Array Store Exception using array copy

Question

I'm making a method in which I require to copy an array to another.

public void rotate (int movements){
  SuperList<T> temp = new SuperList<> ();
  if( movements != size ){
     for( int i = 0; i < size - movements; i++){
        temp.add( i, (T) (get( movements + i ))); 
        //System.out.println(i + movements);
     }
     for( int j = 0; j < movements; j++)
        temp.add( temp.size(), ( T ) (get( j )));
     System.arraycopy(temp, 0, this, 0, size);
  }
}

but when I execute it appears:

Exception in thread "main" java.lang.ArrayStoreException
at java.lang.System.arraycopy(Native Method)
at unal.datastructures.SuperList.rotate(SuperList.java:42)
at unal.datastructures.SuperList.main(SuperList.java:65)

Why is your if condition stating if( movements != size ).? . Where is size.? — user2339071
– user2339071, Commented Sep 28, 2013 at 6:39

Mureinik · Accepted Answer · 2013-09-28 19:23:26Z

1

System.arraycopy copies between two arrays - you are applying it to two instances of SuperList, which is a collection (implements List, presumably).

answered Sep 28, 2013 at 19:23

Mureinik

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2 Comments

Laura Over a year ago

SuperList extends from ArrayLinearList, in ArrayLinearList is implemented System.arraycopy and it works properly.

Mureinik Over a year ago

Assuming you mean this, you are using it wrong. ArrayLinearList uses System.arraycopy to copy its element data member, which is indeed an array (of T). It does not apply it to object references such as this or temp like you have in the code snippet you enclosed.

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