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Java实验五: Java多线程程序设计(头歌)

一、线程接力

编写一个应用程序,除了主线程外,还有三个线程:first、second和third。first负责模拟一个红色的按钮从坐标(10,60)运动到(100,60);second负责模拟一个绿色的按钮从坐标(100,60)运动到(200,60)。third线程负责模拟一个蓝色的按钮从坐标(200,60)运动到(300,60)。

第一步

以下是idea jdk1.8的教程 eclipse同理

新建一个MoveButton类
image

image

第二步:把代码覆盖粘上去

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
 
class MoveButton extends Frame implements Runnable, ActionListener {
	Thread first, second, third;    //用Thread类声明first,second,third三个线程对象
	Button redButton, greenButton, blueButton, startButton;     //声明四个按钮
	JLabel copyright;        //版权信息
	int distance = 10;
 
	MoveButton() {
		//分别创建first,second,third三个线程,用当前窗口做为该线程的目标对象.
		first = new Thread(this);
		second = new Thread(this);
		third = new Thread(this);
 
		redButton = new Button();
		greenButton = new Button();
		blueButton = new Button();
 
		redButton.setBackground(Color.red);
		greenButton.setBackground(Color.green);
		blueButton.setBackground(Color.blue);
 
		startButton = new Button("start");
		startButton.addActionListener(this);
		setLayout(null);
		add(redButton);
		copyright = new JLabel("xxxxxxx写自己的信息xxxxxxxx");
		add(copyright);
		redButton.setBounds(10, 60, 15, 15);
		add(greenButton);
		greenButton.setBounds(100, 60, 15, 15);
		add(blueButton);
		blueButton.setBounds(200, 60, 15, 15);
		add(startButton);
 
		startButton.setBounds(10, 100, 30, 30);
		copyright.setBounds(100, 100, 240, 30);
		setTitle("线程接力");
		setBounds(0, 0, 400, 200);
		setVisible(true);
		validate();
		addWindowListener(new WindowAdapter() {
			public void windowClosing(WindowEvent e) {
				System.exit(0);
			}
		});
	}
 
	@Override
	public void actionPerformed(ActionEvent e) {
		try {
			//分别启动三个线程
			first.start();
			second.start();
			third.start();
		} catch (Exception exp) {
		}
	}
 
	public void run() {
		while (true) {
			//判断当前占有CPU资源的线程是否是first
			if (Thread.currentThread() == first) {
				moveComponent(redButton);
				try {
					Thread.sleep(20);
				} catch (Exception exp) {
				}
			}
			//判断当前占有CPU资源的线程是否是second
			if (Thread.currentThread() == second) {
				moveComponent(greenButton);
				try {
					Thread.sleep(10);
				} catch (Exception exp) {
				}
			}
			//判断当前占有CPU资源的线程是否是third
			if (Thread.currentThread() == third) {
				moveComponent(blueButton);
				try {
					Thread.sleep(20);
				} catch (Exception e) {
				}
			}
		}
	}
 
	public synchronized void moveComponent(Component b) {
		if (Thread.currentThread() == first) {
			while (distance > 100 && distance <= 300)
				try {
					wait();
				} catch (Exception exp) {
				}
			distance = distance + 1;
			b.setLocation(distance, 60);
			if (distance >= 100) {
				b.setLocation(10, 60);
				notifyAll();
			}
		}
		if (Thread.currentThread() == second) {
			while (distance > 200 && distance <= 300)
				try {
					wait();
				} catch (Exception exp) {
				}
			distance = distance + 1;
			b.setLocation(distance, 60);
			if (distance > 200) {
				b.setLocation(100, 60);
				notifyAll();
			}
		}
		if (Thread.currentThread() == third) {
			while (distance > 300)
				try {
					wait();
				} catch (Exception exp) {
				}
			distance = distance + 1;
			b.setLocation(distance, 60);
			if (distance > 300) {
				distance = 10;
				b.setLocation(200, 60);
				notifyAll();
			}
		}
	}
 
	public static void main(String[] args) {
		new MoveButton().setLocationRelativeTo(null);
	}
}

第三步:更改自己的学生编号

image

二、线程的控制

编写一个程序,动画显示文本域中的字符串。在窗体的南面添加三个按钮,为程序添加线程控制功能,要求点击开始按钮(startBtn),线程开始启动,文字逐个显示,并且将按钮状态改变为禁用(因为线程不能重复启动);点击暂停按钮(pauseBtn),线程暂停,文字显示停止;点击恢复按钮(resumeBtn),线程恢复运行,文字继续显示。当线程执行完毕后,恢复开始按钮的状态为可用。

第一步:新键RunnableDemo类

image

第二步:把代码粘上去覆盖掉

import java.awt.*;
import javax.swing.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.border.BevelBorder;
public class RunnableDemo extends JFrame implements Runnable, ActionListener {
 
    private JTextArea textArea; //文本域组件
    JLabel label;
    JButton startBtn;
    JButton pauseBtn;
    JButton resumeBtn;
    Panel panel;
    Thread thread;
    boolean move = false;
 
