Answer 1

• Increment and Decrement Operators

Like C and C++, Java provides increment and decrement operators. Specifically, it provides the plus-one increment (++) and decrement (−−) operators.

 • If such an operator is used in front of a variable reference, then 1 is added to (or subtracted from) the variable and its value is read into the expression.

 • If it is used after a variable reference, then the value is first read and then the variable is incremented or decremented by 1.

So, for example, the code fragment

    int i = 8;
    int j = i++;
    int k = ++i;
    int m = i−−;
    int n = 9 + i++;

assigns 8 to j, 10 to k, 10 to m, 18 to n, and leaves i with value 10.

• https://code.sololearn.com/chPAcDs7YZgV/?ref=app

Answer 2

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Answer 3

If you use the prefix incrementation, it is first incremented then returned. The postfix returns the value first then increments. Both are correct, depends on what you want to achieve.