[ITCENTER] Setting Up PATH Java

[//de2[at]here]

Guy's....mau tanya nih....Sebelumnya sorry banget tanya2 masalah program JAVA

Saya lagi coba2 prgoram JAVA dengan nama coba.JAVA dan sudah setting PATH di 
'Environment Variables'

Variable Name : PATH
Variable Value : C:\j2sdk1.4.2_04\bin

Untuk compile di command prompt nya

C:\javac coba.java

terus balik ke C:\

Untuk runningnya.

C:\java coba
Tapi selalu tampli message error:
Execption in thread "main" java.lang.NoClassDefFoundError: coba

Terus dicoba dengan 

C:\java coba.java
Tapi selalu tampli message error:
Execption in thread "main" java.lang.NoClassDefFoundError: coba/java

Kira2 kenapa ya........?

Berikut codingnya....

Namef File :    coba.JAVA

import javax.swing.*;
import java.awt.*;

class grap1 extends Canvas
{
 public void paint (Graphics bendera)
 {
  bendera.setColor(Color.RED);
  bendera.fillRect(50,30,200,50);
  bendera.setColor(Color.WHITE);
  bendera.fillRect(50,80,200,50);
  bendera.setColor(Color.BLUE);
  bendera.fillOval(40,27,10,10);
  bendera.fillRect(40,30,10,150);

  bendera.setColor(Color.YELLOW);
  bendera.setFont(new Font("Tahoma",Font.BOLD,20));
  bendera.drawString("MERDEKA",100,150);

  bendera.setColor(Color.GREEN);
  bendera.setFont(new Font("ARIAL",Font.BOLD,10));
  bendera.drawString("17 Agustus 1945 - 2004",90,170);

 }
}

class grap11 extends JFrame
{
 private Container konten=new Container();
 private grap1 goni=new grap1();
 grap11()
 {
  super("Coba");
  setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  this.setLocation(100,100);
  this.setSize(300,250);
  konten=getContentPane();
  konten.add(goni);

  show();
 }

 public static void main(String args[])
 {
  new grap11();
 }
}

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