Does java support generic method support all kinds of argument input?

Question

I wanna code some method for hystrix default fallback methods, for example:

//declaration
public void voidDefaultFallback(generic argument list) {
    return;
}

public int intDefaultFallback(generic argument list) {
    return 0;
}

public Object nullDefaultFallback(generic argument list) {
    return null;
}
//invocation
nullDefaultFallback("a", "b");
nullDefaultFallback("a", 0);
nullDefaultFallback("a", 0, "abc");

does java support such generic method?

I'm not clear understand what you exactly mean by `generic argument list`. Your examples could be described by several ways: `K, V...`, `K...` — ZhenyaM, Jul 25 '18 at 09:21
Possible duplicate of [Java variable number or arguments for a method](https://stackoverflow.com/questions/2330942/java-variable-number-or-arguments-for-a-method) — juzraai, Jul 25 '18 at 09:21

score 3 · Answer 1 · answered Jul 25 '18 at 09:20

3

Yes, you can do that with this argument in method

public void method (Object ... objects){
        for(Object obj : objects){
            //do stuff
        }
    }

It's called varargs , you can find more info here

answered Jul 25 '18 at 09:20

Leviand

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score 0 · Answer 2 · answered Jul 25 '18 at 09:21

0

You can always use

nullDefaultFallback(Object...args);

answered Jul 25 '18 at 09:21

Antoniossss

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score 0 · Answer 3 · answered Jul 25 '18 at 09:23

For different return types with same method names you need to specify different method signatures. For example:

public void m(K...) {...}
public int m(K...) {...}

is not valid case, but, for example:

public void m(K){...}
public int m(K, K) {...}

will work fine

Does java support generic method support all kinds of argument input?

3 Answers3