D:\java FindDups1 i came i saw i left 对象集合(Set Duplicate:i Duplicate:i java.util.Hash$4 distinct words:[came,left,saw,il ■无序集合 D import java.util.*; public class SetDemo1 public static void main(String args[]){ Set s new HashSet(); for (int i=0;i<args.length;i++) if (!s.add(args[i])) System.out.println("Duplicate:"+args[i]); System.out.println(s.size()+"distinct words:"+s); 88 ◼ java.util.HashSet implement java.util.Set ◼ 无序集合 对象集合(Set) import java.util.*; public class SetDemo1 { public static void main(String args[]) { Set s = new HashSet(); for (int i=0; i<args.length; i++) if (!s.add(args[i])) System.out.println("Duplicate: "+args[i]); System.out.println(s.size()+" distinct words: "+s); } } D:\java FindDups1 i came i saw i left Duplicate: i Duplicate: i 4 distinct words: [came, left, saw, i] D:\