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Java Programming [ Lab Programs ]

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Aim:

Write a Java program to demonstrate the OOP principles. [i.e., Encapsulation, Inheritance, Polymorphism and Abstraction]

Source Code:

OopPrinciplesDemo.java

/* Encapsulation: 

   The fields of the class are private and accessed through getter and setter methods.*/

class Person {

    // private fields

    private String name;

    private int age;

    // constructor

    public Person(String name, int age) {

        this.name = name;

        this.age = age;

    }

    // getter and setter methods

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

    public int getAge() {

        return age;

    }

    public void setAge(int age) {

        this.age = age;

    }

    /* Abstraction: 

       The displayInfo() method provides a simple interface to interact with the object.*/

    public void displayInfo() {

        System.out.println("Name: " + name);

        System.out.println("Age: " + age);

    }

}



/* Inheritance: 

   Employee is a subclass of Person, inheriting its properties and methods.*/

class Employee extends Person {

    // private field

    private double salary;

    // constructor

    public Employee(String name, int age, double salary) {

        super(name, age);

        this.salary = salary;

    }

    // getter and setter methods

    public double getSalary() {

        return salary;

    }

    public void setSalary(double salary) {

        this.salary = salary;

    }



    /* Polymorphism:

       Overriding the displayInfo() method to provide a specific implementation for Employee.*/

    @Override

    public void displayInfo() {

        super.displayInfo();

        System.out.println("Salary: " + salary);

    }

}



public class OopPrinciplesDemo {

    public static void main(String[] args) {

        // Demonstrating encapsulation and abstraction

        Person person = new Person("Madhu", 30);

        System.out.println("Person Info:");

        person.displayInfo();

        System.out.println("====================");



        // Demonstrating inheritance and polymorphism

        Employee employee = new Employee("Naveen", 26, 50000);

        System.out.println("Employee Info:");

        employee.displayInfo();

    }

}

Output:

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Related Content :

Java Programming Lab Programs

1) Use eclipse or Netbean platform and acquaint with the various menus, create a test project, add a test class and run it see how you can use auto suggestions, auto fill. Try code formatter and code refactoring like renaming variables, methods and classes. Try debug step by step with a small program of about 10 to 15 lines which contains at least one if else condition and a for loop. View Solution

2) Write a Java program to demonstrate the OOP principles. [i.e., Encapsulation, Inheritance, Polymorphism and Abstraction] View Solution

3) Write a Java program to handle checked and unchecked exceptions. Also, demonstrate the usage of custom exceptions in real time scenario. View Solution

4) Write a Java program on Random Access File class to perform different read and write operations. View Solution

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9) Write a Java program that handles all mouse events and shows the event name at the center of the window when a mouse event is fired. [Use Adapter classes] View Solution

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