Using this() with a Constructor

Question:

How to use the keyword this in a constructor?

Answer:

From within a constructor, you can also use the this keyword to call another constructor in the same class. Doing so is called an explicit constructor invocation.

Code:

public class MyClass {
 
  int a=0;
  int b=0;
 
  MyClass(){
    this(5,8);
  }
 
  MyClass(int a, int b){
    this.a = a;
    this.b = b;
  }
 
  public static void main(String[] args) {
    MyClass mc = new MyClass();
    System.out.println("mc.a: " + mc.a);
    System.out.println("mc.b: " + mc.b);
  }
 
}

Output:

$ java MyClass
mc.a: 5
mc.b: 8