What does “this()” method mean?

Question

I ran into this block of code, and there is this one line I don\'t quit understand the meaning or what it is doing.

public Digraph(In in) {
    this(in.readI         


        

Answer 1

It's nearly the same

public class Test {
    public Test(int i) { /*construct*/ }

    public Test(int i, String s){ this(i);  /*construct*/ }

}

Answer 2

Constructor Overloading:

ex:

public class Test{

    Test(){
        this(10);  // calling constructor with one parameter 
        System.out.println("This is Default Constructor");
    }

    Test(int number1){
        this(10,20);   // calling constructor with two parameter
        System.out.println("This is Parametrized Constructor with one argument "+number1);
    }

    Test(int number1,int number2){
        System.out.println("This is Parametrized  Constructor  with two argument"+number1+" , "+number2);
    }


    public static void main(String args[]){
        Test t = new Test();
        // first default constructor,then constructor with 1 parameter , then constructor with 2 parameters will be called 
    }

}