C:Copy Constructor
class Student {
private String name;
private int age;
public Student(String name, int age) {
this.name = name;
this.age = age;
}
public Student(Student s) {
this.name = s.name;
this.age = s.age;
}
public void display() {
System.out.println("Name: " + this.name);
System.out.println("Age: " + this.age);
}
public static void main(String[] args) {
Student s = new Student("Shital", 21);
System.out.println("Displaying the original object:");
s.display();
System.out.println("Displaying the copied object:");
Student copiedStudent = new Student(s);
copiedStudent.display();
}
}
Output :
C:\Users\HP\Desktop\Akash>javac Student.java
C:\Users\HP\Desktop\Akash>java Student
Displaying the original object
Name: Akash
Age: 21
Displaying the copied object
Name: Akash
Age: 21
C:\Users\HP\Desktop\Akash>
Practical No: 6
Date: / /
Q) Java Program Based on Inheritance.
1) Single Inheritance:
class Student{ void Fee(){
System.out.println("Student fees=25000");
}
}
class Student_Name extends Student{ void Name(){
System.out.println("Student Name=Shridhar");
}
}
class College{ public static void main(String args[]){
Student_Name p=new Student_Name();
p.Fee();
p.Name();
}}
Output :
C:\Users\HP\Desktop\Akash>javac College.java
C:\Users\HP\Desktop\Akash>java College
Student fees = 25000
2)Multilevel Inheritance:
class Car{ public Car(){
System.out.println("Class Car");
}
public void vehicleType(){
System.out.println("Vehicle Type:Car");
}
}
class Maruti extends Car{ public Maruti(){
System.out.println("Class Maruti");
}
public void brand(){
System.out.println("Brand:Maruti");
}
public void speed(){
System.out.println("Max:90Kmph");
}
}
public class Maruti800 extends Maruti{ public Maruti800(){
System.out.println("Maruti Model:800");
}
public void speed(){
System.out.println("Max:80Kmph");
}
public static void main(String args[]){ Maruti800 obj=new
Maruti800();
obj.vehicleType();
obj.brand();
obj.speed();
}
}
Output :
C:\Users\HP\Desktop\Akash>javac Maruti800.java
C:\Users\HP\Desktop\Akash>java Maruti800
Class Car
Class Maruti
Maruti Model: 800
Vehicle Type: Car
Brand: Maruti
Max: 80Kmph
C:\Users\HP\Desktop\Akash>
3)Hierachical Inheritance:
class Company{ public void CompanyName(){
System.out.println("Company name is Tech Mahindra.");
class Employee1 extends Company{ public void EmployeeName1(){
System.out.println("EmployeeName1 is Maher.");
class Employee2 extends Company{ public void EmployeeName2(){
System.out.println("EmployeeName2 is Azba.");
public class Main1{
public static voidmain(String []args){ Employee1 e1=new
Employee1();
e1.CompanyName();
e1.EmployeeName1();
Employee2 e2=new Employee2();
e2.CompanyName();
e2.EmployeeName2();
}
}
Output :
C:\Users\HP\Desktop\Akash>javac Multiple.java
C:\Users\HP\Desktop\Akash >java Multiple
Hi....I am Akash
I am Student of BCA 3rd year
C:\Users\HP\Desktop\Akash >
4)Multiple Inheritance:
interface A{
public abstract void execute1();
}
interface B{
public abstract void execute2();
}
class C implements A,B
{
public void execute1()
{
System.out.println("Hi....I am Mdgous");
}
public void execute2()
{
System.out.println("I am Student of BCA 3rd year");
}
}
public class Multiple{
public static void main(String args[]){ C obj=new C();
obj.execute1();
obj.execute2();
}}
Output :
C:\Users\HP\Desktop\Akash>javac Multiple.java
C:\Users\HP\Desktop\Akash>java Multiple
Hi....I am Akash
I am Student of BCA 3rd year
C:\Users\HP\Desktop\Akash>
5)Hybrids Inheritance:
interface Animal{
void sound();
}
interface Mammal{
void feed();
}
class Dog{ public void bark(){
System.out.println("Dog barks");
}
}
class Labrador extends Dog implements Animal,Mammal
{ public void sound(){
System.out.println("Labrador makes sound");
}
public void feed(){
System.out.println("Labrador feeds its puppies");
}
}
public class Main3{
public static void main(String args[]){ Labrador lab=new Labrador();
lab.bark();
lab.sound();
lab.feed();
}
}
Output :
C:\Users\HP\Desktop\Akash>javac Main3.java
C:\Users\HP\Desktop\Akash>JavaMain3
Dog barks
Labrador makes sound
Labrador feeds its puppies
C:\Users\HP\Desktop\Akash>
Practical No:7
Date: / /
Q) java programs based on method overloading.