    //动画显示的文本字符串
    private final String introduction = "现在大家已经对计算机很熟悉了,如今计算机的操作"
            + "系统可以同时执行多个任务,在听歌的同时能够打字、下载文件,在聊天窗口打"
            + "字的时候,对方同时还能通过视频看到你;听到你。这一切都是使用多任务实现"
            + "的,Java语言使用多线程实现一个程序中的多个任务同时运行。程序员可以在程"
            + "序中执行多个线程,每一个线程完成一个功能,并与其他线程并发执行,这种机"
            + "制被称为多线程。";
 
    public RunnableDemo() {
        setTitle("线程的控制");
        label = new JLabel("多线程简介:xxxxxxx写自己的信息xxxxxxxx");//标签组件
        getContentPane().add(label, BorderLayout.NORTH);            //添加标签到窗体
        textArea = new JTextArea("\t");                             //初始化文本域组件
        textArea.setBorder(new BevelBorder(BevelBorder.LOWERED));   //设置边框
        textArea.setLineWrap(true);                                 //设置自动折行
        getContentPane().add(textArea, BorderLayout.CENTER);        //添加文本域组件到文本框
        startBtn = new JButton("开始");
        pauseBtn = new JButton("暂停");
        resumeBtn = new JButton("恢复");
        startBtn.addActionListener(this);
        pauseBtn.addActionListener(this);
        resumeBtn.addActionListener(this);
        panel = new Panel();
        panel.add(startBtn);
        panel.add(pauseBtn);
        panel.add(resumeBtn);
        getContentPane().add(panel, BorderLayout.SOUTH);
        setBounds(0, 0, 383, 225); //设置窗体大小位置
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        setVisible(true); //显示窗体
    }
 
    @Override   //Runnable接口方法,是线程的执行方法.
    public void run() {
        textArea.setText("\t");
        String[] intros = introduction.split(""); //将字符串分割为数组
        for (String ch : intros) {//ForEach遍历字符串数组
            while (!move) {
                try {
                    synchronized (this) {
                        wait();
                    }
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
            textArea.append(ch); //添加一个字符到文本域
            try {
                Thread.sleep(100); //线程休眠0.1秒
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
        startBtn.setEnabled(true);
    }
 
    @Override
    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == startBtn) {
            thread = new Thread(this);
            thread.start();
            move = true;
        } else if (e.getSource() == pauseBtn) {
            move = false;
        } else if (e.getSource() == resumeBtn) {
            move = true;
            synchronized (this){
                notifyAll();
            }
        }
    }
 
    public static void main(String[] args) {
        new RunnableDemo().setLocationRelativeTo(null); //创建本类实例对象
    }
}

第三步:更改自己的学生编号

image

提交应采用markdown语法提交

实验目的

1.掌握Runnable接口实现多线程的方法
2.掌握Thread类实现多线程的用法
3.掌握Java语言中多线程编程的基本方法

实验代码

1. 线程接力

package Clier;
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
 
class MoveButton extends Frame implements Runnable, ActionListener {
	Thread first, second, third;    //用Thread类声明first,second,third三个线程对象
	Button redButton, greenButton, blueButton, startButton;     //声明四个按钮
	JLabel copyright;        //版权信息
	int distance = 10;
 
	MoveButton() {
		//分别创建first,second,third三个线程,用当前窗口做为该线程的目标对象.
		first = new Thread(this);
		second = new Thread(this);
		third = new Thread(this);
 
		redButton = new Button();
		greenButton = new Button();
		blueButton = new Button();
 
		redButton.setBackground(Color.red);
		greenButton.setBackground(Color.green);
		blueButton.setBackground(Color.blue);
 
		startButton = new Button("start");
		startButton.addActionListener(this);
		setLayout(null);
		add(redButton);
		copyright = new JLabel("KZ计算机218 文涵 2021961523");
		add(copyright);
		redButton.setBounds(10, 60, 15, 15);
		add(greenButton);
		greenButton.setBounds(100, 60, 15, 15);
		add(blueButton);
		blueButton.setBounds(200, 60, 15, 15);
		add(startButton);
 
		startButton.setBounds(10, 100, 30, 30);
		copyright.setBounds(100, 100, 240, 30);
		setTitle("线程接力");
		setBounds(0, 0, 400, 200);
		setVisible(true);
		validate();
		addWindowListener(new WindowAdapter() {
			public void windowClosing(WindowEvent e) {
				System.exit(0);
			}
		});
	}
 
