HashSet用法实例

在hashset中存入字符并输出

import java.util.HashSet;
import java.util.Iterator;
import java.util.Scanner;
import java.util.Set;

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/**
 *
 * @author Administrator
 */
public class HashTest {
    public static void main(String[] args){
        Set words = new HashSet<String>();
        long totaltime = 0;

        Scanner in =new Scanner(System.in);

        while(in.hasNext()){
            String word =in.next();
            if (word.equals("exit")) {
                break;
            }
            long callTime =System.currentTimeMillis();
            words.add(word);
            callTime =System.currentTimeMillis()-callTime;
            totaltime+=callTime;
           
            }
       System.out.println("///////////////////////////////////////");
        Iterator<String> it=words.iterator();
            while (it.hasNext()) {
                System.out.println(it.next());
              
        }
         System.out.println("Time:"+totaltime);
    }
}