[javaSE] GUI（练习-列出指定目录内容）详解编程语言

调用TextField对象的getText()方法，可以获取文本框内的数据

调用TextArea对象的setText()方法，设置文本数据

列目录

获取到文本框中的路径，包装成File对象

调用File对象的list()方法，可以得到String[]文件名数组

import java.awt.Button; 

import java.awt.FlowLayout; 

import java.awt.Frame; 

import java.awt.TextArea; 

import java.awt.TextField; 

import java.awt.event.ActionEvent; 

import java.awt.event.ActionListener; 

import java.awt.event.WindowAdapter; 

import java.awt.event.WindowEvent; 

import java.io.File; 

public class FrameDemo { 

 private Frame frame; 

 private TextField tf; 

 private TextArea ta; 

 private Button button; 

 public FrameDemo() { 

 init(); 

 /** 

 * 初始化 

 public void init() { 

 frame = new Frame("测试窗体"); 

 frame.setBounds(300, 200, 300, 400); 

 frame.setLayout(new FlowLayout()); 

 tf = new TextField(20); 

 button = new Button("转到"); 

 ta = new TextArea(30, 30); 

 frame.add(button); 

 frame.add(tf); 

 frame.add(ta); 

 frame.setVisible(true); 

 addEventAction(); 

 /** 

 * 添加事件 

 public void addEventAction() { 

 // 退出 

 frame.addWindowListener(new WindowAdapter() { 

 @Override 

 public void windowClosing(WindowEvent e) { 

 System.exit(0); 

 }); 

 // action事件 

 button.addActionListener(new ActionListener() { 

 @Override 

 public void actionPerformed(ActionEvent e) { 

 String dirName = tf.getText(); 

 File file = new File(dirName); 

 if (!file.isDirectory() || !file.exists()) { 

 ta.setText("目录不存在"); 

 return; 

 String[] files = file.list(); 

 StringBuilder sb = new StringBuilder(); 

 for (String name : files) { 

 sb.append(name); 

 sb.append("/r/n"); 

 ta.setText(sb.toString()); 

 }); 

 /** 

 * @param args 

 public static void main(String[] args) { 

 new FrameDemo(); 

}

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