class Calculator{ public int add(int x,int y){
return x+y;
}
public int add(int x,int y,int z){
return x+y+z;
}
public double add(double x,double y){ return x+y;
}
public String add(String x,String y){ return x+y;
}
public static void main(String args[]){
Calculator cal=new Calculator();
System.out.println("Sum of 10 & 20 is:"+cal.add(10,20));
System.out.println("Sum of 10,20 & 30:"+cal.add(10,20,30));
System.out.println("Sum of 10.5 & 20.5:"+cal.add(10.5,20.5));
System.out.println("Concatenation of Hello and World
is:"+cal.add("Hello","World"));
}
}
Output :
C:\Users\HP\Desktop\Akash>javac Calculator.java
C:\Users\HP\Desktop\Akash>java Calculator
Sum of 10 & 20 is: 30
Sum of 10, 20 & 30: 60
Sum of 10.5 & 20.5: 31.0
Concatenation of Hello and World is: HelloWorld
C:\Users\HP\Desktop\Akash>
Practical No:8
Date: / /
Q) Java Program based on method overriding.
class Animal
{
public void makeSound()
{
System.out.println("Animal makes a sound");
}
}
class Dog extends Animal
{
public void makeSound()
{
System.out.println("Dog barks");
}
}
class Cat extends Animal{
public void makeSound()
{
System.out.println("Cat meows");
}
}
public class Overriding
{
public static void main(String args[]){
Animal animal1=new Animal();
Animal animal2=new Dog();
Animal animal3=new Cat();
animal1.makeSound();
animal2.makeSound();
animal3.makeSound();
}
}
Output :
C:\Users\HP\Desktop\Akash>javac Overriding.java
C:\Users\HP\Desktop\Akash >java Overriding
Animal makes a sound
Dog barks
Cat meows
C:\Users\HP\Desktop\Akash >
Practical No:9
Date: / /
Q) java Program based on interface.
interface Walkable{ void walk();
}
interface Swimmable{ void swim();
}
class Duck implements Walkable,Swimmable{
public void walk(){
System.out.println("Duck is Walking.");
}
public void swim(){
System.out.println("Duck is Swimming.");
}
}
class Main{
public static void main(String args[]){ Duck duck=new Duck();
duck.walk();
duck.swim();
}
}
Output :
C:\Users\HP\Desktop\Akash>javac Main.java
C:\Users\HP\Desktop\Akash >java Main
Duck is Walking.
Duck is Swimming.
C:\Users\HP\Desktop\Akash>
2. Multiple interface
// Define Printable interface
interface Printable {
void print();
}
// Define Editable interface
interface Editable {
void edit();
}
// Class Document implements both Printable and Editable interfaces
class Document implements Printable, Editable {
public void print() {
System.out.println("Printing a document...");
}
public void edit() {
System.out.println("Editing a document...");
}
}
// Main class
class P2 {
public static void main(String[] args) {
Document document = new Document(); // Create an instance
of Document
document.print(); // Call print method
document.edit(); // Call edit method
}
}
Output :
C:\Users\HP\Desktop\Akash>javac P2.java
C:\Users\HP\Desktop\Akash>java P2
Printing a document...
Editing a document...
C:\Users\HP\Desktop\Akash >
Practical No: 10
Date: / /
Q. Java program based on packages .
Built-in package program
import java.lang.*;
import java.util.Scanner;
class Built1 {
public static void main(String args[]) {
Scanner sc = new Scanner(System.in);
// Calculate area of a circle
System.out.println("Enter radius: ");
double r = sc.nextDouble();
double ar = Math.PI * Math.pow(r, 2);
System.out.println("Area: " + ar);
// Get length of a string
String message = "hello, world!";
int length = message.length();
System.out.println("Length: " + length);
// Convert an integer to binary
int number = 42;
String binary = Integer.toBinaryString(number);
System.out.println("Binary: " + binary);
// Calculate hypotenuse
System.out.println("Enter the length of side a: ");
double a = sc.nextDouble();
System.out.println("Enter the length of side b: ");
double b = sc.nextDouble();
double c = Math.sqrt(Math.pow(a, 2) + Math.pow(b, 2));
System.out.println("The length of the hypotenuse (c) is: " + c);
sc.close(); // Close the scanner to prevent resource leak
}
}
Output :
C:\Users\HP\Desktop\Akash>javac Built1.java
C:\Users\HP\Desktop\Akash >java Built1
Enter radius:
5
Area: 78.53981633974483
Length: 13
Binary: 101010
Enter the length of side a:
3
Enter the length of side b:
4
The length of the hypotenuse (c) is: 5.0
C:\Users\HP\Desktop\shridhar >
User defined package program
mypackage.java
package piyush;
public class mypackage {
public void myfunction() {
System.out.println("Hello from Myclass!");
}
}
demon.java
import piyush.*;
class demon {
public static void main(String args[]) {
mypackage mm = new mypackage(); // Create an instance of
mypackage
mm.myfunction(); // Call the myfunction method
}
}
Output :
C:\Users\HP\Desktop\Akash\piyush>javac mypackage.java
C:\Users\HP\Desktop\Akash>javac demon.java
C:\Users\HP\Desktop\Akash>java demon
Hello from Myclass!
