谁知道错在那里啊？
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import javax.microedition.media.*;

/**
*
* @author Admin
* @version
*/
public class PlayToneDemo extends MIDlet implements CommandListener{
private Display display;
Form form = new Form( "音调播放演示 ");
TextField tfNote = new TextField( "请输入音量（0-127） ", "49 ",3,
TextField.NUMERIC);
TextField tfDuration = new TextField( "请输入持续时间（毫秒） ", "1000 ",10,
TextField.NUMERIC);
Gauge gagVol = new Gauge( "请选择音量 ",true,100,80);
private Command cmdPlay = new Command( "播放 ",Command.OK,1);
private Command cmdExit = new Command( "退出 ",Command.STOP,1);
public void PlayToneDemo(){
gagVol.setLayout(Item.LAYOUT_EXPAND);
form.append(tfNote);
form.append(tfDuration);
form.append(gagVol);
form.addCommand(cmdPlay);
form.addCommand(cmdExit);
form.setCommandListener(this);
}
public void commandAction(Command c,Displayable d){
String label = c.getLabel();
if (label.equals( "退出 ")){
this.notifyDestroyed();
}
if (label.equals( "播放 ")){
int note = Integer.parseInt(this.tfNote.getString());
if ((note> =0)&&(note <=127)){
int duration = Integer.parseInt(this.tfDuration.getString());
int vol = this.gagVol.getValue();
try{
javax.microedition.media.Manager.playTone(note,duration,vol);

}catch (exception e){
System.out.println( "播放声调发生异常： " + e.toString());
}
}
public void startApp() {

Display.getDisplay(this).setCurrent(form);
PlayToneDemo();


}

public void pauseApp() {
}

public void destroyApp(boolean unconditional) {
this.notifyDestroyed();
}
}
}
}
C:\Documents and Settings\Admin\MobileApplication1\src\PlayToneDemo.java:53: 非法的表达式开始
public void startApp() {
C:\Documents and Settings\Admin\MobileApplication1\src\PlayToneDemo.java:68: 需要为 class 或 interface
}
2 错误
C:\Documents and Settings\Admin\MobileApplication1\nbproject\build-impl.xml:183: Compile failed; see the compiler error output for details.
生成失败（总时间：2 秒）


[解决办法]
public void PlayToneDemo()
构造函数不需返回类型．
[解决办法]
废话,startApp()pauseApp()destroyApp(boolean unconditional)都没了,你的程序入口出口在哪??

[解决办法]
方法没有正确结束，缺｝：

public class PlayToneDemo extends MIDlet implements CommandListener{
private Display display;
Form form = new Form( "音调播放演示 ");
TextField tfNote = new TextField( "请输入音量（0-127） ", "49 ",3,
TextField.NUMERIC);
TextField tfDuration = new TextField( "请输入持续时间（毫秒） ", "1000 ",10,
TextField.NUMERIC);
Gauge gagVol = new Gauge( "请选择音量 ",true,100,80);
private Command cmdPlay = new Command( "播放 ",Command.OK,1);
private Command cmdExit = new Command( "退出 ",Command.STOP,1);
public void PlayToneDemo(){
gagVol.setLayout(Item.LAYOUT_EXPAND);
form.append(tfNote);
form.append(tfDuration);
form.append(gagVol);
form.addCommand(cmdPlay);
form.addCommand(cmdExit);
form.setCommandListener(this);
}
public void commandAction(Command c,Displayable d){
String label = c.getLabel();
if (label.equals( "退出 ")){
this.notifyDestroyed();
}
if (label.equals( "播放 ")){
int note = Integer.parseInt(this.tfNote.getString());
if ((note> =0)&&(note <=127)){
int duration = Integer.parseInt(this.tfDuration.getString());
int vol = this.gagVol.getValue();
try{
javax.microedition.media.Manager.playTone(note,duration,vol);


}catch (exception e){
System.out.println( "播放声调发生异常： " + e.toString());
}
}
}}
public void startApp() {

Display.getDisplay(this).setCurrent(form);
PlayToneDemo();
}

public void pauseApp() {
}

public void destroyApp(boolean unconditional) {
this.notifyDestroyed();
}
}
[解决办法]
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