
    }
11
}

How to hashtable contains key java (Java Programming Language)

#Answer#

Dulquer Carryminati answered


1
Hash_table.containsKey(key_element)

How to ArrayList Object[] toArray() method in java (Java Programming Language)

#Answer#

Shakir Guillory answered


1
import java.util.ArrayList;
2
import java.util.List;
3
public class ArrayListObjectToArrayMethodExample
4
{
5
   public static void main(String[] args)
6
   {
7
      List<Integer> al = new ArrayList<Integer>();
8
      al.add(12);
9
      al.add(14);
10
      al.add(16);
11
      al.add(18);
12
      al.add(20);
13
      Object[] obj = al.toArray();
14
      for(Object num : obj)
15
      {
16
         System.out.print(num +  );
17
      }
18
   }
19
}

How to how to define a collection in java (Java Programming Language)

#Answer#

Sachiin Mehra answered


1
 List<String> list = Arrays.asList(Lars, Simon);

How to java string contains at beginning (Java Programming Language)

#Answer#

Omnia rgwmo answered


1
public class StringExample 
2
{
3
    public static void main(String[] args) 
4
    {
5
        String blogName = howtodoinjava.com;
6
         
7
        blogName.startsWith(null);
8
    }
9
}

How to Pascal triangle program in java without using arrays (Java Programming Language)

#Answer#

Dilzan Jayarajan answered


1
// Pascal triangle program in java without using arrays
2
import java.util.Scanner;
3
public class PascalTriangleDemo 
4
{
5
   public static void main(String[] args) 
6
   {
7
      System.out.println(Please enter number of rows to print pascal's triangle: );
8
      Scanner sc = new Scanner(System.in);
9
      int row = sc.nextInt();            
10
      System.out.println(Pascal's triangle with  + row +  rows.);
11
      displayPascalTriangle(row);
12
      sc.close();
13
   }
14
   public static void displayPascalTriangle(int r) 
15
   {
16
      for(int a = 0; a < r; a++) 
17
      {
18
         int num = 1;
19
         System.out.printf(% + (r - a) * 2 + s, ");
20
         for(int b = 0; b <= a; b++) 
21
         {
22
            System.out.printf(%4d, num);
23
            num = num * (a - b) / (b + 1);
24
         }
25
         System.out.println();
26
      }
27
   }
28
}

How to java quit application (Java Programming Language)

#Answer#

Jeevant akva answered


1
System.exit(n);

How to get last element of array java (Java Programming Language)

#Answer#

Rice Jatin answered


1
firstNum = numbers[0];
2
lastNum = numbers[numbers.length-1];

How to fhow to find location of java jdk (Java Programming Language)

#Answer#

kqbr R answered


1
gcm -All java

How to java shorthand if (Java Programming Language)

#Answer#

Rajashree Vishwasrao answered


1
//Clear example with good readabilty
2
String var = Text;
3
String shortHand = (var.equals(Text) ? Returns this if true : Returns this if false);
4
//Other example that is less readable
5
int var = 9;
6
int shortHand = var == 9 ? 1 : var++;
7
//Pseudo code
8
// CONDITION ? returns when true : returns when false

How to java change image color (Java Programming Language)

#Answer#

AK Ratnamala answered


1
import java.awt.image.BufferedImage;
2
import java.awt.image.WritableRaster;
3
import java.io.File;
4
// w w w  . jav  a 2s  . com
5
import javax.imageio.ImageIO;
6
public class Main {
7
  public static void main(String[] args) throws Exception {
8
    BufferedImage img = colorImage(ImageIO.read(new File(NWvnS.png)));
9
    ImageIO.write(img, png, new File(Test.png));
10
  }
11
  private static BufferedImage colorImage(BufferedImage image) {
12
    int width = image.getWidth();
13
    int height = image.getHeight();
14
    WritableRaster raster = image.getRaster();
15
    for (int xx = 0; xx < width; xx++) {
16
      for (int yy = 0; yy < height; yy++) {
17
        int[] pixels = raster.getPixel(xx, yy, (int[]) null);
18
        pixels[0] = 0;
19
        pixels[1] = 255;
20
        pixels[2] = 255;
21
        raster.setPixel(xx, yy, pixels);
22
      }
23
    }
24
    return image;
25
  }
26
}

