Java 集合转换为数组

import java.util.*;

public class CollectionToArray {
   public static void main(String[] args) {
      List<String> list = new ArrayList<String>();
      list.add("This ");
      list.add("is ");
      list.add("a ");
      list.add("good ");
      list.add("program.");
      String[] s1 = list.toArray(new String[0]);

      for(int i = 0; i< s1.length; ++i) {
         String contents = s1[i];
         System.out.print(contents);
      }
   }
}