java使用第二个线程停止主线程
我对Java线程有问题。 假设我们有一个名为main的主线程和一个名为Frame的第二个线程。此外,框架还有一个按钮。总的来说,只要按下JFrame中的按钮,我们就有一个循环在运行
我为此写了一个简短的例子,首先是Frame类:
public class Frame extends javax.swing.JFrame{
private boolean isRunning;
public Frame() {
initComponents();
isRunning = true;
}
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
isRunning = false;
}
public boolean isRunning(){
return isRunning;
}
// ***** Some netbeans stadard stuff *****
/**
* 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();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jButton1.setText("Stop");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(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()
.addGap(167, 167, 167)
.addComponent(jButton1)
.addContainerGap(178, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addContainerGap(153, Short.MAX_VALUE)
.addComponent(jButton1)
.addGap(124, 124, 124))
);
pack();
}// </editor-fold>
public void main() {
/* 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(Frame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(Frame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(Frame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(Frame.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 Frame().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton jButton1;
// End of variables declaration
// ***** End of this netbeans stuff *****
}
现在是主课
public class Main {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
Frame f = new Frame();
f.main();
for (int i = 0; f.isRunning(); i++) {
System.out.println((i + 1));
try {
Thread.sleep(1000);
} catch (InterruptedException ex) {
Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
}
但是,如果我按下按钮,什么都不会发生。我还尝试用“implements Runnable”扩展类框架,重写run()-方法,并在Main中以以下内容开头:
Thread t = new Thread(new Frame());
t.start();
但我也有同样的问题
拜托,有人能帮我吗
向马蒂亚斯问好
# 1 楼答案
你没有展示正确的
Frame
在
Main
中,您正在创建一个新的Frame
实例然后在
Frame
中,你正在创建另一个在
Main
类中创建的Frame
不是出现的那个,这就是为什么f.isRunning()
总是返回true
。您可以通过显示正确的帧来解决此问题: