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

You can also use ImmutableList which should be better than the standard unmodifiableList. The class is part of Guava libraries that was create by Google.

Here is the description:

Unlike Collections.unmodifiableList(java.util.List), which is a view of a separate collection that can still change, an instance of ImmutableList contains its own private data and will never change

Here is a simple example of how to use it:

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

  public ImmutableList getArr() 
  {
    return ImmutableList.copyOf(arr);
  }
}