++i vs i++ java

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++i vs i++ java -

int a = 0;
int b = a++; // b = 0; a = 1

a = 0;
b = ++a: // b = 1; a = 1

++i vs i++ java -

int i = 3;
int a = i++; // a = 3, i = 4
int b = ++a; // b = 4, a = 4

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