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  • java线程池停止线程 停止线程 (Stopping a thread) As we know that there are no direct or shortcut ways to stop thread in Java. 众所周知,在Java中没有直接或快捷的方式来停止线程。 As we know thread in ...

    java线程池停止线程

    停止线程 (Stopping a thread)

    • As we know that there are no direct or shortcut ways to stop thread in Java.

      众所周知,在Java中没有直接或快捷的方式来停止线程。

    • As we know thread in java stops when the execution of run() method completed normally or thread stops if it raises an exception in the meanwhile of Thread completion.

      众所周知,当run()方法的执行正常完成时,java中的线程会停止;如果在线程完成的同时它引发异常,则线程会停止。

    • In previous versions of Java JDK there exists a method of Thread class named "stop" but this method is deprecated in later versions so it does not support in later versions of Java.

      在Java JDK的早期版本中,存在一个名为“ stop”的Thread类方法,但是该方法在更高版本中不推荐使用,因此在更高版本的Java中不支持。

    • Java does not provide some direct methods to stop thread in Java but there are some control methods defined in java JDK earlier versions and the names of the method are given below:

      Java没有提供一些直接的方法来停止Java中的线程,但是在Java JDK早期版本中定义了一些控制方法,该方法的名称如下:

      1. stop()
      2. suspend()
      3. resume()
    • All the methods given above are deprecated so it does not support in later versions of Java.

      上面给出的所有方法均已弃用,因此在更高版本的Java中不支持。

    • We will see how to stop a thread implicitly Java JDK stops a thread implicitly if and only if either a thread run() method completes it execution normally or if a thread raises an exception in the meanwhile.

      我们将看到如何隐式停止线程Java JDK仅在以下情况下隐式停止线程:(仅当线程run()方法正常完成了该线程的执行)或同时线程引发异常。

    • Now, we will see how to stop a thread manually: we can stop a thread manually in two ways:

      现在,我们将看到如何手动停止线程:我们可以通过两种方式手动停止线程:

      1. With the help of volatile boolean variable
      2. With the help of interrupt() method

    Now we will elaborate on each way one by one is given below...

    现在,我们将在下面逐一详细说明每种方式...

    With the help of volatile boolean variable

    借助volatile布尔变量

    • In the first step, we will declare a volatile boolean variable in a thread.

      第一步,我们将在线程中声明一个易失的布尔变量。

    • In the second step initially, we will assign the value of the volatile boolean variable as true.

      首先,在第二步中,我们将volatile布尔变量的值分配为true。

    • In the third step, we will define a job inside while loop and passing parameter of the volatile boolean variable in while loop and we will keep loop inside run() method. By using loop the thread will continue to run until volatile boolean variable becomes false.

      在第三步中,我们将在while循环中定义作业,并在while循环中传递易失布尔变量的参数,并将循环保留在run()方法中。 通过使用循环,线程将继续运行,直到volatile布尔变量变为false。

    • In the fourth step, we will define another method named "stopThread()" inside a thread and in this method, we will set volatile boolean variable is set to false to stop the thread.

      在第四步中,我们将在线程内定义另一个名为“ stopThread()”的方法,在此方法中,我们将volatile布尔变量设置为false以停止线程。

    • In the fifth or final step, we don’t need to do anything manually to stop the thread. To stop a thread we can simply call user-defined stopThread() method to stop the thread.

      在第五步或最后一步,我们不需要手动执行任何操作即可停止线程。 要停止线程,我们可以简单地调用用户定义的stopThread()方法来停止线程。

    Example:

    例:

    // Java program to stop a thread with the help of 
    // volatile boolean variable
    
    class ChildThread extends Thread {
        // intially assign boolean variable with value as true
        volatile boolean thread_stop = true;
    
        // this method is defined to stop a thread
        public void stopThread() {
            thread_stop = false;
        }
    
        // this loop will continue until boolean variable become false
        public void run() {
            while (thread_stop) {
                System.out.println("Child Thread Started");
            }
            System.out.println("Child Thread Ended");
        }
    }
    
    class Main {
        public static void main(String[] args) {
            ChildThread ct = new ChildThread();
            ct.start();
            try {
                Thread.sleep(100);
            } catch (Exception ex) {
                System.out.println(ex.getMessage());
            }
    
            // this method will be called to stop a thread
            ct.stopThread();
        }
    }
    
    

    Output

    输出量

    Child Thread Started
    Child Thread Started
    Child Thread Started
    Child Thread Started
    Child Thread Started
    Child Thread Started
    Child Thread Started
    Child Thread Started
    Child Thread Started
    Child Thread Started
    Child Thread Started
    Child Thread Started
    .
    .
    .
    .
    .
    Child Thread Started
    Child Thread Started
    Child Thread Started
    Child Thread Started
    Child Thread Started
    Child Thread Started
    Child Thread Ended
    
    

    With the help of interrupt() method

    借助interrupt()方法

    We will use readymade interrupt() method to stop a thread.

