Types

Abstract

class Human { protected int id; public void setID (int id) { this.id = id; } public abstract boolean isHappy (); public void print () { System.out.println(id + ", " + isHappy()); } } class Parent extends Human { public Parent (int id) { setID (id); } public boolean isHappy () { return false; } // overloading public boolean isHappy (int age) { if (age < 25) { return true; } else { return false; } } // overriding public void print () { System.out.printf("ID %d is %s\n", id, isHappy()); } } class Child extends Human { public Child (int id) { setID (id); } public boolean isHappy () { return true; } } CS333 Types Fall 2021 ‣ Java can allow one subclass extend from one super class, but it allows a class implement multiple interfaces.