How to Matrix multiplication in java using function (Java Programming Language)

#Answer#

Jaiswal Abdelrahman answered


1
// matrix multiplication java
2
public class MatrixMultiplicationJavaDemo 
3
{
4
   public static int[][] multiplyMatrix(int[][] matrix1, int[][] matrix2, int row, int column, int col)
5
   {
6
      int[][] multiply = new int[row][col];
7
      for(int a = 0; a < row; a++) 
8
      {
9
         for(int b = 0; b < col; b++) 
10
         {
11
            for(int k = 0; k < column; k++) 
12
            {
13
               multiply[a][b] += matrix1[a][k] * matrix2[k][b];
14
            }
15
         }
16
      }
17
      return multiply;
18
   }
19
   public static void printMatrix(int[][] multiply) 
20
   {
21
      System.out.println(Multiplication of two matrices: );
22
      for(int[] row : multiply) 
23
      {
24
         for(int column : row) 
25
         {
26
            System.out.print(column +     );
27
         }
28
         System.out.println();
29
      }
30
   }
31
   public static void main(String[] args) 
32
   {
33
      int row = 2, col = 3;
34
      int column = 2;
35
      int[][] matrixOne = {{1, 2, 3}, {4, 5, 6}};
36
      int[][] matrixTwo = {{7, 8}, {9, 1}, {2, 3}};
37
      int[][] product = multiplyMatrix(matrixOne, matrixTwo, row, col, column);
38
      printMatrix(product);
39
   }
40
}

How to string char at java (Java Programming Language)

#Answer#

Farha srsd answered


1
char ch=name.charAt(4);

How to CodeHS java 9.2.7 (Java Programming Language)

#Answer#

Narendra Ashchit answered


1
//CodeHS AP Computer Science A Java, 9.2.7: Instruments
2
//DO NOT COPY AND PASTE, YOUR TEACHER CAN SEE YOUR EDIT HISTORY.
3
//Part 2/3
4
//Instrument.java
5
public class Instrument
6
{
7
    String name = ";
8
    String family = ";
9
    
10
    public Instrument(String name, String family){
11
        this.name = name;
12
        this.family = family;
13
    }
14
    
15
    public Instrument(String name){
16
        this.name = name;
17
    }
18
    
19
    public void setName(String str){
20
        this.name = str;
21
    }
22
    
23
    public String getName(){
24
        return this.name;
25
    }
26
    
27
    public void setFamily(String str){
28
        this.family = str;
29
    }
30
    
31
    public String getFamily(){
32
        return this.family;
33
    }
34
    
35
    public String toString(){
36
        return name +  is a member of the  + family +  family.;
37
    }
38
    
39
}

How to horizontalAlignment center jlabel (Java Programming Language)

#Answer#

Lahiri rvdgsof Peterson answered


1
JLabel lab=new JLabel(text);
2
lab.setHorizontalAlignment(SwingConstants.LEFT);     

How to java new string array (Java Programming Language)

#Answer#

Vanya Tiku answered


1
String[] myStringArray = new String[3];
2
String[] myStringArray = {a, b, c};
3
String[] myStringArray = new String[]{a, b, c};

How to how to input in java (Java Programming Language)

#Answer#

Liikkanen Masud answered


1
import java.util.*; //or java.util.scanner
2
Scanner doit = new Scanner(System.in);//Name the scanner
3
System.out.println(Username:);//It will specify username
4
String username = doit.next();//Use scanner and add .next for string .nextInt for int and follows

How to java get size of matrix (Java Programming Language)

#Answer#

Kuldip Jayaraman answered


1
//Get rows size matrix
2
matrix.length;
3
//Get columns size of matrix
4
matrix[0].length;

