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如何从另一个线程暂停和恢复Java中的线程_Java_Multithreading_Swing - Fatal编程技术网

如何从另一个线程暂停和恢复Java中的线程

如何从另一个线程暂停和恢复Java中的线程,java,multithreading,swing,Java,Multithreading,Swing,我正在用JavaSwing编写一个应用程序。我需要的是一个过程,在这个过程中,我可以使用图形界面中的按钮停止“精化”线程 这里有一个简单的项目,重点是我需要什么 import java.util.logging.Level; import java.util.logging.Logger; import javax.swing.JTextArea; /* * To change this template, choose Tools | Templates * and open the t

我正在用JavaSwing编写一个应用程序。我需要的是一个过程,在这个过程中,我可以使用图形界面中的按钮停止“精化”线程

这里有一个简单的项目,重点是我需要什么

import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JTextArea;

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

/**
 *
 * @author Nikola
 */
public class Main extends javax.swing.JFrame
{
    private MyThread THREAD;

    public Main()
    {
        initComponents();
    }

    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {

        jButton1 = new javax.swing.JButton();
        jScrollPane1 = new javax.swing.JScrollPane();
        jTextArea1 = new javax.swing.JTextArea();
        jButton2 = new javax.swing.JButton();
        jButton3 = new javax.swing.JButton();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        jButton1.setText("Pause Thread");
        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton1ActionPerformed(evt);
            }
        });

        jTextArea1.setColumns(20);
        jTextArea1.setRows(5);
        jScrollPane1.setViewportView(jTextArea1);

        jButton2.setText("Resume Thread");
        jButton2.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton2ActionPerformed(evt);
            }
        });

        jButton3.setText("Start Thread");
        jButton3.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton3ActionPerformed(evt);
            }
        });

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(jButton3)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 63, Short.MAX_VALUE)
                        .addComponent(jButton2)
                        .addGap(18, 18, 18)
                        .addComponent(jButton1))
                    .addComponent(jScrollPane1))
                .addContainerGap())
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 244, Short.MAX_VALUE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jButton1)
                    .addComponent(jButton2)
                    .addComponent(jButton3))
                .addContainerGap())
        );

        pack();
    }// </editor-fold>

    private void jButton3ActionPerformed(java.awt.event.ActionEvent evt)
    {
        THREAD = new MyThread(jTextArea1);
        THREAD.start();
    }

    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt)
    {
        try
        {
            THREAD.pauseThread();
        }
        catch (InterruptedException ex)
        {
            ex.printStackTrace();
        }
    }

    private void jButton2ActionPerformed(java.awt.event.ActionEvent evt)
    {
        THREAD.resumeThread();
    }

    public static void main(String args[])
    {
        /*
         * Set the Nimbus look and feel
         */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /*
         * If Nimbus (introduced in Java SE 6) is not available, stay with the
         * default look and feel. For details see
         * http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
         */
        try
        {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels())
            {
                if ("Nimbus".equals(info.getName()))
                {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        }
        catch (ClassNotFoundException ex)
        {
            java.util.logging.Logger.getLogger(Main.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        catch (InstantiationException ex)
        {
            java.util.logging.Logger.getLogger(Main.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        catch (IllegalAccessException ex)
        {
            java.util.logging.Logger.getLogger(Main.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        catch (javax.swing.UnsupportedLookAndFeelException ex)
        {
            java.util.logging.Logger.getLogger(Main.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        /*
         * Create and display the form
         */
        java.awt.EventQueue.invokeLater(new Runnable()
        {

            public void run()
            {
                new Main().setVisible(true);
            }
        });
    }
    // Variables declaration - do not modify
    private javax.swing.JButton jButton1;
    private javax.swing.JButton jButton2;
    private javax.swing.JButton jButton3;
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JTextArea jTextArea1;
    // End of variables declaration
}

class MyThread extends Thread
{
    JTextArea area;

    private final Object lock = new Object();

    public MyThread(JTextArea area)
    {
        super();
        this.area = area;
    }

    @Override
    public void run()
    {
        for(int i=0 ; ; i++)
            area.setText(i+"");
    }

    public void pauseThread() throws InterruptedException
    {
        synchronized(lock)
        {
            lock.wait();
        }
    }

