Zitat
call by value
When you call a method, the method sees a copy of any primitives past to it. Thus any changes it makes to those values have no effect on the caller's variables. This also applies to references passed as parameters. The caller cannot change the caller's reference variables, but it can change the fields in the caller's objects they point to.
call by reference
When you call a method by reference, the callee sees the caller's original variables passed as parameters, not copies. References to the callee's objects are treated the same way. Thus any changes the callee makes to the caller's variables affect the caller's original variables. Java never uses call by reference. It always uses call by value.
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