How to Linked List implementation (Java Programming Language)

#Answer#

Brandel Zara answered


1
public class LinkedList {
2
    private Node head;
3
    private int length = 0;
4
    public LinkedList() {
5
        this.head = new Node(null);
6
    }
7
    public int size() {
8
        return length;
9
    }
10
     // Adds an element to the end of the list
11
    public void add(Object data)  {
12
        Node node = new Node(data);
13
        Node iterator = head;
14
        while (iterator.getNext() != null){
15
            iterator = iterator.getNext();
16
        }
17
        iterator.setNext(node);
18
        length++;
19
    }
20
     // Obtains an element by index
21
    public Object get(int index) {
22
        if (head.getNext() == null || index >= length){
23
            return null;
24
        }
25
        Node iterator = head.getNext();
26
        int counter = 0;
27
        while(counter < index){
28
            iterator = iterator.getNext();
29
            counter++;
30
        }
31
        return iterator.getData();
32
    }
33
     // Returns the index of the element in the list
34
    public int indexOf(Object data) {
35
        Node obj=head;
36
        for (int i = 0; i < length; i++) {
37
            obj = obj.getNext();
38
            if (obj.getData().equals(data)) {
39
                return i;
40
            }
41
        }
42
        return -1;
43
        //throw new Exception(Data not found);
44
    }
45
     // Removes an element from the list
46
    public boolean remove(Object data) {
47
        if (head.getNext() == null){
48
            return false;
49
        }
50
        Node iterator = head;
51
        while(iterator.getNext() != null){
52
            if (iterator.getNext().getData().equals(data)){
53
                iterator.setNext(iterator.getNext().getNext());
54
                length--;
55
                return true;
56
            }
57
            iterator = iterator.getNext();
58
        }
59
        return false;
60
    }
61
    private class Node {
62
        private Object data;
63
        private Node next;
64
        public Node(Object data) {
65
            this.data = data;
66
            next = null;
67
        }
68
        public Object getData() {
69
            return data;
70
        }
71
        public void setData(Object data) {
72
            this.data = data;
73
        }
74
        public Node getNext() {
75
            return next;
76
        }
77
        public void setNext(Node next) {
78
            this.next = next;
79
        }
80
    }
81
}

How to doubly linked list implementation java (Java Programming Language)

#Answer#

Techy hzbhq answered


1
class DoublyLinkedList {    
2
    //A node class for doubly linked list
3
    class Node
4
        int item
5
        Node previous
6
        Node next
7
   
8
        public Node(int item) {  
9
            this.item = item
10
        }  
11
    }  
12
    //Initially, heade and tail is set to null
13
    Node head, tail = null
14
   
15
    //add a node to the list  
16
    public void addNode(int item) {  
17
        //Create a new node  
18
        Node newNode = new Node(item);  
19
   
20
        //if list is empty, head and tail points to newNode  
21
        if(head == null) {  
22
            head = tail = newNode
23
            //head's previous will be null  
24
            head.previous = null
25
            //tail's next will be null  
26
            tail.next = null
27
        }  
28
        else
29
            //add newNode to the end of list. tail->next set to newNode  
30
            tail.next = newNode
31
            //newNode->previous set to tail  
32
            newNode.previous = tail
33
            //newNode becomes new tail  
34
            tail = newNode
35
            //tail's next point to null  
36
            tail.next = null
37
        }  
38
    }  
39
   
40
//print all the nodes of doubly linked list  
41
    public void printNodes() {  
42
        //Node current will point to head  
43
        Node current = head
44
        if(head == null) {  
45
            System.out.println(Doubly linked list is empty);  
46
            return
47
        }  
48
        System.out.println(Nodes of doubly linked list: );  
49
        while(current != null) {  
50
            //Print each node and then go to next.  
51
            System.out.print(current.item +  );  
52
            current = current.next
53
        }  
54
    }  
55
}
56
class Main{
57
    public static void main(String[] args) {  
58
        //create a DoublyLinkedList object
59
        DoublyLinkedList dl_List = new DoublyLinkedList();  
60
        //Add nodes to the list  
61
        dl_List.addNode(10);  
62
        dl_List.addNode(20);  
63
        dl_List.addNode(30);  
64
        dl_List.addNode(40);  
65
        dl_List.addNode(50);  
66
   
