Program to implement multi-level inheritance.

CODE:

class Animal

{

void eat(){System.out.println("eating...");}

}

class Dog extends Animal

{

void bark(){System.out.println("barking...");}

}

class BabyDog extends Dog

{

void weep(){System.out.println("weeping...");}

}

class EXP18Q3

{

public static void main(String args[])

{

BabyDog d=new BabyDog();

d.weep();

d.bark();

d.eat();

}

OUTPUT:

Comments

Develop a program to accept a Password from the user and throw “Authentication Failure” exception if the password is incorrect

import java.util.*; class Test { public static void main(String args[]) { try { System.out.println("Enter Password: "); Scanner obj=new Scanner(System.in); String pass= obj.nextLine(); if(!pass.equals("1234")) System.out.println("Authentication Failure"); else System.out.println("Welcome....!!"); } catch (Exception e) { System.out.println(""); } finally { System.out.println("Thank You.........!!!!!"); ...

Program to calculate the room area and volume to illustrate the concept of single inheritance.

CODE: class Roomarea { protected double l, b; Roomarea(double len, double br) { l=len; b=br; } void putdata() { System.out.println("Area of Room: "+(l*b)); } } class Roomvol extends Roomarea { double h; Roomvol(double len, double br, double he) { super(len, br); h=he; } void putdata() { super.putdata(); System.out.println("Volume of Room: "+(l*b*h)); } } public class EXP18Q4 { public static void main(String[] args) { Roomvol r1 = new Roomvol(10, 20, 10); r1.putdata(); } }

Define a package named myInstitute include class named as Department with one method to display the staff of the department. Develop a program to import this package in a java application and call the method define in the package.

Code: package myInstitute; public class Department { public void display() { int sr=1; String Name="Ajay"; long no=987654321; String desig="H.O.D"; System.out.println("Details of Staff are"); System.out.println("Srno = "+sr); System.out.println("Name = "+Name); System.out.println("Designation = "+desig); System.out.println("Phone Number = "+no); } } import myInstitute.*; class JavaApplication { public static void main(String args[]) { Department obj = new Department(); obj.display(); } } Output:

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