Java Program to Create a Color Dialog Box to Change the Background Color of Frame

This is a Java Program to Create a Color Dialog Box to Change the Background Color of Frame

Problem Description

We have to write a program in Java such that it creates a button to open a color dialog box from where the user is able to select any color and the selected color is set as the background color of the frame.

Expected Input and Output

For changing color of frame using a color dialog box, we have the following different sets of input and output.

1. When the frame is created :

On the execution of the program,
it is expected that a frame appears with a button to open the color dialog box.

2. When a color is chosen :

When the button is clicked,
it is expected that a color dialog box appears and the user can select a color,
and the selected color becomes the background color of the frame.
suppose if we select the color Yellow.
then it is expected that the background color of the frame change to Yellow.

Problem Solution

1. Create a frame and a button.
2. Add ActionListener with the button.
3. When the button is clicked, create a color dialog box.
4. Get the selected color and change the background color of the frame.

Program/Source Code

Here is source code of the Java Program to change color of frame using color dialog box. 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 change color of frame using color dialog box*/

```
import javax.swing.*;
```
```
import java.awt.*;
```
```
import java.awt.event.*;
```

class Frame_Color implements ActionListener

```
{
```
```
    static JFrame frame;
```
```
    //Driver function
```

    public static void main(String args[])

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

	frame = new JFrame("Change Frame Background");

```
	frame.setSize(400,400);
```

	frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

	frame.getContentPane().setBackground(Color.white);

```
	frame.setLayout(new FlowLayout());
```
```
	//Create an object
```
```
	Frame_Color obj = new Frame_Color();
```
```
	//Create a button
```

	JButton button = new JButton("Change Color");

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

    //Function to create color dialog box and change color

    public void actionPerformed(ActionEvent e)

```
    {
```
```
	//Create a color dialog box
```

	JColorChooser color_box= new JColorChooser();

	Color color=color_box.showDialog(frame,"Select a Color",Color.white);

```
	//Change background color of frame
```

	frame.getContentPane().setBackground(color);

```
    }
```
```
}
```

Program Explanation

1. To create a color dialog box use JColorChooser class.
2. Display the color dialog box using showDialog(Component,title,initial color) function.
3. Update the color of the frame

Runtime Test Cases

Here’s the run time test cases for changing color of frame using color dialog box.

Test case 1 – To display the frame with button and dialog box.