67
        //print the nodes of DoublyLinkedList  
68
        dl_List.printNodes();  
69
    }  
70

How to how to format a datetime object to show date and time and milliseconds in java (Java Programming Language)

#Answer#

Mala Kaleb answered


1
public String getCurrentTimeStamp() {
2
    return new SimpleDateFormat(yyyy-MM-dd HH:mm:ss.SSS).format(new Date());
3
}

How to how to scan Integer in Java (Java Programming Language)

#Answer#

Olleras Bap answered


1
import java.util.*;
2
public class HowToScan {
3
   public static void main( String args[] ) 
4
   {
5
      Scanner S = new Scanner(System.in);
6
      int a;
7
      int b;
8
      int sum;
9
        a = S.nextInt();
10
        b = S.nextInt();
11
            sum = a + b;
12
        System.out.println( a + + + b  + = + sum );
13
   }
14
}

How to upper en java (Java Programming Language)

#Answer#

Akshat kcvicong answered


1
public class Guru99 {   
2
    public static void main(String args[]) {       
3
        String S1 = new String(minúsculas convertidas en mayúsculas);       
4
 
5
        // Convertir a UpperCase    
6
        System.out.println(S1.toUpperCase());   
7
    }
8
}

How to Java program bubble sort in ascending and descending order (Java Programming Language)

#Answer#

Sunder Dhanrajgir answered


1
// Bubble sort descending order
2
import java.util.Scanner;
3
public class BubbleSortDescending 
4
{
5
   public static void main(String[] args) 
6
   {
7
      int number, a, b, temp;
8
      Scanner sc = new Scanner(System.in);
9
      System.out.println(Please enter number of integers: );
10
      number = sc.nextInt();
11
      int[] arrInput = new int[number];
12
      System.out.println(Enter  + number +  integers: );
13
      for(a = 0; a < number; a++) 
14
         arrInput[a] = sc.nextInt();
15
      for(a = 0; a < (number - 1); a++) 
16
      {
17
         for(b = 0; b < number - a - 1; b++) 
18
         {
19
            // logic to sort in descending order
20
            if(arrInput[b] < arrInput[b + 1]) 
21
            {
22
               temp = arrInput[b];
23
               arrInput[b] = arrInput[b + 1];
24
               arrInput[b + 1] = temp;
25
            }
26
         }
27
      }
28
      sc.close();
29
      System.out.println(Sorted integers: );
30
      for(a = 0; a < number; a++) 
31
         System.out.println(arrInput[a]);
32
   }
33
}

How to Polymorphisim (Java Programming Language)

#Answer#

Sudheer qzlho Anil answered


1
Polymorphism means objects behave in different forms. 
2
 It occurs when parent class/interface 
3
calls to child class' objects 
4
Sub class can never be the reference type of Super Class Object
5
 The reference of an object decides what is accessible.
6
 Abstract class and interface are meant to be reference type,
7
CAN NEVER BE IN OBJECT TYPE
8
Static polymorphism. Ex: method overloading.  
9
Dynamic polymorphism Ex: method overriding 
10
EXAMPLE: WebDriver driver = new ChromeDriver(); 
11
driver.get()-> chrome, firefox
12
we are initializing Chrome browser using 
13
Selenium WebDriver. It also means we are creating 
14
a reference variable (driver) of the interface (WebDriver) 
15
and creating an Object (from ChromeDriver class). 
16
I am using Polymorphism In my framework in Driver Class. 
17
By making return type WebDriver I will be able to return 
18
ChromeDriverObject and FireFoxDriverObject. That’s how I achieve 
19
multi browser testing.
20
Reference type decides what can be called or accessed
21
WebDriver driver = getDriver();
22
getDriver() ==> chrome, firefox, ...
23
        
24
List<WebElement> list = new ArrayList<>();
25
List being reference to ArrayList. List is a super type of ArrayList. 
26
Map being reference to HasMap. Set is being reference to HashSet.

