6-1 Duplicated Words (20分)

java旧题复习
6-1 Duplicated Words (20分)
This program reads a lot of words, in which may be duplicated words. The program picks out all the duplicated ones and sorts the remainders in a descendent order.

函数接口定义：
public static ArrayList pick(ArrayList a);
a is the ArrayList to be parsed and returns the result as an ArrayList.

裁判测试程序样例：

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.Scanner;

public class Main {
    /* 请在这里填写答案 */

    public static void main(String[] args) {
        ArrayList<String> lst = new ArrayList<>();
        Scanner in = new Scanner(System.in);
        while ( in.hasNext() ) {
            lst.add(in.next());
        }
        lst = pick(lst);
        for ( String x:lst) {
            System.out.print(x+" ");
        }
        System.out.println();
        in.close();
    }
}

输入样例：

this is a test at this Zhejiang University

输出样例：

this test is at a Zhejiang University 

ans：

public static ArrayList<String> pick(ArrayList<String> a){
		ArrayList<String> list=new ArrayList<>();
		
		for(int i=0;i<a.size();i++) {
			if(list.contains(a.get(i))==false) {
				list.add(a.get(i));
			}
		}
		Collections.sort(list);
		Collections.reverse(list);
		return list;
	}

最后

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