Use Arrays.asList to convert array to list : Array Reflection Utilities « Collections « Java Tutorial

1. Java Tutorial
2. Collections
3. Array Reflection Utilities

import java.util.Arrays;
import java.util.List;
import java.util.ListIterator;

public class MainClass {
  static void listTrim(List<String> strings) {
    for (ListIterator<String> lit = strings.listIterator(); lit.hasNext();) {
      lit.set(lit.next().trim());
    }
  }

  public static void main(String[] args) {
    List<String> l = Arrays.asList(" red ", " white ", " blue ");
    listTrim(l);
    for (String s : l) {
      System.out.format("\"%s\"%n", s);
    }
  }
}