Question

我从来不理解SwingUtilities.invokeLater，这就是我一直避免它的原因。但是让Swing Thread安全是非常重要的。好吧请原谅，因为这是我第一次这样做。我试图在一些数据库查询后关闭窗口。所以，据我所知， UI中的任何更新都必须由SwingUtilities.invokeLater处理。这是我的工作：

主：

public static void main(String args[]) {
    java.awt.EventQueue.invokeLater(new Runnable() {
    public void run() {
    new forminsert().setVisible(true);
forminsert f=new forminsert();
    }
    });

    }
  public forminsert() {
    initComponents();
}

public class forminsert extends javax.swing.JFrame {    
private void initComponents() {

    jPanel1 = new javax.swing.JPanel();
    jTextField1 = new javax.swing.JTextField();
    jButton1 = new javax.swing.JButton();
    jButton2 = new javax.swing.JButton();
    jButton3 = new javax.swing.JButton();

    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
    setUndecorated(true);

    jPanel1.setBackground(new java.awt.Color(0, 0, 0));
    jPanel1.setBorder(javax.swing.BorderFactory.createMatteBorder(3, 3, 3, 3, new java.awt.Color(0, 204, 204)));
              /////***REST CODE***/////           

}

ADD按钮上的列表器

  private void jButton2ActionPerformed(java.awt.event.ActionEvent evt)               {                                         
 new Thread(new thread1()).start();

}                                        
public class thread1 implements Runnable
{

    public void run() {
     insert ins=new insert();
    ////code for inserting///     
    }
 }

浏览按钮上的列表器

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt)                {                                         
    JFileChooser ss=new JFileChooser();
    ////Code to choose the file////
                 }

这是问题，要退出的代码。

private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) {

forminsert f=new forminsert();f.call();
}

public  void call()
{
java.awt.EventQueue.invokeLater(new Runnable() {
    public void run() {
 jPanel1.setVisible(false);
getRootPane().setVisible(false);

    }
    });

屏幕： screen short

请解释我哪里出错了，我不想使用System.exit，请原谅我提出太多问题。谢谢。

更新

以下是@trashgod

要求的示例工作代码

package faltur;

import java.io.File;
import javax.swing.JFileChooser;

public class insert extends javax.swing.JFrame {

/** Creates new form insert */
public insert() {
    initComponents();
}


@SuppressWarnings("unchecked")

 private void initComponents() {

    jPanel1 = new javax.swing.JPanel();
    jTextField1 = new javax.swing.JTextField();
    jButton1 = new javax.swing.JButton();
    jButton2 = new javax.swing.JButton();

    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
    setUndecorated(true);

    jPanel1.setForeground(new java.awt.Color(240, 240, 240));

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

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

    javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
    jPanel1.setLayout(jPanel1Layout);
    jPanel1Layout.setHorizontalGroup(
        jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(jPanel1Layout.createSequentialGroup()
            .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addGroup(jPanel1Layout.createSequentialGroup()
                    .addContainerGap()
                    .addComponent(jButton1)
                    .addGap(31, 31, 31)
                    .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 185, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGroup(jPanel1Layout.createSequentialGroup()
                    .addGap(153, 153, 153)
                    .addComponent(jButton2)))
            .addContainerGap(99, Short.MAX_VALUE))
    );
    jPanel1Layout.setVerticalGroup(
        jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(jPanel1Layout.createSequentialGroup()
            .addGap(66, 66, 66)
            .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                .addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 30, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
            .addGap(87, 87, 87)
            .addComponent(jButton2)
            .addContainerGap(94, Short.MAX_VALUE))
    );

    javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
    getContentPane().setLayout(layout);
    layout.setHorizontalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
    );
    layout.setVerticalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE,   javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
    );

    pack();
}

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt)                {                                         
 JFileChooser ss=new JFileChooser();
 ss.showOpenDialog(jTextField1);

 File f=ss.getSelectedFile();

   path=f.toString();
    System.out.println(path);

}                                        

private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
  insert in=new insert();
  in.exit();/////////////CALLS exit()/////////////////modify this//////
}


public static void main(String args[]) {
    java.awt.EventQueue.invokeLater(new Runnable() {
        public void run() {
            new insert().setVisible(true);
        }
    });
}
public void exit()////////////////////////MODIFY THIS///////////////////
{
jPanel1.getRootPane().setVisible(false);

}

private javax.swing.JButton jButton1;
private javax.swing.JButton jButton2;
private javax.swing.JPanel jPanel1;
private javax.swing.JTextField jTextField1;

 public String path="";
}

请运行并告诉如何修改exit()以便关闭窗口。再次感谢。

Answer 1

由于您的框架默认关闭操作为EXIT_ON_CLOSE，因此您可以通过WindowEvent.WINDOW_CLOSING发送dispatchEvent()，如图here所示。给定JFrame f，

private static final String EXIT = "Exit";
private Action exit = new AbstractAction(EXIT) {

        @Override
        public void actionPerformed(ActionEvent e) {
            f.dispatchEvent(new WindowEvent(
                f, WindowEvent.WINDOW_CLOSING));
        }
    };
private JButton b = new JButton(exit);

另请参阅How to Use Actions并遵循常见的coding conventions。

附录：基于修订后的代码，以下是退出程序的一种方法。注意类名通常以大写字母开头，而实例名称以小写字母开头。

private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
    insert.dispatchEvent(new WindowEvent(
        insert, WindowEvent.WINDOW_CLOSING));
}

public static void main(String args[]) {
    java.awt.EventQueue.invokeLater(new Runnable() {

        @Override
        public void run() {
            insert = new Insert();
            insert.setVisible(true);
        }
    });
}

private static Insert insert;
...

Answer 2

而不是使用foo.setVisible(false)，我只需将其更改为setVisible(false)，就可以了。

SwingUtilities.invokeLater：问题

2 个答案: