java - 制作第二个线程时遇到问题

Question

我正在尝试制作一个小程序，它在一定的时间间隔内单击鼠标左键一段时间。我无法解决的唯一问题是能够随时停止循环，甚至在计时器用完之前。我发现应该在工作线程中运行循环，并且我的停止按钮应该以某种方式中断该线程，但我无法管理它。我希望你能帮我写一些代码。

import java.awt.AWTException;
import java.awt.Robot;
import java.awt.event.*;
import java.util.logging.Level;
import java.util.logging.Logger;     
import javax.swing.*;

public class KeyRepeater_v2 extends javax.swing.JFrame {

Robot robot;

boolean stop;
double time;
double time_milli;


public KeyRepeater_v2() throws AWTException {
    this.robot = new Robot();
    initComponents();
}

/**
 * This method is called from within the constructor to initialize the form.
 * WARNING: Do NOT modify this code. The content of this method is always
 * regenerated by the Form Editor.
 */
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">                          
private void initComponents() {

    jButton1 = new javax.swing.JButton();
    jButton2 = new javax.swing.JButton();
    jTextField1 = new javax.swing.JTextField();
    jLabel1 = new javax.swing.JLabel();

    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

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

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

    jTextField1.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            jTextField1ActionPerformed(evt);
        }
    });

    jLabel1.setText("Timer");

    javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
    getContentPane().setLayout(layout);
    layout.setHorizontalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
            .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addGroup(layout.createSequentialGroup()
                    .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 137, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addGap(18, 18, 18)
                    .addComponent(jButton1)
                    .addGap(18, 18, 18)
                    .addComponent(jButton2, javax.swing.GroupLayout.PREFERRED_SIZE, 57, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addComponent(jLabel1))
            .addContainerGap())
    );
    layout.setVerticalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
            .addGap(41, 41, 41)
            .addComponent(jLabel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addComponent(jButton2, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addComponent(jTextField1, javax.swing.GroupLayout.Alignment.TRAILING)
                .addComponent(jButton1, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
            .addContainerGap())
    );

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


private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {                                         
    stop = true;
    //setFocusable (true);
    //JOptionPane.showMessageDialog(null, stop, "Test Titel", JOptionPane.OK_CANCEL_OPTION);
}                                        


private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
    stop = false;
    robot.delay(5000); //in milliseconds

    do {
            leftClick();
            robot.delay(1500);
            time_milli = time_milli - 1700;
    } while (time_milli > 0);

}                                        



private void jTextField1ActionPerformed(java.awt.event.ActionEvent evt) {                                            
    time = Double.parseDouble(jTextField1.getText()); 
    //System.out.print(time);
    time_milli = time * 1000;
}                                           




/**
 * @param args the command line arguments
 */
public static void main(String args[]) throws AWTException {
    /* 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(KeyRepeater_v2.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (InstantiationException ex) {
        java.util.logging.Logger.getLogger(KeyRepeater_v2.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (IllegalAccessException ex) {
        java.util.logging.Logger.getLogger(KeyRepeater_v2.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (javax.swing.UnsupportedLookAndFeelException ex) {
        java.util.logging.Logger.getLogger(KeyRepeater_v2.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    }
    //</editor-fold>

    /* Create and display the form */
    java.awt.EventQueue.invokeLater(() -> {
        try {
            new KeyRepeater_v2().setVisible(true);
        } catch (AWTException ex) {
            Logger.getLogger(KeyRepeater_v2.class.getName()).log(Level.SEVERE, null, ex);
        }
    });

}


private void leftClick() {
    robot.mousePress(InputEvent.BUTTON1_MASK);
    robot.delay(100);
    robot.mouseRelease(InputEvent.BUTTON1_MASK);
    robot.delay(100);
}


// Variables declaration - do not modify                     
private javax.swing.JButton jButton1;
private javax.swing.JButton jButton2;
private javax.swing.JLabel jLabel1;
private javax.swing.JTextField jTextField1;
// End of variables declaration                   

netbeans 生成了相当多的代码...我真的不知道如何创建一个新线程，我也不知道如何让我的文本字段(用于计时器)和我的按钮与线程通信......真的希望你能帮助我:D

Answer 1

您肯定想看看计时器。基本上，它是为了方便您使用线程。我不想修改太多你的代码，所以我为你提供了一个示例来替换你正在使用的 do while 循环(它来自官方 Timer's javadoc )。

ActionListener taskPerformer = new ActionListener() {
            public void actionPerformed(ActionEvent evt) {
                do {
                    System.out.println("left click");
                    leftClick();
                    robot.delay(1500);
                    time_milli = time_milli - 1700;
                } while (time_milli > 0);
            } 
        };
        new Timer(5000, taskPerformer).start();

请注意，我明确地为您留下了控制台打印，以检查您是否被要求执行每 5 秒的操作；当您单击更加用户友好的开始按钮时，定时器还可以防止您的 GUI 被卡住。