Question

I want to convert an array from one type to another. As shown below, I loop over all objects in the first array and cast them to the 2nd array type.

But is this the best way to do it? Is there a way that doesn’t require looping and casting each item?

public MySubtype[] convertType(MyObject[] myObjectArray){
   MySubtype[] subtypeArray = new MySubtype[myObjectArray.length];

   for(int x=0; x < myObjectArray.length; x++){
      subtypeArray[x] = (MySubtype)myObjectArray[x];
   }

   return subtypeArray;
}

Answer 1

You should be able to use something like this:

Arrays.copyOf(myObjectArray, myObjectArray.length, MySubtype[].class);

However this may just be looping and casting under the hood anyway.

See here.