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ã€€ã€€æ¸…å• 1. HelloWorld.java
  
  /**
   * HelloWorld.java
   *
   * @author WanHui
   */
  import javax.microedition.lcdui.Display;
  import javax.microedition.lcdui.TextBox;
  import javax.microedition.midlet.MIDlet;
  public class HelloWorld extends MIDlet {
   private TextBox textbox;
   /**
   * Constructor of the HelloWorld class
   */
   public HelloWorld() {
   textbox = new TextBox("", "Hello World!", 20, 0);
   }
   /*
   * The startApp method is used for starting or restarting a MIDlet.
   *
   * @see javax.microedition.midlet.MIDlet#startApp()
   */
   public void startApp() {
   Display.getDisplay(this).setCurrent(textbox);
   }
   /*
   * The pauseApp method is called by the system to ask a MIDlet to "pause"
   *
   * @see javax.microedition.midlet.MIDlet#pauseApp()
   */
   public void pauseApp() {
   }
   /*
   * The destroyApp method is called by the system when the MIDlet is about to
   * be destroyed
   *
   * @see javax.microedition.midlet.MIDlet#destroyApp(boolean)
   */
   public void destroyApp(boolean unconditional) {
   }
  }
  
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