Frame应用：打开电脑内的文件夹

最新推荐文章于 2025-09-25 08:43:12 发布

原创最新推荐文章于 2025-09-25 08:43:12 发布 · 515 阅读

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本文介绍如何使用Java语言和Swing库创建GUI应用程序，包括窗口布局、组件添加、事件监听等核心概念。

package collection;

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

public class Demo4{

/**
* @练习
*
*/

private Frame f;
private TextField tf;
private Button but;
private TextArea ta;

private Dialog d;
private Label lab;
private Button okBut;

Demo4(){
  init();
}
public void init(){
  f = new Frame("MyWindow");
  f.setBounds(300, 100, 600, 500);
  f.setLayout(new FlowLayout());//流布局

  tf = new TextField(29);

  but = new Button("change to:");

  ta = new TextArea(25,40);

  d = new Dialog(f,"information_self",true);
  d.setBounds(400, 200, 250, 100);
  d.setLayout(new FlowLayout());
  lab = new Label();
  okBut = new Button("Yes");

  d.add(lab);
  d.add(okBut);

  f.add(tf);
  f.add(but);
  f.add(ta);

  myEvent();

  f.setVisible(true);
}

private void myEvent(){

  tf.addKeyListener(new KeyAdapter(){

   public void keyPressed(KeyEvent e){
    if(e.getKeyCode()==KeyEvent.VK_ENTER)
     showDir();
   }

  });

  okBut.addActionListener(new ActionListener(){

   @Override
   public void actionPerformed(ActionEvent e) {
    d.setVisible(false);
   }
  });

  d.addWindowListener(new WindowAdapter(){
   public void windowClosing(WindowEvent e){
    d.setVisible(false);
   }
  });

  but.addActionListener(new ActionListener(){

   @Override
   public void actionPerformed(ActionEvent e) {
    showDir();

   }
  });

  f.addWindowListener(new WindowAdapter(){
   public void windowClosing(WindowEvent e){
    System.exit(0);
   }
  });

}

private void showDir(){
  String dirPath = tf.getText();

  File dir = new File(dirPath);
  if(dir.exists() && dir.isDirectory()){
   ta.setText("");
   String[] names = dir.list();

   for(String name: names){
    ta.append(name+"\r\n");
   }
  }
  else{
   String info = "The input \" "+dirPath +" \" is wrong, please input again!";
   lab.setText(info);
   d.setVisible(true);

  }

  tf.setText("");
}

public static void main(String[] args) {
  new Demo4();
}

}