Question

Write the java program in the following features of OOP:

1,Encapsulation

2,Polymorphism

3,Inheritance

4,Abstraction 

Answer 1

public abstract class Vehicle {
    private String color;

    public Vehicle(String color) {
        this.color = color;
    }

    public abstract void useHorn();
}

public class Car extends Vehicle {
    private String frontLicensePlate;
    private String rearLicensePlate;

    public Car(String color) {
        super(color);
    }

    @Override
    public void useHorn() {
        System.out.println("Bip-bip");
    }

    public void addLicensePlate(String frontLicensePlate, String rearLicensePlate) {
        this.frontLicensePlate = frontLicensePlate;
        this.rearLicensePlate = rearLicensePlate;
    }

    public void addLicensePlate(String licensePlate) {
        frontLicensePlate = licensePlate;
        rearLicensePlate = licensePlate;
    }
}