    我们将使用现成的interrupt()方法来停止线程。

    When we call interrupt method on a thread object and it will assign the interrupted status of a thread and this status can be generated by the interrupted() method.

    当我们在线程对象上调用中断方法时,它将分配线程的中断状态,并且此状态可以由interrupted()方法生成。

    Example:

    例:

    // Java program to stop a thread by using interrupt() method
    
    class ChildThread extends Thread {
        // this loop will continue until boolean variable become false
        public void run() {
            while (!Thread.interrupted()) {
                System.out.println("Child Thread Started");
            }
            System.out.println("Child Thread Ended");
        }
    }
    
    class Main {
        public static void main(String[] args) {
            ChildThread ct = new ChildThread();
            ct.start();
            try {
                Thread.sleep(100);
            } catch (Exception ex) {
                System.out.println(ex.getMessage());
            }
    
            // this method will be called to interrupt a thread
            ct.interrupt();
        }
    }
    
    

    Output

    输出量

    Child Thread Started
    Child Thread Started
    Child Thread Started
    Child Thread Started
    Child Thread Started
    Child Thread Started
    Child Thread Started
    Child Thread Started
    Child Thread Started
    Child Thread Started
    Child Thread Started
    Child Thread Started
    .
    .
    .
    .
    .
    Child Thread Started
    Child Thread Started
    Child Thread Started
    Child Thread Started
    Child Thread Started
    Child Thread Started
    Child Thread Ended
    
    
    

    翻译自: https://www.includehelp.com/java/how-to-stop-a-thread-in-java.aspx

    java线程池停止线程

    展开全文
  • java停止线程的方法

    2018-09-13 11:19:08
    java停止正在运行的线程的办法,自从stop方法过时之后,就剩下一个interrupt。但是这个interrupt是“尝试”打断线程,如果线程正在运行,它只是给线程置一个状态,线程周期性的判断状态退出;如果线程正在sleep、...

    java停止正在运行的线程的办法,自从stop方法过时之后,就剩下一个interrupt。但是这个interrupt是“尝试”打断线程,如果线程正在运行,它只是给线程置一个状态,线程周期性的判断状态退出;如果线程正在sleep、wait等,线程会被打断,并抛出一个异常。

    也就是说终止正在运行的线程是有可能的,但一个问题是如果调用到这个interrupt,这个interrupt一般是外界的一个动作(比如点击一个停止按钮)触发的。

    可以有两个办法:一是线程启动前用变量保持线程的引用,进而可以调用线程的终端方法。二是可以使用线程池,要有一个管理类持有和管理线程池,调用线程池的关闭方法shutdownNow,进而间接调用线程的中断方法。但是线程池一般是需要长期存活使用的,不能因为一次终止线程导致线程池不可用,所以每次使用线程池记得检查状态,如果关闭了就需要重新初始化线程池,初始化时还需要注意线程安全问题。

    以上两个是直接停止线程的办法,还有一个类似的办法,就是使用信号量,当需要停止线程时给一个volatile静态变量置值,线程周期性的检查此值退出。不过还是建议使用interrupt方法,个人认为自己的实现效率可能没有jdk类库的效率高,尚未验证。

    展开全文
  • wait和notify代码 用綫程的名字而不是this來控制縣城 ...import java.awt.*; import java.awt.event.ActionListener; import java.awt.event.ActionEvent; import javax.swing.*; public class ThreadPrin...

    wait和notify

    用綫程的名字而不是this來控制縣城

    代码

    package inheritance;
    
     
    
    import java.awt.*;
    import java.awt.event.ActionListener;
    import java.awt.event.ActionEvent;
    
    import javax.swing.*;
    
    public class ThreadPrintTest extends JFrame{
    	boolean suspended=false;
    	JTextArea jt=new JTextArea();	
    	final JButton jb=new JButton("开始");
    	final JButton jb2=new JButton("结束");
    	Thread thread1=null;
    		
    	public ThreadPrintTest() {
    		super();
    		Container c=getContentPane();
    		setLayout(new FlowLayout(2,10,10));
    		jt.setSize(100,100);
    		jt.setLineWrap(true);
    		c.add(jt);
    		c.add(jb);
    		c.add(jb2);
    		
    		jb.addActionListener(new ActionListener() {
    			public void actionPerformed(ActionEvent e) {				
    				if(thread1==null) {
    					thread1=new Thread(new MyThread());
    					thread1.start();
    				}
    				else {					
    					synchronized(thread1) {               
    						thread1.notify();                   
    	                }
    					suspended = false;					
    				}
    				
