What is the use of constructor in java?

Essentially, a constructor's primary job is to initialize a new object. Think of it as a setup routine. It's a special block of code, similar to a method, but it has the same name as the class. When you create an object using the new keyword, the constructor is automatically called. Its main purpose is to set initial values for the instance variables. This ensures your object is born in a consistent and usable state from the get-go.