The int type stores whole numbers (no decimal point). It uses bits of memory, giving it a range from about billion to billion.
int count = 10;
int negative = -300;
int zero = 0;
You'll use int more than any other numeric type. Loop counters, array indices, ages, scores, counts. Whenever you need a whole number and the value fits within billion, int is your default choice.
One thing to watch: if you divide two int values, Java drops the decimal part. 7 / 2 gives 3, not 3.5. This catches many beginners off guard.