at:tutorial:symbiosis
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at:tutorial:symbiosis [2007/07/05 09:34] – jdedecker | at:tutorial:symbiosis [2007/07/05 10:00] – jdedecker | ||
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If the Java method is overloaded based on arity (i.e. each overloaded method takes a different number of arguments), the number of arguments in the AmbientTalk invocation can be used to identify a unique Java method. Hence, overloading based on arity does not require special attention. If the Java method is overloaded based solely on argument types, the interpreter may derive that the actual arguments can only be converted from AmbientTalk to the appropriate Java types for one of the matching overloaded signatures. Again, if only one match remains, the unique match is invoked. In the remaining case in which the actual AmbientTalk arguments satisfy more than one overloaded method signature, the symbiotic invocation fails. It is then the AmbientTalk programmer' | If the Java method is overloaded based on arity (i.e. each overloaded method takes a different number of arguments), the number of arguments in the AmbientTalk invocation can be used to identify a unique Java method. Hence, overloading based on arity does not require special attention. If the Java method is overloaded based solely on argument types, the interpreter may derive that the actual arguments can only be converted from AmbientTalk to the appropriate Java types for one of the matching overloaded signatures. Again, if only one match remains, the unique match is invoked. In the remaining case in which the actual AmbientTalk arguments satisfy more than one overloaded method signature, the symbiotic invocation fails. It is then the AmbientTalk programmer' | ||
- | Selection of the correct overloaded method is done using the **cast** method. | + | Selection of the correct overloaded method is done using the **cast** method. |
< | < | ||
- | > | + | >def remove := aVector.remove |
- | >> | + | >>< |
+ | >remove.cast(jlobby.java.lang.Integer.TYPE)(0) | ||
+ | >>1 | ||
>aVector | >aVector | ||
- | >> | + | >>< |
- | >aVector.remove.cast(jlobby.java.lang.Object)(3) | + | > |
>> | >> | ||
>aVector | >aVector | ||
- | >> | + | >>< |
</ | </ | ||
Line 79: | Line 81: | ||
def showSymbiosis() { | def showSymbiosis() { | ||
- | def javaDemo := SymbiosisDemo.new(); | + | |
- | def atObject := object: { | + | |
- | def ping() { | + | def ping() { |
- | system.println(" | + | system.println(" |
- | javaDemo.run2(self); | + | javaDemo.run2(self); |
- | }; | + | }; |
- | def pong() { | + | def pong() { |
- | system.println(" | + | system.println(" |
- | 42 | + | 42 |
- | } | + | } |
- | }; | + | }; |
- | javaDemo.run(atObject); | + | |
}; | }; | ||
Line 121: | Line 123: | ||
If Java invokes a method declared in an interface with an overloaded method signature, all overloaded invocations are transformed into the same method invocation on the AmbientTalk object. In other words, the AmbientTalk object does not take the types into consideration. However, if the Java method is overloaded based on arity, the AmbientTalk programmer can take this into account in the parameter list of the corresponding AmbientTalk method, by means of a variable-argument list or optional parameters. Otherwise, the Java invocation may fail because of an arity mismatch. | If Java invokes a method declared in an interface with an overloaded method signature, all overloaded invocations are transformed into the same method invocation on the AmbientTalk object. In other words, the AmbientTalk object does not take the types into consideration. However, if the Java method is overloaded based on arity, the AmbientTalk programmer can take this into account in the parameter list of the corresponding AmbientTalk method, by means of a variable-argument list or optional parameters. Otherwise, the Java invocation may fail because of an arity mismatch. | ||
+ | |||
+ | < | ||
+ | >def test := / | ||
+ | >>< | ||
+ | > | ||
+ | ping! | ||
+ | pong! | ||
+ | >>42 | ||
+ | </ |
at/tutorial/symbiosis.txt · Last modified: 2013/05/17 20:25 by tvcutsem