Contoh Program Java

Java ini dibuat menggunakan Midlet degan output Pertambahan bola
Berikut adalah link yang dapat diambil untuk penjelasan coding dan cara pembuatannya untuk pemula
silahkan Download :)

http://www.4shared.com/rar/i0Fk9_Uo/Program_Java_MIDlet_Penambahan.html?


import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;

public class qwerty extends MIDlet
{
layar myLayar;

public qwerty ()
{
myLayar = new layar();
    }

public void startApp()
{
Display.getDisplay(this).setCurrent(myLayar);
}
public void destroyApp(boolean b) {notifyDestroyed();}
public void pauseApp(){}

}

class layar extends Canvas implements Runnable
{
int[] x, y;
int[] arahX, arahY;
int now;

public layar()
{
now = 0;
x = new int[5];
y = new int[5];
arahX = new int[5];
arahY = new int[5];

for (int i=0; i < 5; i++) {
x[i] = 0;
y[i] = 0;
arahY[i] = 0;
arahX[i] = 0;
}

Thread th = new Thread(this);
th.start();
}

public void paint(Graphics g)
{
g.setColor(0xffffff);
        g.fillRect(0, 0, getWidth(), getHeight());
        g.setColor(0x0000ff);      
       
        for (int i=0; i < 5; i++) {
       if (now == i) g.setColor(0x00ff00);
       else g.setColor(0x0000ff);
       g.fillRoundRect(x[i], y[i], 10, 10, 10, 10);
        }
    }
       
    public void run()
    {
   while (true)
   {
   for (int i=0; i < 5; i++) {
   x[i]+=arahX[i];  
   y[i]+=arahY[i];      
 
   if ((x[i] > getWidth()) || (x[i] < 0)) arahX[i] = -arahX[i];
   if ((y[i] > getHeight()) || (y[i] < 0)) arahY[i] = -arahY[i];
   }      
     
   try {
   Thread.sleep(20);
   } catch (Exception e){};
   repaint();
    }
    }
   
    public void keyPressed(int key) {
   switch(key) {
   case KEY_NUM5:
       now++;
       if (now > 4) now = 0;
    arahX[now] = 1;
    arahY[now] = 1;
    break;
   case KEY_NUM2:
       now++;
       if (now > 4) now = 0;
    arahX[now] = 0;
    arahY[now] = -1;
    break;
   case KEY_NUM4:
       now++;
       if (now > 4) now = 0;
    arahX[now] = -1;
    arahY[now] = 0;
    break;
   case KEY_NUM6:
       now++;
       if (now > 4) now = 0;
    arahX[now] = 1;
    arahY[now] = 0;
    break;
   case KEY_NUM8:
       now++;
       if (now > 4) now = 0;
    arahX[now] = 0;
    arahY[now] = 1;
    break;
   }
    }
}