1006 Sign In and Sign Out （25 分）

利用Collections中sort方法
程式碼：

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Scanner;


public class Main {
 

	
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner scan = new Scanner(System.in);
		Map<String,String> a = new HashMap<String,String>();
		Map<String,String> b = new HashMap<String,String>();
		int n = scan.nextInt();
		for (int i = 0; i <
 
 n; i++) {
			String s = scan.next();
			String s1 = scan.next();
			String s2 = scan.nextLine();
			a.put(s, s1);
			b.put(s, s2);
		}
		List<Map.Entry<String, String>> list = new ArrayList<Map.Entry<String,String>>(a.entrySet());
		Collections.sort(list, new Comparator<Map.
 
Entry<String, String>>() {
			@Override
			public int compare(Entry<String, String> o1, Entry<String, String> o2) {
				return o1.getValue().compareTo(o2.getValue());
			}
		});
//		for (Map.Entry<String, String> map:list) {
//			System.out.println(map.getKey()+":"+map.getValue());
//		}
		System.out.print(list.get(0).getKey()+" ");
		List<Map.Entry<String, String>> list1 = new ArrayList<Map.Entry<String,String>>(b.entrySet());
		Collections.sort(list1, new Comparator<Map.Entry<String, String>>() {
			@Override
			public int compare(Entry<String, String> o1, Entry<String, String> o2) {
				return -o1.getValue().compareTo(o2.getValue());
			}
		});
//		for (Map.Entry<String, String> map:list1) {
//			System.out.println(map.getKey()+":"+map.getValue());
//		}
		System.out.println(list1.get(0).getKey());
		
	}
}