package com.itranswarp.learnjava;

import java.util.*;

/**

* Learn Java from https://www.liaoxuefeng.com/

*

* @author liaoxuefeng

*/

public class Main {

public static void main(String[] args) {

List<Student> list = List.of(new Student("Bob", 78), new Student("Alice", 85), new Student("Brush", 66),

new Student("Newton", 99));

var holder = new Students(list);

System.out.println(holder.getScore("Bob") == 78 ? "yes" : "no");

System.out.println(holder.getScore("Alice") == 85 ? "yes" : "no");

System.out.println(holder.getScore("Tom") == -1 ? "yes" : "no");

}

}

class Students {

List<Student> list;

Map<String, Integer> cache;

Students(List<Student> list) {

this.list = list;

cache = new HashMap<>();

}

int getScore(String name) {

// 先在Map中查找:

Integer score = this.cache.get(name);

if (score == null) {

// TODO:

score = findInList(name);

this.cache.put(name, score);

}

return score == null ? -1 : score.intValue();

}

Integer findInList(String name) {

for (var ss : this.list) {

if (ss.name.equals(name)) {

return ss.score;

}

}

return null;

}

}

class Student {

String name;

int score;

Student(String name, int score) {

this.name = name;

this.score = score;

}

}