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Sat Nov 11 10:03:05 GMT 2006 bitwise operation on booleanbitwise operation on boolean The solution to the puzzle is given in the Java Language Specification, chapter 15.22.2: 15.22.2 Boolean Logical Operators &, ^, and | When both operands of a &, ^, or | operator are of type boolean, then the type of the bitwise operator expression is boolean. For &, the result value is true if both operand values are true; otherwise, the result is false. For ^, the result value is true if the operand values are different; otherwise, the result is false. For |, the result value is false if both operand values are false; otherwise, the result is true. http://beust.com/weblog/archives/000350.html Someone mentioned that there is no boolean, byte and short in byte code level, all just integer http://oddjava.com/?q=node/8 (google search) (amazon search) second |