Define a class named Engine containing:
An instance variable named engineNo of type string, initialized to null.
A full parameterized contructor.
A method named getEngineNo that returns the value of engineNo.
A method named start that starts the engine via displaying the message "Start the car".
A method named rev that reverse the enginevia displaying the message "Reverse the engine".
A method named stop that stops the enginevia displaying the message "Car stopped".
Define another class named Car containing:
An instanc variable named name of type string, initialized to null.
An instance object named engine of type Engine
A full parameterized constructor.
A method named move that invokes the method start of the object engine for moving the car.
A method named goBack that invokes the method rev of the object engine for reversing the car
A method named stop that invokes the method stop of the object engine for stopping the car.
A method named display that prints all car's data (i.e. car name and engine number).
Define a third class named TestCar contains a main method that test the functionality of the above
classes.
Composition : using objects as attributes in new classes.
Java programming
public class TestCar
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public static void main(String[] args) {
Car ca=new Car("Lada","22352");
ca.display();
}
}
class Engine
{
String enginNo=null;
public Engine(String EngNo)
{
enginNo=EngNo;
}
public String getEngeneNo()
{
return enginNo;
}
public void Start()
{
System.out.println("Start the Car");
}
public void Reverse()
{
System.out.println("Reverse the engine");
}
public void Stop()
{
System.out.println("Car stopped");
}
}
class Car
{
String name=null;
Engine engine;
public Car(String Name,String Engno)
{
name=Name;
engine=new Engine(Engno);
}
public void move()
{
engine.Start();
}
public void goBack()
{
engine.Reverse();
}
public void Stop()
{
engine.Stop();
}
public void display()
{
System.out.println("Engine Num : "+engine.getEngeneNo()+" ,Car Name :"+this.name);
}
}