Map of method arguments in Java [duplicate]

Question

Is there any way by which we can retrieve all the arguments/parameters of a method inside that method in a Map with key as parameter name and value as parameter value?

Say, I have a method with below signature:

public void do(String arg1, int arg2, String arg3, Double arg4, MyCustomObj arg5)

I want to achieve something like this:

public void do(String arg1, int arg2, String arg3, Double arg4, MyCustomObj arg5) { Map<String, Object> argsMap = <what-goes-here>; logger.info("do ENTRY: "+argsMap); }

PS: I am not looking for a solution based on AOP. I want something that can be used within the method itself.

Update: This question is not about how to get values via Reflection. Please re-read before marking it as duplicate.

You mean, the parameters to the current method, from inside that method? — tobias_k
– tobias_k, Commented Jul 13, 2015 at 10:16
Take a look at: How to get the value of a method argument via reflection in Java? — Tobías
– Tobías, Commented Jul 13, 2015 at 10:23

SMA · Accepted Answer · 2015-07-13 10:22:26Z

0

This seems to be a candidate of AOP and with spring where you could apply before advice, create your own map and print it.

answered Jul 13, 2015 at 10:22

SMA

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4 Comments

biziclop Over a year ago

You'd still have to create the map manually.

SMA Over a year ago

Yes but it would be within advice and you just need to define it once like: @Before(..) ..mymethod(..) { create map of args and send it to console and then proceed with normal routine?

biziclop Over a year ago

I may be wrong but I think the question is about how to "magically" obtain the parameters of a method in map form.

SMA Over a year ago

Then that's worse! thanks @biziclop

chengpohi · Accepted Answer · 2015-07-13 10:25:07Z

0

You can use Varargs:

public void function(String... parameters) {
    for (int i = 0; i < parameters.length; i += 2) {
        System.out.println(parameters[i] + " " + parameters[i + 1]);
    }
}

answered Jul 13, 2015 at 10:25

chengpohi

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