How to backup ArrayList in Java?

Question

I have some data stored as ArrayList. And when I want to backup this data,java bounds two objects forever. Which means when I change values in data ArrayL

Answer 1

I haven't tried it yet, but I think Collections.copy will do that.

[EDIT] Now, I tried:

static String GetRandomString(int length)
{
  UUID uuid = UUID.randomUUID();
  return uuid.toString().substring(0, length);  
}

public static void main(String[] args)
{
  ArrayList al = new ArrayList(20);
  for (int i = 0; i < 10; i++)
  {
    al.add(GetRandomString(7));
  }
  ArrayList cloneArray = new ArrayList(al);
  Collections.copy(cloneArray, al);
  System.out.println(al);
  System.out.println(cloneArray);
  for (int i = 9; i >= 0; i -= 2)
  {
    al.remove(i);
  }
  System.out.println(al);
  System.out.println(cloneArray);
}