The code defines three classes: bicycle, car, and bike, which...

December 8, 2023 at 02:38 AM

import java.util.*;

interface vehicle {		//vehicle interface
	void gear_change(int a);		
	void speed_up();
	void apply_brakes();
	void display();

}

//BICYCLE CLASS
class bicycle implements vehicle
{
	int gear,speed;

	bicycle()			//default constructor for bicycle
	{
		System.out.println("\tBicycle started successfully\n ");
		gear=1;			//gear is 1 when Cycle starts
		speed=10;		//speed is 10 when Cycle Starts
	}

	public void gear_change(int gearex)
	{
		if(gearex<7 && gearex>0)		//maximum gear for vehicle is 6
		{
			gear=gearex;
			System.out.println("\tGear changed Successfully \n\t Current Gear Is "+gear);
		}
		else
			System.out.println("Gear is Out Of Range \n");
	}

	public void speed_up()			
	{
		if((speed+5)<50 ) {		//50 as maximum speed
			speed+=5;
			System.out.println("\n\tBicycles speed increased \n\t current speed is "+speed);
		}
		else
			System.out.println("Speed Cannot Be Increased Above 50 Kmhr\n");
	}

	public void apply_brakes()		//function to apply brakes
	{
		Scanner sc=new Scanner(System.in);
		int x;
		System.out.println("1. DECREASE SPEED\n2. STOP BICYCLE\n");
		x=sc.nextInt();

		if(x==1)
			if((speed-5)>0)			// speed never be negative
			{
				speed-=5;			//per apply brakes bicycles speed is reduced by 5
				System.out.println("Speed Reduced Successfull \n\tCurrent speed is "+speed+" Kmhr \n");
			}
			else {
				speed=0;
				gear=0;
				System.out.println("Bicycle stopped Successfully\n ");}

		if(x==2)			//to stop bicycle 
		{
			speed=0;
			gear=0;
			System.out.println("Bicycle stopped Successfully\n ");
		}

	}

	public void display()		//displays current status of bicycle
	{
		System.out.println("YOUR  BICYCLE'S SPEED IS "+speed +" Kmhr AND GEAR IS "+gear);
	}
}





class car implements vehicle		
{
	int gear,speed;

	car()
	{
		System.out.println("\tCar started successfully\n ");
		gear=1;			//speed when car started
		speed=10;		//gear when car started
	}
	public void gear_change(int gearex)
	{
		if(gearex<7 && gearex >0)	//maximum gear is 6
		{
			this.gear=gearex;
			System.out.println("\tGear changed Successfully \n\t Current Gear is "+gear);
		}
		else
			System.out.print(" Gear Out Of Range \n");
	}

	public void speed_up()
	{

		if((speed+20)<150 )			//150 as maximum speed
		{
			speed+=20;
			System.out.println("Cars speed increased \n\t Current speed is "+speed+" Kmhr\n");
		}
		else
			System.out.println("Speed Cannot Be Increased Above 150 Kmhr\n");

	}

	public void apply_brakes()
	{
		Scanner sc=new Scanner(System.in);
		int x;
		System.out.println("1. TO DECREASE SPEED\n2. TO STOP CAR\n");
		x=sc.nextInt();
		if(x==1)
			if((speed-20)>0)		//checks speed is negative or positive if reduced by 20
			{
				speed-=20;			//per apply brakes vehicle speed is reduced by 20
				System.out.println("Speed Reduced Successfully \n\tCurrent Speed Is "+speed+" kmhr\n");
			}
			else {
				speed=0;
				gear=0;
				System.out.println("Car stopped Successfully\n ");}
		if(x==2)
		{
			speed=0;
			gear=0;
			System.out.println("Car stopped Successfully \n");
		}	
	}

	public void display()		//displays current status of car
	{
		System.out.println("YOUR  CAR'S SPEED IS "+speed +" Kmhr AND GEAR IS "+gear+"\n");
	}

