SwingUtilities.invokeLater：問題

Question

我從來沒有理解SwingUtilities.invokeLater，這是我直到現在一直避免它的原因。但它對於使Swing線程安全非常重要。 請原諒我，因爲這是我第一次與這個。 我想經過一些數據的基礎上query.So關閉窗口，據我瞭解，在 任何UI必須更新用由SwingUtilities.invokeLater。這裏處理是我的工作：

主營：

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***/////   

} 

聽者添加按鈕

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///  
    } 
} 

上瀏覽按鈕聽者

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

這裏是問題，代碼退出。

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：

請解釋我在哪裏，我錯了，我不希望使用System.exit，請原諒，我問太多questions.Thanks。

UPDATE：

這裏是工作代碼由@trashgod

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=""; 
} 

的要求，請運行，並告知如何修改exit()使其再次關閉window.Thanks樣本。

Answer 1

由於您的框架的默認關閉操作是EXIT_ON_CLOSE，您可以通過dispatchEvent()發送WindowEvent.WINDOW_CLOSING，如here所示。給定一個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); 

參見How to Use Actions並遵循共同coding conventions。

附錄：根據修改的代碼，這裏有一個方法退出該程序。注意類名通常以大寫字母開頭，而實例名稱則爲小寫字母。

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

好insted的使用foo.setVisible(false)的， 只是我把它改爲setVisible(false)，和它的工作。