Is it valid to compare a double with an int in java?

java comparison int double primitive-types
Tasos picture Tasos · Nov 8, 2012 · Viewed 64.7k times · Source 
Utilities.getDistance(uni, enemyuni) <= uni.getAttackRange()

Utilities.getDistance returns double and getAttackRange returns int. The above code is part of an if statement and it needs to be true. So is the comparison valid?

Thanks

Answer

Jon Skeet picture Jon Skeet · Nov 8, 2012

Yes, it's valid - it will promote the int to a double before performing the comparison.

See JLS section 15.20.1 (Numerical Comparison Operators) which links to JLS section 5.6.2 (Binary Numeric Promotion).

From the latter:

Widening primitive conversion (§5.1.2) is applied to convert either or both operands as specified by the following rules:

  • If either operand is of type double, the other is converted to double.

  • ...

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