How to How to sort a string array in java (Java Programming Language)

#Answer#

lbtt Kashif answered


1
// java program to sort an array using Arrays.sort() method
2
import java.util.Arrays;
3
public class JavaArraySortMethod
4
{
5
   public static void main(String[] args)
6
   {
7
      String[] strGiven = {Great Barrier Reef, Paris, borabora, Florence,tokyo, Cusco};
8
      Arrays.sort(strGiven);
9
      System.out.println(Output(case sensitive) :  + Arrays.toString(strGiven));
10
   }
11
}

How to TreeSet higher() method in java (Java Programming Language)

#Answer#

Fashion Zara answered


1
TreeSet higher() method for ClassCastException.
2
import java.util.ArrayList;
3
import java.util.LinkedList;
4
import java.util.List;
5
import java.util.TreeSet;
6
public class TreeSetHigherMethodExample
7
{
8
   public static void main(String[] args)
9
   {
10
      TreeSet<List> ts = new TreeSet<List>();
11
      List<Integer> li1 = new LinkedList<Integer>();
12
      try
13
      {
14
         li1.add(2);
15
         li1.add(4);
16
         ts.add(li1);
17
         List<Integer> li2 = new LinkedList<Integer>();
18
         li2.add(6);
19
         li2.add(8);
20
         List<Integer> li3 = new ArrayList<Integer>();
21
         li2.add(10);
22
         li2.add(12);
23
      }
24
      catch(Exception ex)
25
      {
26
         System.out.println(ex);
27
      }
28
   }
29
}

How to android java log (Java Programming Language)

#Answer#

Anu theatre. answered


1
Button: Log.i(Info, Example of info (like Button Pressed));
2
Plain Text: Log.i(Username, usernameEditText.getText().toString());

How to convert date to datetime java (Java Programming Language)

#Answer#

Tapasranjan Sachdev answered


1
Fixed it using this:
2
public DateTime dateAndTimeToDateTime(java.sql.Date date, java.sql.Time time) {
3
    String myDate = date +   + time;
4
    SimpleDateFormat sdf = new SimpleDateFormat(yyyy-MM-dd HH:mm:ss);
5
    java.util.Date utilDate = new java.util.Date();
6
    try {
7
        utilDate = sdf.parse(myDate);
8
    } catch (ParseException pe){
9
        pe.printStackTrace();
10
    }
11
    DateTime dateTime = new DateTime(utilDate);
12
    return dateTime;
13
}

How to android navigation bar color change (Java Programming Language)

#Answer#

Devdarsh Bandi answered


1
<item name=android:navigationBarColor>@color/theme_color</item>

How to create constant class in java (Java Programming Language)

#Answer#

Kartike pzvp answered


1
public final class MyValues {
2
  public static final String VALUE1 = foo;
3
  public static final String VALUE2 = bar;
4
}

How to javafx drawing (Java Programming Language)

#Answer#

Anitav Shaw answered


1
import javafx.application.Application; 
2
import javafx.scene.Group; 
3
import javafx.scene.Scene; 
4
import javafx.stage.Stage; 
5
import javafx.scene.shape.LineTo; 
6
import javafx.scene.shape.MoveTo; 
7
import javafx.scene.shape.Path; 
8
         
9
public class ComplexShape extends Application { 
10
   @Override 
11
   public void start(Stage stage) { 
12
      //Creating a Path 
13
      Path path = new Path(); 
14
       
15
      //Moving to the starting point 
16
      MoveTo moveTo = new MoveTo(108, 71); 
17
        
18
      //Creating 1st line 
19
      LineTo line1 = new LineTo(321, 161);  
20
       
21
      //Creating 2nd line 
22
      LineTo line2 = new LineTo(126,232);       
23
       
