补发《超级迷宫》站立会议八

 这天，课程较多，只在晚上搜了一段代码，进行学习，收集的代码如下：

  

import java.awt.FlowLayout; 

import java.awt.Font; 

import java.awt.event.ActionEvent; 

import java.awt.event.ActionListener; 

  

import javax.swing.JButton; 

import javax.swing.JFrame; 

import javax.swing.JLabel; 

public class Pragram { 

    static int seconds = 150; 

    private TimeThread tt = null; 

    private boolean ttFlag = false; 

      

    private void init() { 

        final JLabel tip = new JLabel(); 

        final JButton start = new JButton("开始"); 

        final JButton end = new JButton("结束"); 

        JFrame f = new JFrame(); 

        f.setLayout(new FlowLayout(5)); 

        f.add(tip); 

        f.add(start); 

        f.add(end); 

        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 

        f.setVisible(true); 

        f.setSize(300, 150); 

        f.setLocationRelativeTo(null); 

          

        start.addActionListener(new ActionListener() { 

              

            @Override 

            public void actionPerformed(ActionEvent e) { 

                start.setEnabled(false); 

                tip.setFont(new Font("宋体",Font.BOLD,27)); 

                ttFlag = true; 

                tt = new TimeThread(tip); 

                tt.start(); 

            } 

        }); 

        end.addActionListener(new ActionListener() { 

              

            @Override 

            public void actionPerformed(ActionEvent e) { 

                start.setEnabled(true); 

                tip.setText(""); 

                Pragram.seconds = 150; 

                ttFlag = false; 

            } 

        }); 

    } 

    /** 

     * @param args 

     */ 

    public static void main(String[] args) { 

        new Pragram().init(); 

    } 

      

    class TimeThread extends Thread { 

        private JLabel tip; 

        TimeThread(JLabel tip) { 

            this.tip = tip; 

        } 

        @Override 

        public void run() { 

            int seconds = Pragram.seconds; 

            tip.setText(seconds+""); 

              

            while (seconds-- > 0 && ttFlag) { 

                tip.setText(seconds+""); 

                try { 

                    Thread.sleep(1000); 

                } catch (InterruptedException e) { 

                    e.printStackTrace(); 

                } 

            } 

        } 

    }; 

}

 实现结果如下：

如图所示，实现了倒计时。