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Message box appear in JFrame

Complete source code below will show you, how to make message box appear in a container.

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COMPLETE SOURCE CODE FOR : MessageBoxAppearInJFrame.java
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import javax.swing.JOptionPane;

import javax.swing.JFrame;

public class MessageBoxAppearInJFrame
{
public static void main(String[]args)
{
//Create a window using JFrame with title ( Message box appear in JFrame )
JFrame frame=new JFrame("Message box appear in JFrame");

//Set default close operation for JFrame
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

//Set JFrame size
frame.setSize(400,400);

//Make JFrame locate at center on screen
frame.setLocationRelativeTo(null);

//Make JFrame visible
frame.setVisible(true);


//Pop up a message box with text ( I am a message dialog ) in created JFrame
JOptionPane.showMessageDialog(frame,"I am a message dialog");
}
}


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JUST COMPILE AND EXECUTE IT
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