24
      //Creating 3rd line 
25
      LineTo line3 = new LineTo(232,52);  
26
       
27
      //Creating 4th line 
28
      LineTo line4 = new LineTo(269, 250);   
29
       
30
      //Creating 4th line 
31
      LineTo line5 = new LineTo(108, 71);  
32
       
33
      //Adding all the elements to the path 
34
      path.getElements().add(moveTo); 
35
      path.getElements().addAll(line1, line2, line3, line4, line5);        
36
         
37
      //Creating a Group object  
38
      Group root = new Group(path); 
39
         
40
      //Creating a scene object 
41
      Scene scene = new Scene(root, 600, 300);  
42
      
43
      //Setting title to the Stage 
44
      stage.setTitle(Drawing an arc through a path);
45
      
46
      //Adding scene to the stage 
47
      stage.setScene(scene);
48
      
49
      //Displaying the contents of the stage 
50
      stage.show();         
51
   } 
52
   public static void main(String args[]){ 
53
      launch(args); 
54
   } 
55
}       

How to char array in java (Java Programming Language)

#Answer#

Raghunath George answered


1
char[] JavaCharArray = new char[5];
2
JavaCharArray[0] = 'r';
3
JavaCharArray[1] = 's';
4
JavaCharArray[2] = 't';
5
JavaCharArray[3] = 'u';

How to java filter array by even numbers (Java Programming Language)

#Answer#

R.G. Ordeix answered


1
function even(t) {
2
    return t.filter(function(x){ return x % 2 == 0; });
3
}

How to prime in java (Java Programming Language)

#Answer#

M zvjzb Malik answered


1
public class Prime {
2
    public static void main(String[] args) {
3
        int num = 29;
4
        boolean flag = false;
5
        for(int i = 2; i <= num/2; ++i){
6
            if(num % i == 0){
7
                flag = true;
8
                break;
9
            }
10
        }
11
        if (!flag)
12
            System.out.println(num +  is a prime number.);
13
        else
14
            System.out.println(num +  is not a prime number.);
15
}}
16
Source:www.progra

How to show confirmation dialog java android (Java Programming Language)

#Answer#

Pratiksha Booker answered


1
public void onDeleteClick(View v) {
2
    int i = Integer.parseInt((String)v.getTag());
3
    AlertDialog.Builder alert = new AlertDialog.Builder(AddressListActivity.this);
4
    alert.setTitle(Delete);
5
    alert.setMessage(Are you sure you want to delete?);
6
    alert.setPositiveButton(Yes, new DialogInterface.OnClickListener() {
7
        @Override
8
        public void onClick(DialogInterface dialog, int which) {
9
            Address address = _list.get(_currentPage*PANELS_PER_PAGE + i);
10
            _dbAdapter.deleteAddress(address.Id);
11
            _GetAddresses();
12
            dialog.dismiss();
13
        }
14
    });
15
    alert.setNegativeButton(No, new DialogInterface.OnClickListener() {
16
        @Override
17
        public void onClick(DialogInterface dialog, int which) {
18
                dialog.dismiss();
19
        }
20
    });
21
    alert.show();
22
}

How to hashtable in java (Java Programming Language)

#Answer#

Create ymtqrsu answered


1
- HashTable don't have null key, sychronized(thread-safe)
2
  Good for parallel testing

How to how to get individual words from a string in java (Java Programming Language)

#Answer#

Smarty Point answered


1
{
2
public static void main(String args[])
3
{
4
String str = Hey this is Ram;
5
String [] words = str. split( , 3);
6
for (String word : words)
7
System. out. println(word);

How to turning a sentence to an array java (Java Programming Language)

#Answer#

Sirsha Gautami answered


1
String s = "This is a sample sentence.";
2
String[] words = s.split("\\s+");
3
for (int i = 0; i < words.length; i++) {
4
    // You may want to check for a non-word character before blindly
5
    // performing a replacement
6
    // It may also be necessary to adjust the character class
7
    words[i] = words[i].replaceAll("[^\\w]", "");
8
}

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