Java如何禁用JFrame关闭按钮？
要禁用对a的关闭操作JFrame，当用户单击上的关闭图标时JFrame，我们可以将默认关闭操作的值设置为WindowConstants.DO_NOTHING_ON_CLOSE。
package org.nhooo.example.swing;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;
import javax.swing.WindowConstants;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.HeadlessException;
public class DisableCloseButtonDemo extends JFrame {
public DisableCloseButtonDemo() throws HeadlessException {
initialize();
}
public static void main(String[] args) {
SwingUtilities.invokeLater(() -> new DisableCloseButtonDemo().setVisible(true));
}
private void initialize() {
//WindowConstants.DO_NOTHING_ON_CLOSE告诉JFrame实例要做
//发生窗口关闭事件时没有任何反应。
this.setDefaultCloseOperation(WindowConstants.DO_NOTHING_ON_CLOSE);
JButton button = new JButton("Close");
button.addActionListener(e -> System.exit(0));
this.setLayout(new FlowLayout(FlowLayout.CENTER));
this.setSize(new Dimension(100, 100));
this.getContentPane().add(button);
}
}