Java Program to Display a Message in a New Frame

This is a Java Program to Display a Message in a New Frame

Problem Description

We have to write a program in Java such that it creates a frame with a button. When the button is clicked, a message is displayed in a new frame.

Expected Input and Output

For displaying a message in a new frame, we can have the following different sets of input and output.

1. To View the Original Frame :

On every execution of the program, 
it is expected that a frame with a button is created.

2. To View the Message in a New Frame :

On click of the button, 
it is expected that "!!! Hello !!!" message is displayed in a new frame.

Problem Solution

1. Create the original frame and add a button to it.
2. Add ActionListener to the button.
3. Display the original frame.
4. When the button is clicked, create a new frame and add a message to the frame.
5. Display the new frame.

Program/Source Code

Here is source code of the Java Program to display a message in a new frame. The program is successfully compiled and tested using javac compiler on Fedora 30. The program output is also shown below.

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/* Java Program to Display a Message in a New Frame */

```
import javax.swing.*;
```
```
import java.awt.event.*;
```
```
import java.awt.*;
```
```
class Message implements ActionListener
```
```
{
```

    //Function to create the original frame

    public static void main(String args[])

```
    {
```
```
	//Create a frame
```

	JFrame frame = new JFrame("Original Frame");

```
	frame.setSize(300,300);
```

	frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

```
 
```
```
	//Create an object
```
```
	Message obj = new Message();
```
```
 
```
```
	//Create a button to view message
```

	JButton button = new JButton("View Message");

```
	frame.add(button);
```
```
	button.addActionListener(obj);
```
```
 
```
```
	//View the frame
```
```
	frame.setVisible(true);
```
```
    }
```

    //Function to create a new frame with message

    public void actionPerformed(ActionEvent e)

```
    {
```
```
	//Create a new frame
```

	JFrame sub_frame = new JFrame("Sub Frame");

```
	sub_frame.setSize(200,200);
```
```
 
```
```
	//Display the message
```

	JLabel label = new JLabel("!!! Hello !!!");

```
	sub_frame.add(label);
```
```
 
```
```
	//View the new frame
```
```
	sub_frame.setVisible(true);
```
```
    }
```
```
}
```

Program Explanation

1. To create a frame, use the JFrame class.
2. To create a button, use the JButton class.
3. Add ActionListener to the button.

Runtime Test Cases

Here’s the run time test cases to display message a in new frame for different input cases.

Test case 1 – To View the Original Frame.

Test case 2 – To View the Message in New Frame.

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