What's the most idiomatic way in Java to verify that a cast from long
to int
does not lose any information?
This is my current implementation:
public static int safeLongToInt(long l) {
int i = (int)l;
if ((long)i != l) {
throw new IllegalArgumentException(l + " cannot be cast to int without changing its value.");
}
return i;
}
Best Answer
A new method has been added with Java 8 to do just that.
Will throw an
ArithmeticException
in case of overflow.See:
Math.toIntExact(long)
Several other overflow safe methods have been added to Java 8. They end with exact.
Examples:
Math.incrementExact(long)
Math.subtractExact(long, long)
Math.decrementExact(long)
Math.negateExact(long),
Math.subtractExact(int, int)