我正在做一些基本的 Java Swing 应用程序
(初级)。
我要做的是当我按下 JFrame 上的关闭按钮
关闭窗口时我想要一个 JOptionPane 确认对话框
而不是直接关闭
这里是JFrame的代码
JFrame frame= new JFrame("frame");
frame.setSize(300,300);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
frame.pack();
JOptionPane 的代码是这样的
final JOptionPane optionPane = new JOptionPane("Are You sure?",JOptionPane.QUESTION_MESSAGE,
JOptionPane.YES_NO_OPTION);
所以当按下 JFrame 上的关闭按钮时,应该弹出这个弹出窗口而不是直接关闭
请指导我如何做..提前致谢
最佳答案
是的,您可以使用 WindowListener 来做到这一点.
public void windowClosed(WindowEvent e) {
//This will only be seen on standard output.
displayMessage("WindowListener method called: windowClosed.");
}
public void windowOpened(WindowEvent e) {
displayMessage("WindowListener method called: windowOpened.");
}
public void windowIconified(WindowEvent e) {
displayMessage("WindowListener method called: windowIconified.");
}
public void windowDeiconified(WindowEvent e) {
displayMessage("WindowListener method called: windowDeiconified.");
}
public void windowActivated(WindowEvent e) {
displayMessage("WindowListener method called: windowActivated.");
}
public void windowDeactivated(WindowEvent e) {
displayMessage("WindowListener method called: windowDeactivated.");
}
public void windowGainedFocus(WindowEvent e) {
displayMessage("WindowFocusListener method called: windowGainedFocus.");
}
public void windowLostFocus(WindowEvent e) {
displayMessage("WindowFocusListener method called: windowLostFocus.");
}
public void windowStateChanged(WindowEvent e) {
displayStateMessage(
"WindowStateListener method called: windowStateChanged.", e);
请看this tutorial了解更多详细信息。
但是对于您的场景,我建议您使用适配器类(因为您只需要一个事件,所以不需要厌倦并实现所有方法)所以这里是根据您的要求的示例< br/>
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
public class NoCloseFrame extends JFrame {
public static void main( String[] arg ) {
new NoCloseFrame();
}
public NoCloseFrame() {
super( "No Close Frame!" );
setDefaultCloseOperation( DO_NOTHING_ON_CLOSE );
setSize( 300, 300 );
setVisible( true );
addWindowListener( new AreYouSure() );
}
private class AreYouSure extends WindowAdapter {
public void windowClosing( WindowEvent e ) {
int option = JOptionPane.showOptionDialog(
NoCloseFrame.this,
"Are you sure you want to quit?",
"Exit Dialog", JOptionPane.YES_NO_OPTION,
JOptionPane.WARNING_MESSAGE, null, null,
null );
if( option == JOptionPane.YES_OPTION ) {
System.exit( 0 );
}
}
}
}
关于java - JFrame 关闭按钮的弹出窗口,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/15198549/