Java Program to Create a Vertical Scrollbar with Scroll Button Length 30px

This is a Java program to create a vertical scrollbar with a scroll button length 30px.

Problem Description

We have to write a program in Java such that it creates a vertical scrollbar whose starting and ending positions are 0px and 400px with scroll button length 30px.

Expected Input and Output

For creating a vertical scrollbar, we can have the following set of input and output.

To Create a Vertical Scrollbar :
At the execution of the program, it is expected that the frame consists of a vertical scrollbar with the given parameters (0px, 400px) with scroll button length 30px.

Problem Solution

1. Create a frame.
2. Create a scrollbar with vertical orientation and scroll size 30px.
3. Set the minimum and maximum value of scroll bar to 0 and 400 respectively.
4. Add the scrollbar to frame, and display the frame.

Program/Source Code

Here is source code of the Java Program to create a vertical scrollbar. The program is successfully compiled and tested using javac compiler on Fedora 30.

/*Java Program to create a vertical scrollbar*/

```
import javax.swing.*;
```
```
import java.awt.*;
```
```
class Vertical_ScrollBar
```
```
{
```
```
	//Driver function
```
```
	public static void main(String args[])
```
```
	{
```
```
		//Create a frame
```

		JFrame frame=new JFrame("Vertical Scrollbar");

```
		frame.setSize(500,500);
```
```
		frame.setLayout(null);
```

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

		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

```
		//Create a Scrollbar
```
```
		Scrollbar scroll=new Scrollbar();
```

		scroll.setOrientation(Scrollbar.VERTICAL);

```
		scroll.setBounds(225,0,50,400);
```
```
		scroll.setMaximum(400);
```
```
		scroll.setMinimum(0);
```
```
		//Set size of scroll
```
```
		scroll.setVisibleAmount(30);
```
```
		//Add scrollbar to frame
```
```
		frame.add(scroll);
```
```
		//Display the frame
```
```
		frame.setVisible(true);
```
```
	}
```
```
}
```

Program Explanation

1. Create a frame with background color & specific size. frame.setBackground(Color.white); is used to create the frame background color as white. frame.setSize(500,500); is used to set the width and height of the frame.
2. frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); is a default close operation for the frame.
3. Create a scrollbar and add it to the frame by using frame.add();.
Scrollbar scroll=new Scrollbar(); –> Used to create the scrollbar.
4. scroll.setOrientation(Scrollbar.VERTICAL); –> setOrientation is used to set the orientation of the scrollbar to vertical or horizontal. The orientation of the scrollbar used in this program is vertical.
5. scroll.setBounds(225,0,50,400); –> Sets the position of scrollbar.
6. scroll.setMaximum(400); –> setMaximum is used to set the maximum value of the scrollbar. The maximum value the scrollbar in this program is 400px.
7. scroll.setMinimum(0); –> setMinimum is used to set the minimum value of the scrollbar. The minimum value the scrollbar in this program is 0px.
8. scroll.setVisibleAmount(30); –> setVisibleAmount is used to set the size of the scroll. The size of the scroll in this program is 30px.
9. frame.add(scroll); –> It is used to add the scrollbar to the frame.
10. frame.setVisible(true); is used to display the frame.

Runtime Test Cases

Here’s the run time test case for creating a vertical scrollbar.

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Test case – Here’s the runtime output to view the scrollbar. Once the program is executed, it displays the frame which consists of a vertical scrollbar with the given parameters (0px, 400px) with scroll button length 30px.

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