Practical - 1
A) Write java program to demonstrate Boolean value.
public class BooleanDemo {
    public static void main(String[] args) {
        int number1 = 5;
        int number2 = 10;
        boolean isLessThan = (number1 < number2);
 
        System.out.println("The value of number1 is: " + number1);
        System.out.println("The value of number2 is: " + number2);
        System.out.println("Is number1 less than number2? " + isLessThan); 
 
    }
}

Practical – 2
A) Write java program to find the biggest number among three numbers using if else.
public class Biggest{
	public static void main (String args[]){
	int a=25;
	int b=35;
	int c=15;
	if(a>=b && a>=c){
		System.out.println(a + " is the biggest number.");
	}else if(b>=a && b>=c){
		System.out.println(b + " is the biggest number.");
	}else{
		System.out.println(c + " is the biggest number.");
	}
      }
}
C) Write a java program to check grade of marks using a switch case.
public class Gradecheck{
public static void main (String args[]){
int marks=85;
switch(marks/10){
case 10:
System.out.println("Grade: O");
System.outprintln(“Remarks : Outstanding”);
break;
case 9:
System.out.println("Grade: A");
System.out.println("Remarks : Excellent");
break;
case 8:
System.out.println("Grade: B");
System.out.println("Remarks : Very Good");
break;
case 7:
System.out.println("Grade: C");
System.out.println("Remarks : Good");
break;
case 6:
System.out.println("Grade: D");
System.out.println("Remarks : Satisfactory");
break;
case 5:
System.out.println("Grade: E");
System.out.println("Remarks : Needs Improvement");
break;
default:
System.out.println("Grade: F");
System.out.println("Remarks : Fail - Better luck next time");
}
}
}

Practical – 3
B) Write java program to create a class and access all data members and methods using the object and compute area and perimeter of a circle.
public class Circle {
	double radius;
	void setRadius(double r){
		radius = r;
	}
	double area (){
		return 3.14* radius * raidus;}
	double permeter (){
		return 2* 3.14159 *radius;}
	public static void main (String args[]){
Circle obj = new Circle();
obj.setRadius(5.5);
System.out.println("Radius : "+ obj.radius());
System.out.println("Are of Circle : "+ obj.area());
System.out.println("Perimeter of Circle : "+ obj.perimeter());
}
}

Practical- 4 
B) Java program to demonstrate multilevel inheritance
class Shape {
    void displayShape() {
        System.out.println("This is a shape.");
    }
}
class Rectangle extends Shape {
    void displayRectangle() {
        System.out.println("This is a rectangle.");
    }
}
class Area extends Rectangle {
    int calculateArea(int length, int breadth) {
        return length * breadth;
    }
}
public class MultiInher{
    public static void main(String[] args) {
        Area rect = new Area();
        rect.displayShape();       
        rect.displayRectangle();     

        
        int result = rect.calculateArea(8, 4);
        System.out.println("Area of Rectangle: " + result);
    }
}

Practical -5
A) Java program demonstrsting hierarchical inheritance.
class Vehicle {
    void start() {
        System.out.println("Vehicle is starting...");
     }   
}
class Car extends Vehicle {
    void showCar() {
        System.out.println("This is a Car.");
    }
}
class Bike extends Vehicle {
    void showBike() {
        System.out.println("This is a Bike.");
    }
}
public class Main {
    public static void main(String[] args) {
        Car c = new Car();
        Bike b = new Bike();

        c.start();     
        c.showCar();   

        b.start();     
        b.showBike();   
    }
}




Practical - 6
B) Java Program to find average of three numbers using the method overloading.
class AverageCalc{
 void average(int a, int b, int c) {
        double avg = (a + b + c) / 3.0;
        System.out.println("Average of three integers: " + avg);
    }
    void average(double a, double b, double c) {
        double avg = (a + b + c) / 3.0;
        System.out.println("Average of three doubles: " + avg);
    }
}
public class AverageOverload {
    public static void main(String[] args) {
        AverageCalculator obj = new AverageCalculator();
 
        obj.average(10, 20, 30);        
        obj.average(5.5, 10.5, 15.5);  
    }
}
Practical -7
A). Write java program create an interface area, find the area of a circle.
import java.util.*;
interface Area {
    double calculateArea();
}
class Circle implements Area {
    double radius;
 
    Circle(double r) {
        radius = r;
    }
 
    public double calculateArea() {
        return 3.14 * radius * radius;
    }
}
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
 
        System.out.print("Enter radius of the circle: ");
        double r = sc.nextDouble();
 
        Circle c = new Circle(r);
        double area = c.calculateArea();
        System.out.println("Area of Circle = " + area);
    }
}
Practical 8
B) Write a program to demonstrate exception handling in case of variable or constant divided by zero .
class Error {
    public static void main(String args[]) {
        try {
            int denominator = 0;
            if (denominator != 0) {
                int a = 50 / denominator;
                System.out.println("Result: " + a);
            } else {
                System.out.println("Cannot divide by zero!");
            }
        } catch (ArithmeticException e) {
            System.out.println("Error: " + e.getMessage());
        }
    }
}

Practical 10
B) Java program to find factorial of number using user defined packages.
Step 1:-
package mypackage;
public class Factorial {
public int findFactorial(int n) {
        int fact = 1;
        for (int j = 1; j <= n; j++) {
            fact *= j;
        }
        return fact;
    }
}
Step 2:-
import mypackage.Factorial;
import java.util.Scanner;
class MainFactorial {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
  System.out.print("Enter a number: ");
  int num = sc.nextInt();
 Factorial f = new Factorial();
        int result = f.findFactorial(num);
 System.out.println("Factorial of " + num + " is: " + result);
 sc.close();
    }
}