多线程4（龟兔赛跑-休眠线程）
1.题目
在龟兔赛跑中，领先的兔子因为通宵写博客，中途太累睡着了，跑输了乌龟。这个故事说明了兔子是爱学习的同学。咳咳，通宵是不可取的，大家别学。
实现：使用线程休眠模拟龟兔赛跑比赛
2.解题思路
创建一个类：RaceFrame，继承了JFrame。用来界面显示两个文本区域，用来输出乌龟和兔子的比赛记录，比赛开始按钮用来开始比赛。
编写内部类：Rabbit,该类实现了Runnable接口，在run()方法中，让兔子休眠了时间。
Thread是程序中的执行线程。JAVA虚拟机允许应用程序并发地运行多个执行线程。
sleep()方法是Thread类的一个静态方法。
3.代码详解
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package com.xiaoxuzhu; import java.awt.BorderLayout; import java.awt.EventQueue;
import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.border.EmptyBorder; import javax.swing.JButton; import java.awt.GridLayout; import javax.swing.JLabel; import javax.swing.JScrollPane; import javax.swing.JTextArea; import javax.swing.SwingConstants; import java.awt.event.ActionListener; import java.awt.event.ActionEvent; import javax.swing.UIManager; import java.awt.Font; /** * Description: * * @author xiaoxuzhu * @version 1.0 * * <pre> * 修改记录: * 修改后版本 修改人 修改日期 修改内容 * 2022/5/11.1 xiaoxuzhu 2022/5/11 Create * </pre> * @date 2022/5/11 */
public class RaceFrame extends JFrame {
/** * */ private static final long serialVersionUID = 4941729012450153307L; private JPanel contentPane; private JTextArea rabbitTextArea; private JTextArea tortoiseTextArea;
/** * Launch the application. */ public static void main(String[] args) { try { UIManager.setLookAndFeel("com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel"); } catch (Throwable e) { e.printStackTrace(); } EventQueue.invokeLater(new Runnable() { public void run() { try { RaceFrame frame = new RaceFrame(); frame.setVisible(true); } catch (Exception e) { e.printStackTrace(); } } }); }
/** * Create the frame. */ public RaceFrame() { setTitle("休眠当前线程"); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setBounds(100, 100, 450, 300); contentPane = new JPanel(); contentPane.setBorder(new EmptyBorder(5, 5, 5, 5)); setContentPane(contentPane); contentPane.setLayout(new BorderLayout(0, 0));
JPanel buttonPanel = new JPanel(); contentPane.add(buttonPanel, BorderLayout.SOUTH);
JButton button = new JButton("比赛开始"); button.setFont(new Font("微软雅黑", Font.PLAIN, 16)); button.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { do_button_actionPerformed(arg0); } }); buttonPanel.add(button);
JPanel panel = new JPanel(); contentPane.add(panel, BorderLayout.CENTER); panel.setLayout(new GridLayout(1, 2, 5, 5));
JPanel rabbitPanel = new JPanel(); panel.add(rabbitPanel); rabbitPanel.setLayout(new BorderLayout(0, 0));
JLabel rabbitLabel = new JLabel("兔子的比赛记录"); rabbitLabel.setFont(new Font("微软雅黑", Font.PLAIN, 16)); rabbitLabel.setHorizontalAlignment(SwingConstants.CENTER); rabbitPanel.add(rabbitLabel, BorderLayout.NORTH);
JScrollPane rabbitScrollPane = new JScrollPane(); rabbitPanel.add(rabbitScrollPane, BorderLayout.CENTER);
rabbitTextArea = new JTextArea(); rabbitTextArea.setFont(new Font("微软雅黑", Font.PLAIN, 16)); rabbitScrollPane.setViewportView(rabbitTextArea);
JPanel tortoisePanel = new JPanel(); panel.add(tortoisePanel); tortoisePanel.setLayout(new BorderLayout(0, 0));
JLabel tortoiseLabel = new JLabel("乌龟的比赛记录"); tortoiseLabel.setFont(new Font("微软雅黑", Font.PLAIN, 16)); tortoiseLabel.setHorizontalAlignment(SwingConstants.CENTER); tortoisePanel.add(tortoiseLabel, BorderLayout.NORTH);
JScrollPane tortoiseScrollPane = new JScrollPane(); tortoisePanel.add(tortoiseScrollPane, BorderLayout.CENTER);
tortoiseTextArea = new JTextArea(); tortoiseTextArea.setFont(new Font("微软雅黑", Font.PLAIN, 16)); tortoiseScrollPane.setViewportView(tortoiseTextArea); }
protected void do_button_actionPerformed(ActionEvent arg0) { Runnable run1 = new Rabbit(); Runnable run2 = new Tortoise(); Thread rabbit = new Thread(run1); Thread tortoise = new Thread(run2); rabbit.start(); tortoise.start(); }
private class Rabbit implements Runnable { @Override public void run() { for (int i = 1; i < 11; i++) {// 循环10次模拟赛跑的过程 String text = rabbitTextArea.getText();// 获得文本域中的信息 try { Thread.sleep(1);// 线程休眠0.001秒，模拟兔子在跑步 } catch (InterruptedException e) { e.printStackTrace(); } rabbitTextArea.setText(text + "兔子跑了" + i + "0米\n");// 显示兔子的跑步距离 if (i == 9) { rabbitTextArea.setText(text + "兔子在睡觉\n");// 当跑了90米时开始睡觉 try { Thread.sleep(10000);// 线程休眠10秒，模拟兔子在睡觉 } catch (InterruptedException e) { e.printStackTrace(); } } if (i == 10) { try { Thread.sleep(1);// 线程休眠0.001秒，模拟兔子在跑步 } catch (InterruptedException e) { e.printStackTrace(); } rabbitTextArea.setText(text + "兔子到达终点\n");// 显示兔子到达了终点 } } } }
private class Tortoise implements Runnable {
@Override public void run() { for (int i = 1; i < 11; i++) { String text = tortoiseTextArea.getText(); try { Thread.sleep(100); } catch (InterruptedException e) { e.printStackTrace(); } tortoiseTextArea.setText(text + "乌龟跑了" + i + "0米\n"); if (i == 10) { try { Thread.sleep(100); } catch (InterruptedException e) { e.printStackTrace(); } tortoiseTextArea.setText(text + "乌龟到达终点\n"); } }
}
} } |
