请大家帮小弟我看一下,编译时好像没有错,但是执行时却有一点有关问题

请大家帮我看一下,编译时好像没有错,但是执行时却有一点问题.
import   java.awt.*;
import   java.awt.event.*;

class   SimpleAwt   extends   WindowAdapter   implements   ActionListener
{
Frame   MyFrame;
Label   Source;
Label   Target;
Button   b1;
Button   b2;
Button   b3;
Panel   MyPanel;
TextField   TextField1;
TextField   TextField2;
public   static   void   main(String[]   args)
{

SimpleAwt   egSimpleAwt=new   SimpleAwt();
egSimpleAwt.go();

}
void   go()
{

MyFrame=new   Frame( "My   Frame ");
MyFrame.setSize(400,300);
MyPanel=new   Panel();

MyFrame.add(MyPanel, "center ");
Source=new   Label( "Source ");
Target=new   Label( "Target ");
b1=new   Button( "Clear ");
b2=new   Button( "Copy ");
b3=new   Button( "Close ");
TextField1=new   TextField(20);
TextField1.setEditable(true);

TextField2=new   TextField(20);
MyPanel.setLayout(new   FlowLayout(FlowLayout.CENTER,5,5));
MyPanel.add(Source);
MyPanel.add(TextField1);

MyPanel.add(Target);
MyPanel.add(TextField2);

MyPanel.add(b1);
MyPanel.add(b2);
MyPanel.add(b3);


b1.addActionListener(this);
b2.addActionListener(this);
b3.addActionListener(this);
MyFrame.setVisible(true);
}
public   void   actionPerformed(ActionEvent   e)
{
if(e.getActionCommand()== "Clear ")
{

TextField1.setText( " ");
}
if   (e.getActionCommand()== "Copy ")
{
String   str=TextField1.getText();
TextField2.setText(str);
}
if(e.getActionCommand()== "Close ")
{
System.exit(0);
}

}
public   void   WindowClosing(WindowEvent   e)
{
System.exit(0);
}










}


------解决方案--------------------
什么问题？
------解决方案--------------------
帮忙顶，楼主把问题说出来啊。你不说我们怎么知道呢。虽然我们知道你有问题，可是你还是要说出来啊。