Answer to Question #126866 in Java | JSP | JSF for Mario

Question

Give examples showing how "super" and "this" are useful with inheritance in Java. Include examples of using "super" and "this" both as constructors and as variables.

Answer 1

package com.sadkoala.test;

public class ClassA {

    protected int a;

    public ClassA(int a) {
        this.a = a;
    }

    public void printFields() {
        System.out.println("field a=" + a);
    }
    
}

package com.sadkoala.test;

public class ClassB extends ClassA {

    protected int b;
    protected int c;

    public ClassB(int a, int b, int c) {
        this(a, b);
        this.c = c;
    }

    public ClassB(int a, int b) {
        super(a);
        this.b = b;
    }

    public void printFields() {
        super.printFields();
        System.out.println("Field b=" + b);
        System.out.println("Field c=" + c);
    }

}