How do I prevent the modification of a private field in a class?

Question

Imagine that I have this class:

public class Test
{
  private String[] arr = new String[]{\"1\",\"2\"};    

  public String[] getArr() 
  {
    return arr;
         


        

Answer 1

If you can use a List instead of an array, Collections provides an unmodifiable list:

public List getList() {
    return Collections.unmodifiableList(list);
}