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If you want to tell Java explicitly to convert a value from one type to another, rather than relying on automatic conversion, you cast the expression. To cast, you prefix the expression with the name of the desired type in parentheses.
If, for example, i is an int and d is a double,
you can cast i to a double and d to an int as
follows:
(double) i // A double expression (int) d // An int expression
Note that the original types of the i and d variables remain
undisturbed: i remains an int variable, and d remains a
double variable.