我正在做一些基本的Java Swing application
(初级水平)。
我要做的是当我按close button on JFrame
来收看窗口时我想要一个JOptionPane Confirm Dialog
而不是直接关闭
这是代码JFrame
JFrame frame= new JFrame("frame");
frame.setSize(300,300);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
frame.pack();
和JOptionPane代码就像这样
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,弹出窗口会出现而不是直接关闭
请指导我如何做到这一点..提前致谢
答案 0 :(得分:6)
是的,您可以使用WindowListener来完成此操作。
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);
有关详细信息,请参阅this tutorial。
但是对于您的方案,我建议您使用适配器类(因为您只需要一个事件,所以不需要累了并实现所有方法)所以这里有一个根据你的要求的例子
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 );
}
}
}
}
答案 1 :(得分:3)
您可以按照以下步骤执行此操作:
将行frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
替换为frame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
实施WindowListener
并覆盖其所有抽象方法。你可以find it here。
以某种方式覆盖public void windowClosing(WindowEvent e)
方法:
@Override
public void windowClosing(WindowEvent e){
int result = JOptionPane.showConfirmDialog(null, "Are you sure,"Confirm",JOptionPane.YES_NO_OPTION,JOptionPane.QUESTION_MESSAGE);
if(result == JOptionPane.YES_OPTION){
System.exit(0);
}else{
//Do nothing
}
}