Difference:
i assigns a value first and then increments; i increments first and then assigns a value.
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For example:
int i=0;
System.out.println(i++);
System.out.println(i++);The first one prints out 0, the second one prints out 0 The first prints out 1
int i=0;
System.out.println(++i);
System.out.println(++i);The first prints out 1, the second prints out 2.
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