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Java Forum / General / September 2007Method.invoke() with one arg compiles despite method signature
Hi This has got me stumped jdk1.5.0_10 I can compile and run the code for RunTests and associated classes at http://java.sun.com/j2se/1.5.0/docs/guide/language/annotations.html However the Java 2 Platform Standard Ed. 5.0 javadoc for Method shows the following signature for invoke Object invoke(Object obj, Object... args) The particular bit of the code that is causing me a problem is ... try { m.invoke(null); ... I have looked at the code for Method and there is only one 2 arg method called invoke. How then am I managing to compile and run the aforementioned code ... surely the compiler should flag this as a compile time error. Obviously I'm missing something but I can't see what. What am I missing ? ... Thanks in advance Duncan > However the Java 2 Platform Standard Ed. 5.0 javadoc for Method shows > the following signature for invoke > > Object invoke(Object obj, Object... args) > try { > m.invoke(null); [quoted text clipped - 4 lines] > aforementioned code ... surely the compiler should flag this as a > compile time error. Obviously I'm missing something but I can't see what. The second argument is a varargs argument, which is translated to an array automatically by the compiler. If omitted, the varargs argument is populated with an empty array. -Owen >> However the Java 2 Platform Standard Ed. 5.0 javadoc for Method shows >> the following signature for invoke [quoted text clipped - 11 lines] > > The second argument is a varargs argument, Oh ******, and I thought I had got a handle on all the new 1.5 features. Thanks for that Duncan >>> However the Java 2 Platform Standard Ed. 5.0 javadoc for Method >>> shows the following signature for invoke [quoted text clipped - 15 lines] > Oh ******, and I thought I had got a handle on all the new 1.5 > features. The ones that were introduced to make your life easier? :-) >>>> However the Java 2 Platform Standard Ed. 5.0 javadoc for Method >>>> shows the following signature for invoke [quoted text clipped - 3 lines] > > The ones that were introduced to make your life easier? :-) :-) Yea, they're the ones. Sometimes I think that some of these 'enhancements' are only invented to give anal interviewers something to pick up on to make themselves feel superior when they are interviewing you for some squalid little job in some ghastly sweatshop. Never give up, never surrender. Galaxy Quest, the best film EVER ;-) >Object invoke(Object obj, Object... args) > [quoted text clipped - 7 lines] >I have looked at the code for Method and there is only one 2 arg method >called invoke. I had to read your post several time to figure out why you thought that code should not work. Object ... arg --- the parm list can also be empty (unlike the ... ellipsis in English). This effectively gives you a 1-arg constructor.  SignatureRoedy Green Canadian Mind Products The Java Glossary http://mindprod.com >> Object invoke(Object obj, Object... args) >> [quoted text clipped - 10 lines] > I had to read your post several time to figure out why you thought > that code should not work. Really, I thought I'd made it quite clear, oh well, it's all sorted now. Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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