Java多线程解决龟兔赛跑问题详解-编程学习网

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

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;


public class RaceFrame extends JFrame {

    
    private static final long serialVersionUID = 4941729012450153307L;
    private JPanel contentPane;
    private JTextArea rabbitTextArea;
    private JTextArea tortoiseTextArea;

    
    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();
                }
            }
        });
    }

    
    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");
                }
            }

        }

    }
}