constructor in java

constructor in java

Ex:

public class A { public A(){ System.out.println("A"); } public A(int i){ this(); System.out.println(i); } } public class B extends A{ public B (){ System.out.println("B"); } public B (int i){ this(); System.out.println(i+3); } } public class Test{ public static void main (String[] args){ new B(5); } } output is: A B 8

HOW???

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