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package byteDance;

import java.util.LinkedHashMap;

import java.util.Map;

/**

* @Author:lizeyang

* @Date:2020/5/23 17:13

* function:LRU实现，美团面试耻辱！！！

*/

public class test55 {

//方法一：LinkedhashMap实现

int capacity;

Map<Integer, Integer> map;

test55(int capacity) {

this.capacity = capacity;

map = new LinkedHashMap<Integer, Integer>();

}

public void put(int key, int value) {

if (map.containsKey(key)) {

map.remove(key);

map.put(key, value);

return;

}

map.put(key, value);

if (map.size() > capacity) {

map.remove(map.entrySet().iterator().next().getKey());

}

}

public int get(int key) {

if (!map.containsKey(key)) {

return -1;

}

int value = map.remove(key);

map.put(key, value);

return value;

}

public static void main(String[] args) {

test55 test = new test55(3);

test.put(1,2);

test.put(2,3);

test.put(3,4);

test.put(4,5);

System.out.println(test.get(2));

test.put(5,6);

System.out.println(test.get(2));

}

//方法二见test56

}