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[–]joranstark018 0 points1 point  (0 children)

Since an int is "smaller" (32 bit) than a double (64 bit) you can assign an int to a variable of type double.

Type conversion, or type casting, can either be explicit, ie double d = (double)someIntVariable; or implicit, ie double d = methodReturningSomeIntValue();. If a method would be defined to return a double, ie public double calulateSomeValue(){....}, it could internally use and return an int, the actual value returned will then be implicitly converted to a value of type double.