I don't know what it is that you are trying to archive? If you want to remove the duplicate strings you might want to use a java.util.Set instance instead of an array. A set does not allow duplicates.

Well to answer your question:

String [] myStrings = {"a", "b", "c", "b", "d"};
Set mySet = new java.util.TreeSet();

for (int i=0; i  if (mySet.add(myStrings[i]) {
    // myStrings[i] is not a duplicate
  } else {
    // myStrings[i] is a duplicate
  }
}

// now you have a Set containing only unique strings.