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That would be what is viewable means. To change what is shown by moving the viewable area up, down, left or right.

JScrollBar is a component that can be added to a JFrame. Then it'd be up to you to determine what is viewable on the JFrame as determined by the JScrollBar settings.

Please post the full text of the error message.

Indexes go out of bounds when you set them past the end of the array.
You need to display the length of the array and the value of the index as it...