gavioto gavioto - 5 months ago 11
Java Question

How to convert from Object to Double[]

I have an object in Java 8 that is really an object array contaning Double objects. I need to check (using instanceof) and get the values. But I always get an error trying to convert to Object[] or Double[].

This is the variable in Eclipse expressions

enter image description here

I get this exception when running the code

Object position = whitelist.get("code").get("position");
if(position!=null){
feature.setGeometry(new Point(((Double []) position)[0],((Double []) position)[1]));
}



java.lang.ClassCastException: java.util.ArrayList cannot be cast to [Ljava.lang.Object;


But it works on ideone.com:



<script src="http://ideone.com/e.js/J2ZJSV" type="text/javascript" ></script>





Edit: my own answer...

Answer

whitelist.get("code").get("position") apparently returns an ArrayList containing Double objects.

You can therefore simply write:

List<Double> position = (List<Double>)whitelist.get("code").get("position");
if (position!=null)
     feature.setGeometry(new Point(position.get(0),position.get(1)));
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