Top Java OOP Programs with Output | Class Variable, Encapsulation, Employee Salary, Basic Java Programs

Chapter 2: Programs 

Question 1: WAP to add two integers by using class variable.

Solution: 

class AddNumbers {
    static int num1 = 10;
    static int num2 = 20;
    static int sum;

    public static void main(String[] args) {
        sum=num1+num2;
        System.out.println("Sum= "+sum);
    }
}
Output: 30

<>

Question 2: WAP to subtract a float number from an integer number and get the result in integer by using local variable.

Solution: 

class Subtract {
    public static void main(String[] args) {
        // Local variables
        int num1 = 20;
        float num2 = 5.5f;
        
        // Subtraction and type casting to integer
        int result = (int)(num1 - num2);
        
        // Output
        System.out.println("Result = " + result);
    }
}
Output: 14

Question 3: WAP to print your name by creating an object.

Solution: 

class MyName {
    // Method to print name
    void display() {
        System.out.println("My name is Java Programming");
    }

    public static void main(String[] args) {
        // Object creation
        MyName obj = new MyName();
        
        // Method call
        obj.display();
    }
}
Output: My name is Java Programming

Question 4: WAP in Java with two private instance variable and create two different functions to get and set the value of those variables. Create the object of that class and show the use of those two functions to get and set the value in main function.

Solution: 

class Student {
    // Private instance variables
    private int id;
    private String name;

    // Setter methods (set value)
    public void setData(int i,String name) {
        id = i;
        this.name=name;
    }

    // Getter methods (get value)
    public void getData() {
        System.out.println("Id: "+id);
        System.out.println("Name: "+name);
    }
    public static void main(String[] args) {
        // Object creation
        Student s = new Student();

        // Setting values using setter
        s.setData(101,"Computer");
        s.getData();
    }
}
Output: Id: 101
              Name: Computer

Question 5: WAP with an "Employee" class having two variables one for the name of employee (String) and other for base salary(float). Create a function that calculate the total salary by adding 50% HRA to the salary and returns. Create an object of the class in main function and set the name of the employee, call the salary function and print the calculated salary returned by the function with name of the employee.

Solution: 

import java.util.Scanner;

class Employee {
    String name;
    float baseSalary;

    // Function to calculate total salary
    float calculateSalary() {
        float hra = 0.5f * baseSalary;
        return baseSalary + hra;
}
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        // Object creation
        Employee emp = new Employee();

        // Taking input
        System.out.print("Enter Employee Name: ");
        emp.name = sc.nextLine();

        System.out.print("Enter Base Salary: ");
        emp.baseSalary = sc.nextFloat();

        // Function call
        float total = emp.calculateSalary();

        // Output
        System.out.println("\nEmployee Name: " + emp.name);
        System.out.println("Total Salary (with 50% HRA): " + total);

        sc.close();
    }
}
Input: Enter Employee Name: Java
           Enter Base Salary: 20000
Output: Employee name: Java
              Total Salary (with 50% HRA): 30000.0

Question 6: Define a class with following members: 

    Data Members: 

        Integer type num1

        Floating point num2

        Double num3

    Functions(just outline):
        getData():        takes no argument and has int return value

        calc():              takes double argument and return a double

        sum():             takes two int arguments and returns an int type 

Solution: 

import class MyClass {
    // Data Members
    int num1;
    float num2;
    double num3;

    // Function: getData()
    int getData() {
        return 0;
    }

    // Function: calc()
    double calc(double x) {
           return 0.0;
    }

    // Function: sum()
    int sum(int a, int b) {
        return 0;
    }
}

Read also:

👉Chapter- 1: Important Java Programs for Beginners

👉Chapter- 3:User define Methods

👉Syllabus 2026-27