C:\Users\HP\Desktop\Akash >
Practical No:11
Date: / /
Q11) Java programs based on multithreading.
1]By extending Thread class
// Program demonstrating multithreading by extending the Thread
class
class Demo extends Thread {
public void run() {
for (int i = 1; i <= 100; i++) {
System.out.println("Shivraj College");
}
}
}
class Data extends Thread {
public void run() {
for (int i = 1; i <= 100; i++) {
System.out.println("BCA Department");
}
}
}
class Dept extends Thread {
public void run() {
for (int i = 1; i <= 100; i++) {
System.out.println("Hello BCA Students");
}
}
}
public class College1 {
public static void main(String[] args) {
Demo d1 = new Demo();
Data d2 = new Data();
Dept d3 = new Dept();
d1.start();
d2.start();
d3.start();
}
}
Output :
C:\Users\HP\Desktop\Akash>javac College1.java
C:\Users\HP\Desktop\Akash>java College1
Shivraj College
BCA Department
Hello BCA Students
Shivraj College
Hello BCA Students
BCA Department
Shivraj College
Shivraj College
2.By implementing Runnable interface
class A implements Runnable {
public void run() {
for (int i = 1; i <= 15; i++) {
System.out.println("Accelerate");
}
}
}
class B implements Runnable {
public void run() {
for (int j = 1; j <= 10; j++) {
System.out.println("Brake");
}
}
}
class C implements Runnable {
public void run() {
for (int k = 1; k <= 5; k++) {
System.out.println("Turbo");
}
}
}
class Mustang {
public static void main(String args[]) {
Thread t1 = new Thread(new A());
Thread t2 = new Thread(new B());
Thread t3 = new Thread(new C());
t1.start();
t2.start();
t3.start();
}
}
Output :
C:\Users\HP\Desktop\Akash>javac Mustang.java
C:\Users\HP\Desktop\Akash >java Mustang
Accelerate
Brake
Turbo
Accelerate
Brake
Turbo
Accelerate
Accelerate
Brake
Turbo
Accelerate
Brake
Turbo
3. Copy constructor
class Copy {
String name;
int id;
// Parameterized constructor
Copy(String name, int id) {
this.name = name;
this.id = id;
}
// Copy constructor
Copy(Copy obj2) {
this.name = obj2.name;
this.id = obj2.id;
}
}
class Cp {
public static void main(String args[]) {
// Creating an object using the parameterized constructor
Copy aa = new Copy("Zaid", 22);
System.out.println("Name: " + aa.name + " and ID: " + aa.id);
System.out.println();
// Creating a copy of the object using the copy constructor
Copy bb = new Copy(aa);
System.out.println("Name: " + bb.name + " and ID: " + bb.id);
}
}
Output :
C:\Users\HP\Desktop\CopyExample>javac Cp.java
C:\Users\HP\Desktop\CopyExample>java Cp
Name: Akash and ID: 22
Name: Akash and ID: 22
Practical No:12
Date: / /
Q. Java program based on exception handling .
Built-in exception
class BuiltEx {
public static void main(String[] args) {
try {
String str = null; // This will cause a NullPointerException
System.out.println(str.length()); // Attempting to access the
length of a null string
} catch (NullPointerException e) {
System.out.println("Caught the exception"); // This message
will be printed
System.out.println(e.getMessage()); // This will print null since
there's no message
}
}
}
Output :
C:\Users\HP\Desktop\ExceptionExample>javac BuiltEx.java
C:\Users\HP\Desktop\ExceptionExample>java BuiltEx
Caught the exception
null
2. User-defined
exception Code
class SimpleException extends Exception {
public SimpleException(String message) {
super(message);
}
}
class SimpleClass {
public void doSomething(int value) throws SimpleException {
if (value < 0) {
throw new SimpleException("Value cannot be negative.");
}
System.out.println("Value is: " + value);
}
}
class Main {
public static void main(String[] args) {
try {
SimpleClass simple = new SimpleClass();
simple.doSomething(-5); // This will throw an exception
} catch (SimpleException e) {
System.out.println("Caught SimpleException: " +
e.getMessage());
}
}
}
Output :
C:\Users\HP\Desktop\ExceptionExample>javac Main.java
C:\Users\HP\Desktop\ExceptionExample>java Main
Caught SimpleException: Value cannot be negative.
