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滚动条问题```急```

摘要: 滚动条问题```急```

import java.awt.*;
import java.awt.event.*;
import java.io.File;

public class Ex17_3 extends Frame{
TextField tf=new TextField();
Label lb=new Label("Path :");
List ls=new List(300);
Panel p=new Panel();
ScrollPane sp=new ScrollPane(0);
File f;
public Ex17_3(String title){
super(title);
lb.setBounds(10,25,50,30);
tf.setBounds(50,30,440,20);
sp.setBounds(10,60,480,400);
p.setLayout(new GridLayout(100,1));
p.add(ls);
sp.add(p);
add(sp);
add(tf);
add(lb);
WindowListener clo=new WindowAdapter(){
public void windowClosing(WindowEvent e){
dispose();
}
};
addWindowListener(clo);
tf.addTextListener(new Ofield());
}
class Ofield implements TextListener{
public void textValueChanged(TextEvent e){
try{
String p_text=tf.getText();
f=new File(p_text);
File[] fs=f.listFiles();
ls.setBackground(Color.YELLOW);
for(int i=0;i if(fs[i].isDirectory()){
ls.add("目录："+fs[i]);
}
else{
ls.add("文件："+fs[i]);
}
}
Thread.sleep(1000);
}
catch(Exception ttt){}
}
}
public static void main(String[] args){
Ex17_3 ob=new Ex17_3("简单文件浏览器");
ob.setBounds(300,230,500,470);
ob.setLayout(null);
ob.setVisible(true);
}
}


这个文件浏览器的滚动条很不好使用，不知道怎么改，请各位帮帮忙``谢谢

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修改意见如下:
程序有小错误,再第二次输入时应清除第一次的.ok
import java.awt.*;
import java.awt.event.*;
import java.io.File;

public class Ex17_3 extends Frame{
TextField tf=new TextField();
Label lb=new Label("Path :");
List ls=new List();
Panel p=new Panel();
ScrollPane sp=new ScrollPane();
File f;
boolean first=false;
public Ex17_3(String title){
super(title);
lb.setBounds(10,25,50,30);
tf.setBounds(50,30,440,20);
sp.setBounds(10,60,480,400);
//p.setLayout(new GridLayout(100,1));
//p.add(ls);
//sp.add(p);
sp.add(ls);
add(sp);
add(tf);
add(lb);


WindowListener clo=new WindowAdapter(){
public void windowClosing(WindowEvent e){
dispose();
}
};
addWindowListener(clo);
tf.addTextListener(new Ofield());
}
class Ofield implements TextListener{
public void textValueChanged(TextEvent e){
try{

String p_text=tf.getText();
f=new File(p_text);
File[] fs=f.listFiles();
ls.setBackground(Color.YELLOW);
if(first==true) ls.clear();//clear the listitem which is the priority dir contain;
for(int i=0;i if(fs[i].isDirectory()){
ls.add("目录："+fs[i]);
}
else{
ls.add("文件："+fs[i]);
}
first=true;
}
Thread.sleep(1000);
}
catch(Exception ttt){}
}
}
public static void main(String[] args){
Ex17_3 ob=new Ex17_3("简单文件浏览器");
ob.setBounds(300,230,500,470);
ob.setLayout(null);
ob.setVisible(true);
}
}

---