LEETCODE 2022 Added solution for lru-cache #41

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HaskSy wants to merge 1 commit into master from LEETCODE-lru-cache

src/leetcode/design.md

-Original file line number
+Diff line change
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-    # Design
+    # Design
+    + [LRU Cache](#lru-cache)
+    ## LRU Cache
+    https://leetcode.com/problems/lru-cache/
+    ```java
+    class LRUCache {
+        private final LinkedHashMap<Integer, Integer> cache = new LinkedHashMap<>();
+        private final int capacity;
+        public LRUCache(int capacity) {
+            this.capacity = capacity;
+        }
+        public int get(int key) {
+            if (!cache.containsKey(key)) {
+                return -1;
+            }
+            update(key);
+            return cache.get(key);
+        }
+        public void put(int key, int value) {
+            if (cache.containsKey(key)) {
+                cache.put(key, value);
+                update(key);
+                return;
+            }
+            if (cache.size() >= this.capacity) {
+                int del = cache.keySet().iterator().next();
+                cache.remove(del);
+            }
+            cache.put(key, value);
+        }
+        public void update(int key) {
+            int val = cache.get(key);
+            cache.remove(key);
+            cache.put(key, val);
+        }
+    }
+    ```

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