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

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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 (ยง5.1.2) 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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