以下示例展示了如何在基于swing的应用程序中显示错误消息警告。
使用以下API -
JOptionPane
- 创建标准对话框。JOptionPane.showMessageDialog()
- 显示消息警告。JOptionPane.ERROR_MESSAGE
- 将警报消息标记为错误。
示例
package com.yiibai.swingdemo;
import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.LayoutManager;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
public class SwingTester {
public static void main(String[] args) {
createWindow();
}
private static void createWindow() {
JFrame frame = new JFrame("Swing显示错误消息警告");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
createUI(frame);
frame.setSize(560, 200);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
private static void createUI(final JFrame frame){
JPanel panel = new JPanel();
LayoutManager layout = new FlowLayout();
panel.setLayout(layout);
JButton button = new JButton("点击我!");
button.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
JOptionPane.showMessageDialog(frame, "这是Swing错误警告消息~",
"Swing显示错误消息警告", JOptionPane.ERROR_MESSAGE);
}
});
panel.add(button);
frame.getContentPane().add(panel, BorderLayout.CENTER);
}
}
执行上面示例代码,得到以下结果: