如何自动关闭 JOptionPane？

Question

我有一个Thread 正在运行，而在thread 工作时我想显示一个JOptionPane.showMessageDialog 表示应用程序正在工作并且在线程停止后，JOptionPane 将自动关闭并且OK按钮将一直停用。我的主要代码：

class Index {
public static void main(String args[]) {
   NewThread ob1 = new NewThread("One");
   NewThread ob2 = new NewThread("Two");
   NewThread ob3 = new NewThread("Three");
    System.out.println("Thread One is alive: "+ ob1.t.isAlive());
    System.out.println("Thread Two is alive: "+ ob2.t.isAlive());
    System.out.println("Thread Three is alive: "+ ob3.t.isAlive());
   while (ob1.t.isAlive()){
    JOptionPane.showMessageDialog(null,"Thread One is alive");
   }
    System.out.println("Thread One is alive: "+ ob1.t.isAlive());
    System.out.println("Thread Two is alive: "+ ob2.t.isAlive());
    System.out.println("Thread Three is alive: "+ ob3.t.isAlive());
    System.out.println("Main thread exiting.");
}}

当我运行它时，JOptionPane 显示，但除非我按下 OK 按钮，否则它不会自动关闭。

class NewThread implements Runnable {
String name; 
Thread t;
    NewThread(String threadname) {
        this.name = threadname;
        this.t = new Thread(this, name);
        System.out.println("New thread: " + t);
        this.t.start(); // Start the thread
    } 
public void run() {
    try {
    for(int i = 5; i > 0; i--) {
        System.out.println(name + ": " + i);
        Thread.sleep(1000);
        }
        } catch (InterruptedException e) {
        System.out.println(name + " interrupted.");}
        System.out.println(name + " exiting.");
}}

Answer 1

• 无需任何按钮即可创建您自己的Dialog...确保将defaultCloseOperation 设置为DO_NOTHING
• 使用ProgressMonitor

ProgressMonitor 示例...

import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import javax.swing.JFrame;
import javax.swing.ProgressMonitor;
import javax.swing.SwingWorker;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class TestProgress {

    public static void main(String[] args) {
        new TestProgress();
    }

    public TestProgress() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                }

                new BackgroundWorker().execute();

            }

        });
    }

    public class BackgroundWorker extends SwingWorker<Void, Void> {

        private ProgressMonitor monitor;

        public BackgroundWorker() {
            addPropertyChangeListener(new PropertyChangeListener() {
                @Override
                public void propertyChange(PropertyChangeEvent evt) {
                    if ("progress".equalsIgnoreCase(evt.getPropertyName())) {
                        if (monitor == null) {
                            monitor = new ProgressMonitor(null, "Processing", null, 0, 99);
                        }
                        monitor.setProgress(getProgress());
                    }
                }

            });
        }

        @Override
        protected void done() {
            if (monitor != null) {
                monitor.close();
            }
        }

        @Override
        protected Void doInBackground() throws Exception {
            for (int index = 0; index < 100; index++) {
                setProgress(index);
                Thread.sleep(125);
            }
            return null;
        }
    }
}

对话框示例

import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import javax.swing.JDialog;
import javax.swing.JLabel;
import javax.swing.JProgressBar;
import javax.swing.SwingWorker;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class TestProgress {

    public static void main(String[] args) {
        new TestProgress();
    }

    public TestProgress() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                }

                new BackgroundWorker().execute();

            }

        });
    }

    public class BackgroundWorker extends SwingWorker<Void, Void> {

        private JProgressBar pb;
        private JDialog dialog;

        public BackgroundWorker() {
            addPropertyChangeListener(new PropertyChangeListener() {
                @Override
                public void propertyChange(PropertyChangeEvent evt) {
                    if ("progress".equalsIgnoreCase(evt.getPropertyName())) {
                        if (dialog == null) {
                            dialog = new JDialog();
                            dialog.setTitle("Processing");
                            dialog.setLayout(new GridBagLayout());
                            dialog.setDefaultCloseOperation(JDialog.DO_NOTHING_ON_CLOSE);
                            GridBagConstraints gbc = new GridBagConstraints();
                            gbc.insets = new Insets(2, 2, 2, 2);
                            gbc.weightx = 1;
                            gbc.gridy = 0;
                            dialog.add(new JLabel("Processing..."), gbc);
                            pb = new JProgressBar();
                            gbc.gridy = 1;
                            dialog.add(pb, gbc);
                            dialog.pack();
                            dialog.setLocationRelativeTo(null);
                            dialog.setVisible(true);
                        }
                        pb.setValue(getProgress());
                    }
                }

            });
        }

        @Override
        protected void done() {
            if (dialog != null) {
                dialog.dispose();
            }
        }

        @Override
        protected Void doInBackground() throws Exception {
            for (int index = 0; index < 100; index++) {
                setProgress(index);
                Thread.sleep(125);
            }
            return null;
        }
    }
}

Answer 2

 JOptionPane msg = new JOptionPane("Mensagem de advertência", JOptionPane.WARNING_MESSAGE);
    final JDialog dlg = msg.createDialog("Advertência");
    dlg.setDefaultCloseOperation(JDialog.DO_NOTHING_ON_CLOSE);
    new Thread(new Runnable() {
      @Override
      public void run() {
        try {
          Thread.sleep(5000);
        } catch (InterruptedException e) {
          e.printStackTrace();
        }
        dlg.setVisible(false);
      }
    }).start();
    dlg.setVisible(true);