Collection  ├List  │├LinkedList  │├ArrayList  │└Vector  │　└Stack  └Set 

import java.util.ArrayList; import java.util.Collections; import java.util.List;  public class TestCollections {      public static void main(String args[]) {     //注意List是實現(xiàn)Collection接口的     List list = new ArrayList();     double array[] = { 112, 111, 23, 456, 231 };     for (int i = 0; i < array.length; i++) {       list.add(new Double(array[i]));     }     Collections.sort(list);     for (int i = 0; i < array.length; i++) {       System.out.println(list.get(i));     }     // 結(jié)果：23 111 112 231 456   } }