hiii.!
how to make a hollow square of asterisks by entering a size of side by user,
for example if 4 is entered then, it will be print,

* * * *
*     *
*     *
* * * *      of 4*4.

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With a Scanner or InputStreamReader and a for loop and an if statement with one else if and an else.

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With a Scanner or InputStreamReader and a for loop and an if statement with one else if and an else.

You just copy/pasted your assignment without even a moment taken to explain what help you need. That's highly disrepestectful to the many people who give their time to help others here.

There are lots of people here who will freely give their time to help you become the best Java programmer you can be. There's nobody here who is interested in helping you cheat or doing your homework for you.

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