Q8.java

import java.io.*;
import java.util.*;
/*
// Single Inheritance
// Parent class
class Parent {
    void show() {
        System.out.println("This is the parent class");
    }
}

// Child class
class Child extends Parent {
    void display() {
        System.out.println("This is the child class");
    }
}

// Test class
public class Q8 {
    public static void main(String args[]) {
        Child c = new Child();
        c.show(); // calling method of parent class
        c.display(); // calling method of child class
    }
}

// Multilevel Inheritance
// Parent class
class Parent {
    void show() {
        System.out.println("This is the parent class");
    }
}

// Child class
class Child extends Parent {
    void display() {
        System.out.println("This is the child class");
    }
}

// Grandchild class
class GrandChild extends Child {
    void print() {
        System.out.println("This is the grandchild class");
    }
}

// Test class
public class Q8 {
    public static void main(String args[]) {
        GrandChild gc = new GrandChild();
        gc.show(); // calling method of parent class
        gc.display(); // calling method of child class
        gc.print(); // calling method of grandchild class
    }
}

// Hierarchical Inheritance
// Parent class
class Parent {
    void show() {
        System.out.println("This is the parent class");
    }
}

// First child class
class Child1 extends Parent {
    void display1() {
        System.out.println("This is the first child class");
    }
}

// Second child class
class Child2 extends Parent {
    void display2() {
        System.out.println("This is the second child class");
    }
}

// Test class
public class Q8 {
    public static void main(String args[]) {
        Child1 c1 = new Child1();
        c1.show(); // calling method of parent class
        c1.display1(); // calling method of first child class

        Child2 c2 = new Child2();
        c2.show(); // calling method of parent class
        c2.display2(); // calling method of second child class
    }
}

// Multiple Inheritance
// First Parent interface
interface Parent1 {
    void show1();
}

// Second Parent interface
interface Parent2 {
    void show2();
}

// Child class
class Child implements Parent1, Parent2 {
    public void show1() {
        System.out.println("This is the first parent class");
    }
    public void show2() {
        System.out.println("This is the second parent class");
    }
}

// Test class
public class Q8 {
    public static void main(String args[]) {
        Child c = new Child();
        c.show1(); // calling method of first parent class
        c.show2(); // calling method of second parent class
    }
}
*/