Read List<Pair> from JSON with Jackson
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Read List<Pair<Double, Double>> from JSON with Jackson
How can I read a List<Pair<Double, Double>> from JSON, using Jackson, into a class instance’s field of type List<Pair<Double, Double>>:
List<Pair<Double, Double>>
List<Pair<Double, Double>>
if(jsonNode.get(“arrayListPair”).isArray())
for (JsonNode objNode: jsonNode.get(“arrayListPair”))
// how to convert objNode to Pair<Double, Double>
Sample, as requested:
"arrayListPair" : [ [1.2, 3.4], [5.6, 7.8] ]
Thanks
Can you provide us your JSON ?
– Emre Savcı
Aug 12 at 8:40
Just added above, thanks
– shanlodh
Aug 12 at 8:43
So, the arrayListPair node is an array node. You need to iterate though its elements (fasterxml.github.io/jackson-databind/javadoc/2.9/com/fasterxml/…). For each element, which is also an array, you need to get the node at index 0 and the node at index 1 (fasterxml.github.io/jackson-databind/javadoc/2.9/com/fasterxml/…), Then you need to get each of these two values as a double (fasterxml.github.io/jackson-databind/javadoc/2.9/com/fasterxml/…).
– JB Nizet
Aug 12 at 9:00
I've never used that low-level Jackson API, but by reading the javadoc, I can know how to use it. That's why the javadoc exists. Read it.
– JB Nizet
Aug 12 at 9:01
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We have no idea, because you didn't say what your JSON looked like. We can't read your screen.
– JB Nizet
Aug 12 at 8:38