Software Engineering Ontology Annotation 

Bycycle 

Source: http://jcs.mobile-utopia.com/jcs/2737_Bicycle.java

 

import java.awt.*;

import java.awt.event.*;

import java.applet.*;

 

 

public class Bicycle extends Applet implements ActionListener

{

  public Button Pedal = new Button("Pedal");

  public Button GearUp = new Button("+");

  public Button GearDown = new Button("-");

 

  int pos=0;

  Bike MyBike = new Bike(); //make a bike object

 

  //Initialize the applet

  public void init()

  {//set up the interface

    resize(600,60);

    add(Pedal);

    add(GearUp);

    add(GearDown);

    Pedal.addActionListener(this);

    GearUp.addActionListener(this);

    GearDown.addActionListener(this);

  }

 

  public void paint(Graphics g)

  {

    //let's make the bike move

    //first get its position

    MyBike.processBike(); //update the bike

    pos = MyBike.position/10;  //yuk, direct access to member data

    //finally let's draw the bike       ok it's doesn't look great, so make it better

 

    g.fillOval(pos,50,10,10);

    g.fillOval(pos+25,50,10,10);

    g.drawLine(pos+5,55,pos+30,55);

    g.drawLine(pos+30,55,pos+22,35);

     showStatus("xBike pos = "+MyBike.position+" Gear = "+MyBike.gear+" speed = " +MyBike.speed);

   repaint();

  } //end paint

 

  //handle the interface

  public void actionPerformed(ActionEvent ae)

  {

    if(ae.getSource()==Pedal)

      MyBike.pedal();

 

    if(ae.getSource()==GearUp)

      MyBike.gear++; //agh more tweaking with internal data gearUp();

 

    if(ae.getSource()==GearDown)

      MyBike.gear--;  //horrible, what happens if I get gear -1!?

  }

 

  //the DEFINITION of the CLASS Bike (we make an object called MyBike on line 20

  public class Bike

  {

    //member data

    private final int maxGear=3;

    public int speed=0;

    public int gear=1;

    public int position;

    private int count=0;

    //interface functions

    public void pedal()

    {

      speed+=gear;// = (speed *gear)+1;

      if (speed >200) speed = 200; //keep the speed to a sensible value by ensuring it doesn't go over 200

    }

 

    //called to continually update the position of the bike

    public void processBike()

    {

     count++;

     if (count>10)

     {

      speed=speed-1;

      count=0;

     }

      if (speed<0) speed=0;

      position = (position + speed);

      if(position>6000)

        position=0;  //10x because we div it by 10 to slow it down

    }

    //PUT YOUR NEW METHODS IN HERE

    //START BY WRITING ONE FOR THE BIKE'S POSITION AND DON@T FORGET TO CHANGE

    //THE LINE IN PAINT WHERE ITS VALUE IS USED

 

  }

  //Get parameter info

 

}//end applet