}


//BIKE CLASS

class bike implements vehicle
{
	int gear,speed;		//data members of bike class

	bike()
	{
		System.out.println("\tBike started successfully \n");
		gear=1;		//initial gear when bike starts
		speed=10;	//initial speed of bike when starts
	}
	public void gear_change(int gearex)
	{
		if(gearex<6 && gearex>0)		//maximum gears is 5
		{
			gear=gearex;
			System.out.println("\tGear changed Successfully \n\t Current Gear IS "+gear);
		}
		else
			System.out.println("Gear out of range \n");
	}

	public void speed_up()
	{
		if((speed+20)<100 )		//maximum speed is 100 for bike
		{
			speed+=20;
			System.out.println("Bike's speed increased \n\t Current speed is "+speed+" Kmhr.\n");
		}
			else
				System.out.println("Speed Cannot Be Increased Above 100 Kmhr \n");

	}

	public void apply_brakes()			//method to reduce bike speed or stop bike
	{
		Scanner sc=new Scanner(System.in);
		int x;
		System.out.println("1. TO DECREASE SPEED\n2. TO STOP bike\n");
		x=sc.nextInt();
		if(x==1)
			if((speed-20)>0)	//checks speed is negative or positive if reduced by 20
			{
				speed-=20;			//per apply brakes vehicle speed is reduced by 20
				System.out.println("Speed Reduced Successfull   \n\tCurrent speed is "+speed+ "kmhr\n" );
			}
			else {
				speed=0;
				gear=0;
				System.out.println("Bike stopped Successfully \n");}
		if(x==2)
		{
			speed=0;
			gear=0;
			System.out.println("Bike stopped Successfully \n");
		}

	}

	public void display()		//displays current bike status
	{
		System.out.println("YOUR  BIKE'S SPEED IS "+speed +" Kmhr AND GEAR IS "+gear+"\n");
	}
}

//--------------------- Class Main ---------------------//
public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc=new Scanner(System.in);		

		vehicle v=null;			// vehicle interface reference created
		System.out.println("======================================================================");
		int y;			//variable to choose vehicle
		bb:		//label for do while loop
		do {
			System.out.print("  SELECT VEHICLE  \n\t1.BICYCLE \n\t2.CAR  \n\t3.BIKE \n\t4.Exit \nChoice::");
			 y=sc.nextInt();

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

			if(y==1)		
				v=new bicycle();	//object of bicycle class
			else if(y==2)
				v= new car();		//object of car class
			else if(y==3)
				v=new bike();		//object of bike class
			else if(y==4)
				break bb;			//label break
			else
				System.out.println("INVALID INPUT");
				System.out.println("======================================================================");

			if(0<y&&y<4) {
			aa:		//label for inner do while loop
				do {
					System.out.print(" \tPress 1. Speed Up \n\tPress 2. Change gear \n\tPress 3. Apply Brakes  "
						+ "\n\tPress 4. Display Vehicle Status \n\tPress 5. change Vehicle /Exit \nChoice::");
					int z=sc.nextInt();  		
					System.out.println("======================================================================");
				switch(z)
				{
				case 1:
					v.speed_up();
					System.out.println("======================================================================");
					break;
				case 2:
					System.out.print("which gear you want?   ");
					int a=sc.nextInt();
					v.gear_change(a);
					System.out.println("======================================================================");
					break;

				case 3:
					v.apply_brakes();
					System.out.println("======================================================================");
					break;
				case 4:
					v.display();
					System.out.println("======================================================================");
					break;
				case 5:
					break aa;		//label break
				default:
						System.out.println("Invalid Input");

				}
				}while(true);
			}



		}while(y!=4); //loop break when input y=4
	}

}

The code defines three classes: bicycle, car, and bike, which implement the vehicle interface.

The vehicle interface defines four methods: gear_change(), speed_up(), apply_brakes(), and display(). Each class implements these methods according to their specific behavior.

The main() method creates an instance of the vehicle interface and prompts the user to choose a vehicle (bicycle, car, or bike). Depending on the user's choice, the respective object is created and the user can perform actions such as speeding up, changing gear, applying brakes, and displaying the vehicle status. The program continues to prompt the user for actions until the user chooses to exit.

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