    public void resumeThread()
    {
        synchronized(lock)
        {
            lock.notify();
        }
    }
}
import java.util.logging.Level;
导入java.util.logging.Logger;
导入javax.swing.JTextArea;
/*
*要更改此模板,请选择工具|模板
*然后在编辑器中打开模板。
*/
/**
*
*@作者尼古拉
*/
公共类Main扩展了javax.swing.JFrame
{
私有线程;
公用干管()
{
初始化组件();
}
@抑制警告(“未选中”)
// 
私有组件(){
jButton1=newjavax.swing.JButton();
jScrollPane1=newjavax.swing.JScrollPane();
jTextArea1=newjavax.swing.JTextArea();
jButton2=newjavax.swing.JButton();
jButton3=newjavax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setText(“暂停线程”);
jButton1.addActionListener(新java.awt.event.ActionListener(){
public void actionPerformed(java.awt.event.ActionEvent evt){
jButton1ActionPerformed(evt);
}
});
jTextArea1.设置列(20);
jTextArea1.设置行(5);
jScrollPane1.setViewportView(jTextArea1);
setText(“恢复线程”);
jButton2.addActionListener(新java.awt.event.ActionListener(){
public void actionPerformed(java.awt.event.ActionEvent evt){
jButton2ActionPerformed(evt);
}
});
setText(“开始线程”);
jButton3.addActionListener(新java.awt.event.ActionListener(){
public void actionPerformed(java.awt.event.ActionEvent evt){
JButton3执行的操作(evt);
}
});
javax.swing.GroupLayout=newjavax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(布局);
layout.setHorizontalGroup(
createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(jButton3)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED,63,Short.MAX_值)
.addComponent(jButton2)
.addGap(18,18,18)
.addComponent(jButton1))
.addComponent(jScrollPane1))
.addContainerGap())
);
layout.setVerticalGroup(
createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING,layout.createSequentialGroup()
.addContainerGap()
.addComponent(jScrollPane1,javax.swing.GroupLayout.DEFAULT\u SIZE,244,Short.MAX\u值)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jButton1)
.addComponent(jButton2)
.addComponent(jButton3))
.addContainerGap())
);
包装();
}// 
私有void jButton3ActionPerformed(java.awt.event.ActionEvent evt)
{
线程=新的MyThread(jTextArea1);
THREAD.start();
}
私有void jButton1ActionPerformed(java.awt.event.ActionEvent evt)
{
尝试
{
THREAD.pauseThread();
}
捕获(中断异常例外)
{
例如printStackTrace();
}
}
私有void jButton2ActionPerformed(java.awt.event.ActionEvent evt)
{
THREAD.resumeThread();
}
公共静态void main(字符串参数[])
{
/*
*设置Nimbus的外观和感觉
*/
//
/*
*如果Nimbus(在JavaSE6中引入)不可用,请使用
*默认外观。有关详细信息,请参阅
* http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
尝试
{
for(javax.swing.UIManager.LookAndFeelInfo:javax.swing.UIManager.getInstalledLookAndFeels())
{
if(“Nimbus”.equals(info.getName()))
{
setLookAndFeel(info.getClassName());
打破
}
}
}
捕获(ClassNotFoundException ex)
{
getLogger(Main.class.getName()).log(java.util.logging.Level.SEVERE,null,ex);
}
catch(实例化异常)
{
getLogger(Main.class.getName()).log(java.util.logging.Level.SEVERE,null,ex);
}
捕获(非法访问例外)
{
getLogger(Main.class.getName()).log(java.util.logging.Level.SEVERE,null,ex);
}
catch(javax.swing.UnsupportedLookAndFeelException ex)
{
getLogger(Main.class.getName()).log(java.util.logging.Level.SEVERE,null,ex);
}
//
/*
*创建并显示表单
*/
invokeLater(new Runnable())
{
公开募捐
{
new Main().setVisible(true);
}
});
}
//变量声明-不修改
私有javax.swing.JButton jButton1;
私有javax.swing.JButton jButton2;
私有javax.swing.JButton jButton3;
私有javax.swing.JScroll
class MyThread extends Thread {

    private volatile boolean running = true; // Run unless told to pause

    ...

    @Override
    public void run()
    {
        for(int i=0 ; ; i++)
        {
            // Only keep painting while "running" is true
            // This is a crude implementation of pausing the thread
            while (!running)
                yield;

            area.setText(i+"");
    }

    public void pauseThread() throws InterruptedException
    {
        running = false;
    }

    public void resumeThread()
    {
        running = true;
    }

}
class MyThread extends Thread {
    JTextArea area;
    private final Object GUI_INITIALIZATION_MONITOR = new Object();
    private boolean pauseThreadFlag = false;

    public MyThread(JTextArea area) {
        super();
        this.area = area;
    }

    @Override
    public void run() {
        for(int i=0 ; ; i++) {
            checkForPaused();
            area.setText(i+"");
        }
    }

    private void checkForPaused() {
        synchronized (GUI_INITIALIZATION_MONITOR) {
            while (pauseThreadFlag) {
                try {
                    GUI_INITIALIZATION_MONITOR.wait();
                } catch (Exception e) {}
            }
        }
    }

    public void pauseThread() throws InterruptedException {
        pauseThreadFlag = true;
    }

    public void resumeThread() {
        synchronized(GUI_INITIALIZATION_MONITOR) {
            pauseThreadFlag = false;
            GUI_INITIALIZATION_MONITOR.notify();
        }
    }
}