    			}
    		});
    		jb2.addActionListener(new ActionListener() {
    			public void actionPerformed(ActionEvent e) {				
    				suspended = true;			
    			}
    		});		
    	}
    	public static void main(String [] args) {
    		init(new ThreadPrintTest(),300,200);
    	}
    	public static void init(JFrame frame,int width,int height) {
    		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    		frame.setSize(width, height);
    		frame.setVisible(true);
    	}
    	
    	private final class MyThread implements Runnable{
    		
    		public void run() {
    			while(true) {
    				jt.append("加油!");
    				synchronized (thread1) {
    					try {
    							Thread.sleep(1000);
    							if(suspended) {
    								thread1.wait();
    							}
    					}catch(InterruptedException e) {
    						System.out.println("当前线程被中断");
    						break;
    					}	
    				}	
    			}
    		}	
    	}
    }
    
    
    展开全文
  • 练习使用多线程来实现点击按钮创建一个小球并且多个小球同时移动的效果

    实验要求:

    弹球程序。编写程序,该程序通过一个发射按钮可以发射一个弹球,该球遇到边界时会自动弹回,在移动固定次数后,该球停止运动。要求每次点击发射按钮都会发射一个弹球,如果点击多次,则多个弹球同时运动。该程序通过另一个结束可以结束程序的运行


    代码:

    package text5;



    import java.awt.event.*;


    import javax.swing.*;


    import java.awt.*; 
    import java.util.Random;
    import java.util.concurrent.locks.Lock;
    import java.util.concurrent.locks.ReentrantLock;




    @SuppressWarnings("serial")
    public class xiaoqiu extends JFrame implements ActionListener{
    final Lock l = new ReentrantLock();
    double k;
    private static int jishu = 1;
    MyPanel clockPanel;
    JButton button1;
    JButton button2;
    Random random = new Random();
    Run run;
    int count = 0;
    int [] dian_x = new int [1000];
    int [] dian_y = new int [1000];
    int n = 0;
    int x = 0;
    int y = 0;
    int a[] = new int [] {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
    int b[] = new int [] {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
    int zzdian_x[] = new int [] {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
    int zzdian_y[] = new int [] {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};


    int left[] = new int [1000];
    int right[] = new int [1000];
    int down[] = new int [1000];
    int up[] = new int [1000];
    public xiaoqiu()
    {
            clockPanel = new MyPanel();

    button1 = new JButton("开始");
    button1.setBounds(140, 400, 60, 30);
    button1.addActionListener(this);

    button2 = new JButton("结束");
    button2.setBounds(300, 400, 60, 30);
    button2.addActionListener(this);

    add(button1);
    add(button2);
            add(clockPanel);
    }

    public void actionPerformed(ActionEvent e) {
    if(e.getSource() == button1)
    {
      count ++;
      n ++;
    a[count] = Math.abs(random.nextInt() % 3) + 1;
    b[count] = Math.abs(random.nextInt() % 3) + 1;
    new Run().start();
    jishu = n;
    right[jishu] = 1;
    left[jishu] = 0;
    down[jishu] = 1;
    up[jishu] = 0;
    dian_x[jishu] = 0;
    dian_y[jishu] = 0;
    }
    else
    {
    System.exit(0);
    }
    }


    class MyPanel extends JPanel
        {  
            public void paint(Graphics g) {
        for(int i = 1; i<= n; i++)
        {
        g.setColor(Color.green); 
        g.fillOval(dian_x[i], dian_y[i], 10, 10);
        g.setColor(Color.yellow); 
        g.fillOval(dian_x[i] + 3, dian_y[i] + 3, 4, 4);
        g.setColor(Color.red); 
        g.fillOval(dian_x[i] + 4, dian_y[i] + 4, 2, 2);
        }
    int yy = (dian_y[jishu] - zzdian_y[jishu]);
    int xx = (dian_x[jishu] - zzdian_x[jishu]);
    if(xx != 0 && yy != 0)
    {
        if(dian_x[jishu] + 10 > 485 && dian_y[jishu] > 0 && dian_y[jishu] + 10 < 460)//右边界
        {
        if(yy < 0)
        {
        left[jishu] = 1;
        right[jishu] = 0;
        down[jishu] = 0;
        up[jishu] = 1;
        }
        else
        {
        left[jishu] = 1;
        right[jishu] = 0;
        down[jishu] = 1;
        up[jishu] = 0;
        }
        zzdian_x[jishu] = dian_x[jishu];
        zzdian_y[jishu] = dian_y[jishu];
        }
       
