Question: In this Java code that I have, can you show how to make these changes? Alter the car object to display its engines RPM using
In this Java code that I have, can you show how to make these changes?
Alter the car object to display its engines RPM using displayRPM().
Have car display its RPM as the last thing in startYourEngines()
Alter the Racetrack object to give each car a different number and a different color.
Code 1:
public class Car
{
private int number = 0;
private String color = "unknown";
Engine e = new Engine();
public int getNumber()
{
return number;
}
public void setNumber(int number)
{
this.number = number;
}
public String getColor()
{
return color;
}
public void setColor(String color)
{
this.color = color;
}
public void startYourEngine()
{
e.start();
System.out.println("VVrooooooooom!!");
}
}
#2
public class Engine
{
private int size = 1500;
private int cylinders = 4;
private int rpm = 0;
public int getSize()
{
return size;
}
public void setSize(int size)
{
this.size = size;
}
public int getCylinders()
{
return cylinders;
}
public void setCylinders(int cylinders)
{
this.cylinders = cylinders;
}
public int getRpm()
{
return rpm;
}
public void setRpm(int rpm)
{
if((this.rpm + rpm) < 0)
{
this.rpm = 0;
}
else
{
this.rpm = this.rpm + rpm;
}
}
public void start()
{
if(getRpm() > 0)
{
stop();
}
setRpm(800);
System.out.println("Engine has started");
}
public void stop()
{
setRpm(-getRpm());
System.out.println("Engine has Stopped");
}
public void changeSpeed(int r)
{
setRpm(r);
}
}
#3.
public class TestCar
{
public static void main(String[] args)
{
Car c = new Car();
System.out.println("Car in beginning condition:");
System.out.println(c.getNumber() + " " + c.getColor());
c.setNumber(15);
c.setColor("Red");
System.out.println(" Car in altered condition:");
System.out.println(c.getNumber() + " " + c.getColor());
c.startYourEngine();
}
}
#4
public class TestEngine
{
public static void main(String[] args)
{
Engine e = new Engine();
e.start();
System.out.println("RPM is now set to: " + e.getRpm());
e.start();
System.out.println("RPM is now set to: " + e.getRpm());
e.stop();
System.out.println("RPM is now set to: " + e.getRpm());
e.start();
e.changeSpeed(1000);
System.out.println("RPM is now set to: " + e.getRpm());
e.changeSpeed(-2000);
System.out.println("RPM is now set to: " + e.getRpm());
}
}
#5.
public class Racetrack
{
public static void main(String[] args)
{
Car[] cars = new Car[10];
for(int x = 0; x < 10; x++)
{
cars[x] = new Car();
}
System.out.println("Welcome to Race Day!!!!");
System.out.println("Today we have a race between 10 cars");
System.out.println("Drivers! Start your engines!! ");
for(int x = 0; x < 10; x++)
{
cars[x].startYourEngine();
}
}
}
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