How to make simple calculator in java

Making a simple calculator in Java Programming language is very easy just you need is some knowledge on this and I hope you are in this page in search of java tutorial so you may have some basic knowledge in it.
To make a calculator you must make a layout
Java Calculator
As Shown in the figure, the outer appearance of the calculator is made by a combination of Text areas and Jbutton added in pane.
And then the button pressed is noted and then the calculation is performed.

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