1006 Sign In and Sign Out (25 分)
利用Collections中sort方法
代码:
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());
}
}