Customise JScrollBar arrow

I would like to create JScrollBar with increase and decrease buttons at the bottom in case of vertical scrollbar as shown in the image attached. (Mac OS Style)

I need something like

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instead of

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Could you please help me with this?

Take a look at the source code for the ScrollBarUI or one of the L&F implementations, to see how the individual Look And Feel classes achieve what they achieve. You will then need to re-write the paint method to draw your version.

here is the source code for the BasicL&F.

However, I would also suggest searching for a L&F that already does this, as I am sure someone has already done this in one of the L&F platforms.