Rearrange index on array

Question

Is it possible to re-arrange indexes on arrays? Lets say String myArray [] = {"a","b","c","d"} and rearrange the indexes to acbd as the output, sorry for the noob question.

Answer 1

you need a temp variable

temp =myarray[1]
myarray[1] = myarray[2]
myarray[2] = temp

Answer 2

Use a temporary variable.

String temp = myarray[1];
myarray[1] = myarray[2];
myarray[2] = temp;

If memory is a big issue you can set it to null afterwards (temp = null;), but this usually isn't a problem.

Answer 3

If you want to reorder elements in Java it's best to do it with Lists. For example you can write

List<String> list = new ArrayList<String>(Arrays.asList("a", "b", "c", "d", "e"));
Collections.rotate(list.subList(1, 4), 1);
System.out.println("" + list);

and the output is [a, d, b, c, e]. Doing this kind of thing with arrays is much harder.