JFrame始终处​​于领先地位

Question

我正在用Java编写程序而我使用JPanel用于the界面，但我遇到问题总是在顶部，我不想要这个。我希望当我恢复另一个窗口时，它将位于顶部。

我尝试过：

this.setAlwaysOnTop(false);

但它不起作用，框架始终在最顶层。

这是一个简单的程序，我的问题是：

import javax.swing.AbstractButton;
import javax.swing.JButton;
import javax.swing.JPanel;
import javax.swing.JFrame;
import javax.swing.ImageIcon;
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;


public class BorrarRegistro extends JPanel
{

     public BorrarRegistro () {
     super(new BorderLayout());

     JLabel insertar= new JLabel("Registro");
     JTextField borrar= new JTextField();
     JButton borrar1= new JButton("Borrar Registro");

     JPanel borrarRegistro= new JPanel(new GridLayout(4,1));
     borrarRegistro.add(insertar);
     borrarRegistro.add(borrar);
     borrarRegistro.add(borrar1); 

     JPanel images= new JPanel(new GridLayout(1,3));


     add(images,BorderLayout.NORTH);
     add(borrarRegistro, BorderLayout.SOUTH);

  }

  private static void createAndShowGUI() {

    //Create and set up the window.
     JFrame frame = new JFrame("ClaseBase ");
     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

   // Create and set up the content pane.
     BorrarRegistro newContentPane = new BorrarRegistro ();
    newContentPane.setOpaque(true); //content panes must be opaque
     frame.setContentPane(newContentPane);

   // Display the window.
    frame.pack();
     frame.setVisible(true);

  }

  public static void main(String[] args) {
    //Schedule a job for the event-dispatching thread:
   // creating and showing this application's GUI.
     javax.swing.SwingUtilities.invokeLater(
           new Runnable() {
              public void run() {
                 createAndShowGUI(); 
              }

           });
  }
}

如何解决此问题？

Answer 1

您应该在创建框架时调用setAlwaysOnTop(false)。

private static void createAndShowGUI() {

    //Create and set up the window.
    JFrame frame = new JFrame("ClaseBase ");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    // Create and set up the content pane.
    Test newContentPane = new Test();
    newContentPane.setOpaque(true); //con
    frame.setContentPane(newContentPane);// tent panes must be opaque
    frame.setAlwaysOnTop(false);

    // Display the window.
    frame.pack();
    frame.setVisible(true);

}