import java.awt.*;import java.awt.event.*;import javax.swing.*;public class Gui01 implements ActionListener{ JButton btn; public static void main(String[] args) { Gui01 gui = new Gui01(); gui.go(); } public void go(){ //創(chuàng)建JFrame JFrame frame = new JFrame("my first Gui"); //創(chuàng)建按鈕 JButton btn = new JButton("click me"); //在window結(jié)束時(shí)，把程序結(jié)束 frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //為按鈕添加事件監(jiān)聽 btn.addActionListener(this); //把button添加到frame 的 pane上 frame.getContentPane().add(btn); //設(shè)置frame的大小 frame.setSize(500,500); //顯示frame frame.setVisible(true); } //此方法為事件響應(yīng)的回調(diào)函數(shù) public void actionPerformed(ActionEvent e){ System.out.println("hello world"); try{ btn.setText("i've been clicked."); }catch(Exception ex){ ex.printStackTrace(); } }}
為什么點(diǎn)擊按鈕的時(shí)候報(bào)錯(cuò)了
一個(gè)愛狗的男生
2016-12-08 19:52:13
