单击按钮后关闭 JFrame Java

Closing a JFrame after a button is clicked Java

提问by The Progenitor

Hello I am writing a sort of Menu for an encryption program I am writing. I finished the core of it, and now i want to try to create a GUI for it. Here is the code for the first Menu:

您好，我正在为我正在编写的加密程序编写一种菜单。我完成了它的核心，现在我想尝试为它创建一个 GUI。这是第一个菜单的代码：

package matrix_with_GUI;

import javax.swing.*;
import java.awt.event.* ;
import java.awt.* ;

public class Main_Menu extends JFrame implements ActionListener{
     private JButton action1 = new JButton ("");
     private JButton action2 = new JButton ("");
     private JPanel pane = new JPanel();
     private JLabel lbl;

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

public Main_Menu(){
    super();
    JPanel pane=new JPanel();
    setTitle ("Start Menu") ;
    JFrame frame = new JFrame("");

    setVisible(true);
    setSize (380, 260) ;
    setLocation (450, 200) ;
    frame.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE) ;

    action1 = new JButton("Start");
    action2 = new JButton("Exit");
    lbl = new JLabel ("Welcome to the Matrix Encoder/Decoder!!!");
    setLayout(new FlowLayout());

    add (lbl) ;
    add(action1, BorderLayout.CENTER);
    action1.addActionListener (this);
    add(action2, BorderLayout.CENTER);
    action2.addActionListener (this);
}
@Override
public void actionPerformed(ActionEvent event) {
    // TODO Auto-generated method stub
    OptionsMenu x = new OptionsMenu();
    if (event.getSource() == action1)
    {
        System.exit(0);
        x.OptionsMenu();
    }
    else if(event.getSource() == action2){
      System.exit(0);
    }

}

} When the Start Button is clicked, the new menu comes up all fine and good, but the first menu stays open. Is there a way to close this first menu AND open the second menu with the first button click? I'm very new to GUI so the simplest solution would be very helpful. On a side note is there a simple way to move the Start button to the next line? Thanks

当点击开始按钮时，新菜单出现的很好，但第一个菜单保持打开状态。有没有办法关闭第一个菜单并通过单击第一个按钮打开第二个菜单？我对 GUI 很陌生，所以最简单的解决方案会非常有帮助。附带说明一下，是否有一种简单的方法可以将“开始”按钮移动到下一行？谢谢

回答by user2277872

You have 2 options: you can use a Window Listener, or you can use the dispose() method. To do the dispose() just type

您有 2 个选择：您可以使用 Window Listener，或者您可以使用 dispose() 方法。要执行 dispose() 只需键入

* This is better to be used with subframes and 2nd level windows.*

this.dispose();

or check this link for using the window listener

或检查此链接以使用窗口侦听器

Closing JFrame

关闭 JFrame

回答by gkalpak

In order to close the Main_Menu, you can just call its disposemethod:

为了关闭 Main_Menu，你可以调用它的dispose方法：

this.dispose();

instead of calling System.exit(0), which will terminate the JVM altogether.

而不是调用System.exit(0)，这将完全终止 JVM。