	@Override
	public void actionPerformed(ActionEvent e) {
		try {
			//分别启动三个线程
			first.start();
			second.start();
			third.start();
		} catch (Exception exp) {
		}
	}
 
	public void run() {
		while (true) {
			//判断当前占有CPU资源的线程是否是first
			if (Thread.currentThread() == first) {
				moveComponent(redButton);
				try {
					Thread.sleep(20);
				} catch (Exception exp) {
				}
			}
			//判断当前占有CPU资源的线程是否是second
			if (Thread.currentThread() == second) {
				moveComponent(greenButton);
				try {
					Thread.sleep(10);
				} catch (Exception exp) {
				}
			}
			//判断当前占有CPU资源的线程是否是third
			if (Thread.currentThread() == third) {
				moveComponent(blueButton);
				try {
					Thread.sleep(20);
				} catch (Exception e) {
				}
			}
		}
	}
 
	public synchronized void moveComponent(Component b) {
		if (Thread.currentThread() == first) {
			while (distance > 100 && distance <= 300)
				try {
					wait();
				} catch (Exception exp) {
				}
			distance = distance + 1;
			b.setLocation(distance, 60);
			if (distance >= 100) {
				b.setLocation(10, 60);
				notifyAll();
			}
		}
		if (Thread.currentThread() == second) {
			while (distance > 200 && distance <= 300)
				try {
					wait();
				} catch (Exception exp) {
				}
			distance = distance + 1;
			b.setLocation(distance, 60);
			if (distance > 200) {
				b.setLocation(100, 60);
				notifyAll();
			}
		}
		if (Thread.currentThread() == third) {
			while (distance > 300)
				try {
					wait();
				} catch (Exception exp) {
				}
			distance = distance + 1;
			b.setLocation(distance, 60);
			if (distance > 300) {
				distance = 10;
				b.setLocation(200, 60);
				notifyAll();
			}
		}
	}
 
	public static void main(String[] args) {
		new MoveButton().setLocationRelativeTo(null);
	}
}

2. 线程的控制

package Clier;
import java.awt.*;
import javax.swing.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.border.BevelBorder;
public class RunnableDemo extends JFrame implements Runnable, ActionListener {
 
    private JTextArea textArea; //文本域组件
    JLabel label;
    JButton startBtn;
    JButton pauseBtn;
    JButton resumeBtn;
    Panel panel;
    Thread thread;
    boolean move = false;
 
    //动画显示的文本字符串
    private final String introduction = "现在大家已经对计算机很熟悉了,如今计算机的操作"
            + "系统可以同时执行多个任务,在听歌的同时能够打字、下载文件,在聊天窗口打"
            + "字的时候,对方同时还能通过视频看到你;听到你。这一切都是使用多任务实现"
            + "的,Java语言使用多线程实现一个程序中的多个任务同时运行。程序员可以在程"
            + "序中执行多个线程,每一个线程完成一个功能,并与其他线程并发执行,这种机"
            + "制被称为多线程。";
 
    public RunnableDemo() {
        setTitle("线程的控制");
        label = new JLabel("多线程简介:KZ计算机218 文涵 2021961523");//标签组件
        getContentPane().add(label, BorderLayout.NORTH);            //添加标签到窗体
        textArea = new JTextArea("\t");                             //初始化文本域组件
        textArea.setBorder(new BevelBorder(BevelBorder.LOWERED));   //设置边框
        textArea.setLineWrap(true);                                 //设置自动折行
        getContentPane().add(textArea, BorderLayout.CENTER);        //添加文本域组件到文本框
        startBtn = new JButton("开始");
        pauseBtn = new JButton("暂停");
        resumeBtn = new JButton("恢复");
        startBtn.addActionListener(this);
        pauseBtn.addActionListener(this);
        resumeBtn.addActionListener(this);
        panel = new Panel();
        panel.add(startBtn);
        panel.add(pauseBtn);
        panel.add(resumeBtn);
        getContentPane().add(panel, BorderLayout.SOUTH);
        setBounds(0, 0, 383, 225); //设置窗体大小位置
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        setVisible(true); //显示窗体
    }
 
    @Override   //Runnable接口方法,是线程的执行方法.
    public void run() {
        textArea.setText("\t");
        String[] intros = introduction.split(""); //将字符串分割为数组
        for (String ch : intros) {//ForEach遍历字符串数组
            while (!move) {
                try {
                    synchronized (this) {
                        wait();
                    }
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
            textArea.append(ch); //添加一个字符到文本域
            try {
                Thread.sleep(100); //线程休眠0.1秒
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
        startBtn.setEnabled(true);
    }
 
    @Override
    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == startBtn) {
            thread = new Thread(this);
            thread.start();
            move = true;
        } else if (e.getSource() == pauseBtn) {
            move = false;
        } else if (e.getSource() == resumeBtn) {
            move = true;
            synchronized (this){
                notifyAll();
            }
        }
    }
 
    public static void main(String[] args) {
        new RunnableDemo().setLocationRelativeTo(null); //创建本类实例对象
    }
}

实验截图

1. 线程接力

image

2. 线程的控制

image

实验总结

在本次实验中,我主要学习了在Java语言中实现多线程的方法。

posted on 2024-05-22 13:38  Cloudservice  阅读(322)  评论(0编辑  收藏  举报