        else if(dian_y[jishu] + 10 > 460 && dian_x[jishu] > 0 && dian_x[jishu] + 10 < 485)//下边界
        {
        if(xx < 0)
        {
        left[jishu] = 1;
        right[jishu] = 0;
        down[jishu] = 0;
        up[jishu] = 1;
        }
        else
        {
        left[jishu] = 0;
        right[jishu] = 1;
        down[jishu] = 0;
        up[jishu] = 1;
        }
        zzdian_x[jishu] = dian_x[jishu];
        zzdian_y[jishu] = dian_y[jishu];
        }
       
        else if(dian_x[jishu]  <= 0 && dian_y[jishu] > 0 && dian_y[jishu] + 10 < 460)//左边界
        {
        if(yy > 0)
        {
        left[jishu] = 0;
        right[jishu] = 1;
        down[jishu] = 1;
        up[jishu] = 0;
        }
        else
        {
        left[jishu] = 0;
        right[jishu] = 1;
        down[jishu] = 0;
        up[jishu] = 1;
        }
        zzdian_x[jishu] = dian_x[jishu];
        zzdian_y[jishu] = dian_y[jishu];
        }
        else if(dian_y[jishu] <= 0 && dian_x[jishu] > 0 && dian_x[jishu] + 10 < 485)//上边界
        {
        if(xx < 0)
        {
        left[jishu] = 1;
        right[jishu] = 0;
        down[jishu] = 1;
        up[jishu] = 0;
        }
        else
        {
        left[jishu] = 0;
        right[jishu] = 1;
        down[jishu] = 1;
        up[jishu] = 0;
        }
        zzdian_x[jishu] = dian_x[jishu];
        zzdian_y[jishu] = dian_y[jishu];
        }
        else if(dian_x[jishu] <= 0 && dian_y[jishu] <= 0)//左上角
        {
        a[jishu] = 1;
        b[jishu] = 1;
        left[jishu] = 0;
        right[jishu] = 1;
        down[jishu] = 1;
        up[jishu] = 0;
        }
        else if(dian_x[jishu] + 10 >= 485 && dian_y[jishu] <= 0)//右上角
        {
        a[jishu] = 1;
        b[jishu] = 1;
        left[jishu] = 1;
        right[jishu] = 0;
        down[jishu] = 1;
        up[jishu] = 0;
        }
        else if(dian_x[jishu] + 10 >= 485 && dian_y[jishu] + 10 >= 460)//右下角
        {
        a[jishu] = 1;
        b[jishu] = 1;
        left[jishu] = 1;
        right[jishu] = 0;
        down[jishu] = 0;
        up[jishu] = 1;
        }
        else if(dian_x[jishu] <= 0 && dian_y[jishu] + 10 >= 460)//左下角
        {
        a[jishu] = 1;
        b[jishu] = 1;
        left[jishu] = 0;
        right[jishu] = 1;
        down[jishu] = 0;
        up[jishu] = 1;
        }
        }
    if(right[jishu] == 1)
    dian_x[jishu] = dian_x[jishu] + a[jishu];
    if(left[jishu] == 1)
    dian_x[jishu] = dian_x[jishu] - a[jishu];
    if(down[jishu] == 1)
    dian_y[jishu] = dian_y[jishu] + b[jishu];
    if(up[jishu] == 1)
    dian_y[jishu] = dian_y[jishu] - b[jishu];

            }  
        }

    private class Run extends Thread implements Runnable
    {
    public void run() 
    {
    while(true)
    {
    l.lock();
    if(jishu > n)
    jishu = 1;
    try
       {
    Thread.sleep(10/n);
       }catch(Exception e)
       {   
        e.printStackTrace();
       }
        repaint();
    jishu ++;
    l.unlock();
    }
    }
    }

    public static void main(String[] args) {
    xiaoqiu tread = new xiaoqiu();
    tread.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);  
    tread.setBounds(400, 200, 500, 500);
    tread.setVisible(true);
    }
    }
    展开全文
  • Java线程

    万次阅读 多人点赞 2021-06-11 16:28:49
    Java线程Java线程线程的创建线程常见方法线程的状态线程的优先级守护线程线程Java线程池线程池的创建线程池的参数线程池的使用线程不安全问题Java中的锁synchronized同步方法synchronized同步语句块...
  • import java.awt.FlowLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel;
  • Java并发与多线程

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