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test55.java
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54 lines (47 loc) · 1.21 KB
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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
}