When comparing any primitive type of variable, == should always be used to test to see if two values are equal.

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Quizplus · Accepted Answer

This is True of int, short, byte, long, char and boolean, but not of double or float variables. If two double variables, x and y, are being tested, (x == y) is True only if they are exactly equal to the last decimal point. It is common instead to compare these two values but allow for a small difference in value. For instance, if THETA = 0.000001, we might test x and y by (x - y <= THETA) instead of (x == y) to get a better idea of if they are close enough to be considered equal.

When Comparing Any Primitive Type of Variable, == Should Always