Swing Examples – Show Error message Dialog

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Following example showcase how to show an error message alert in swing based application.

We are using the following APIs.

• JOptionPane − To create a standard dialog box.

• JOptionPane.showMessageDialog() − To show the message alert.

• JOptionPane.ERROR_MESSAGE − To mark the alert message as error.

Example

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 Tester");
      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("Click Me!");
      button.addActionListener(new ActionListener() {
         @Override
         public void actionPerformed(ActionEvent e) {
            JOptionPane.showMessageDialog(frame, "Please ensure compliance!",
               "Swing Tester", JOptionPane.ERROR_MESSAGE);
         }
      });

      panel.add(button);
      frame.getContentPane().add(panel, BorderLayout.CENTER);    
   }  
}

Output

swingexamples_dialogs.htm

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