Lesson-5
public int add(int x, int y){
int sum = x + y;
return sum;
}
public static void main(String args[]){
Addition obj = new Addition();
int sum = obj.add(10, 20);
System.out.println(“The sum of 10 and 20 is ” + sum + “.”);
}}
- public class Student{
public String name;
public String dept;
public Student(){
this.name = “Andrea Williams”;
this.dept = “Computer Applications”; }
public static void main(String[] args){
Student obj = new Student();
System.out.println(“Name: ” + obj.name);
System.out.println(“Department: ” + obj.dept);
}}
- import java.io.*;
import java.util.*;
public class InstanceCounter{
private static int testValue = 0;
protected static int getCount(){
return testValue;
}
private static void addValue(){
testValue++;
}
InstanceCounter(){
InstanceCounter.addValue();
}
public static void main(String[] arguments){
Scanner in = new Scanner(System.in);
int a = in.nextInt();
for (int i = 0; i < a; ++i){
new InstanceCounter();
}
System.out.print(“Created ” + InstanceCounter.getCount() + ” instances”);
}}
Lesson-6
class ParentClass{
public void multiplication(int x, int y){
int product = x * y;
System.out.println(“The product of ” + x + ” and ” + y + ” is ” + product + “.”);
}
}
public class ChildClass extends ParentClass{
public static void main(String args[]){
int a = 20, b = 10;
ChildClass obj = new ChildClass();
obj.multiplication(a, b);
}
}
class Food{
Food(){
System.out.println(“Food is ready.”);
}
}
class Pasta extends Food{
Pasta(){
super();
System.out.println(“Pasta is ready.”);
}
}
public class Cuisine{
public static void main(String args[]){
Pasta p = new Pasta();
}
}
abstract class Animals{
abstract String getSound();
}
class Dog extends Animals{
String getSound(){
return “woof”;
}
}
class Horse extends Animals{
String getSound(){
return “neigh”;
}
}
public class Test{
public static void main(String args[]){
Animals a;
a = new Dog();
System.out.println(“The sound that a dog makes is called ” + a.getSound() + “.”);
a = new Horse();
System.out.println(“The sound that a horse makes is called ” + a.getSound() + “.”);
}
}
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