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Dealing with HashMap objects #488

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ArnoldCell opened this issue May 1, 2018 · 2 comments
Open

Dealing with HashMap objects #488

ArnoldCell opened this issue May 1, 2018 · 2 comments

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@ArnoldCell
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@ArnoldCell ArnoldCell commented May 1, 2018

I am trying to print the values of an object with a type of
HashMap<String, Long>

When I try to use obj.get(someString) i get an error:
TypeError: undefined not callable (property 'get' of [object Object])

When i'm trying to cast the object with Java.cast()
i get an invalid argument value error.

How can i handle an object type of HashMap?

@b1naryxx
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@b1naryxx b1naryxx commented Jul 17, 2018

well i really dont know how to iterate it yet but my workaround to at least be able to print it using console.log is

var HashMap = Java.use("java.util.HashMap");
var c = Java.cast(b,HashMap);

where b is the [Object object] thats is supposed to be a hashmap object.

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@GregChan
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@GregChan GregChan commented May 7, 2019

Commenting in case anyone else encounters issues with this. I've found using Java iterators the best way to print keys/values of a HashMap. Assuming you have a hashmap variable already, you can do something like this:

var HashMapNode = Java.use('java.util.HashMap$Node');

var iterator = hashmap.entrySet().iterator();
while (iterator.hasNext()) {
  var entry = Java.cast(iterator.next(), HashMapNode);
  console.log(entry.getKey());
  console.log(entry.getValue());
}

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3 participants