帮我看下为什么过滤器实现不了？

[abang8114]

import java.awt.Button;
import java.awt.FileDialog;
import java.awt.FlowLayout;
import java.awt.Frame;
import java.awt.event.*;
import java.io.File;


public class Myfiledialog implements ActionListener{
private Frame frame;
private FileDialog f1,f2;
private Button button1,button2;
private MyFilter myfilter;
private File[] files;
private String fpath;
private String fname;



public void f1(){
frame=new Frame("打开保存对话框");
button1=new Button("打开");
button2=new Button("保存");
button1.addActionListener(this);
button2.addActionListener(this);
frame.setLayout(new FlowLayout());
frame.setBounds(100, 100, 200, 200);
frame.add(button1);
frame.add(button2);
f1=new FileDialog(frame, "打开文件", FileDialog.LOAD);
f2=new FileDialog(frame,"保存文件",FileDialog.SAVE);
myfilter=new MyFilter();
f1.setFilenameFilter(myfilter);
f2.setFilenameFilter(myfilter);
frame.setVisible(true);
frame.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
System.exit(0);
}
});


}


public static void main(String[] args) {

new Myfiledialog().f1();


}

public void actionPerformed(ActionEvent e) {
String s=e.getActionCommand();

if (s.equals("打开")){

f1.setVisible(true);


}
else if(s.equals("保存"))
f2.setVisible(true);

}

}



import java.io.File;
import java.io.FilenameFilter;

public class MyFilter implements FilenameFilter{
private String[] extension;
public MyFilter(){
extension = new String[]{".jpg"};
}
public MyFilter(String[] extension){
this.extension = extension;
}
public boolean accept(File dir,String name){
for(String s : extension){
if(name.endsWith(s)){
return true;
}
}
return false;
}
}

[abang8114]

哪位大哥帮看看呀

[justinavril]

你也给大伙说说拟出什么问题了啊...

[abang8114]

打开文件的时候只想显示.jpg格式的文件，可实现不了呀！！！