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📜  Java中关闭AWT窗口

📅  最后修改于: 2020-09-29 05:38:09             🧑  作者: Mango

如何在Java中关闭AWT窗口

我们可以通过在windowClosing()方法内调用dispose()或System.exit()来关闭AWT窗口或框架。在WindowListener接口和WindowAdapter类中找到windowClosing()方法。

WindowAdapter类实现WindowListener接口。它提供了WindowListener接口的所有7种方法的默认实现。要覆盖windowClosing()方法，可以使用WindowAdapter类或WindowListener接口。

如果实现WindowListener接口，则将不得不重写WindowListener接口的所有7种方法。因此最好使用WindowAdapter类。

重写windowClosing()方法的不同方法

有许多方法可以覆盖windowClosing()方法：

  • 匿名班
  • 通过继承WindowAdapter类
  • 通过实现WindowListener接口

关闭AWT窗口示例1：匿名类

import java.awt.*;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;
public class WindowExample extends Frame{
WindowExample(){
addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e) {
dispose();
}
});
setSize(400,400);
setLayout(null);
setVisible(true);
}
public static void main(String[] args) {
new WindowExample();
}

输出：

关闭AWT窗口示例2：扩展WindowAdapter

import java.awt.*;
import java.awt.event.*;
public class AdapterExample extends WindowAdapter{
Frame f;
AdapterExample(){
f=new Frame();
f.addWindowListener(this);

f.setSize(400,400);
f.setLayout(null);
f.setVisible(true);
}
public void windowClosing(WindowEvent e) {
f.dispose();
}
public static void main(String[] args) {
new AdapterExample();
}
}

关闭AWT窗口示例3：实现WindowListener

import java.awt.*;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;
public class WindowExample extends Frame implements WindowListener{
WindowExample(){
addWindowListener(this);

setSize(400,400);
setLayout(null);
setVisible(true);
}

public static void main(String[] args) {
new WindowExample();
}
public void windowActivated(WindowEvent e) {}
public void windowClosed(WindowEvent e) {}
public void windowClosing(WindowEvent e) {
dispose();
}
public void windowDeactivated(WindowEvent e) {}
public void windowDeiconified(WindowEvent e) {}
public void windowIconified(WindowEvent e) {}
public void windowOpened(WindowEvent arg0) {}
}