1) Implement HashMap in Java, with the put and get operations HashMap can be implemented in Java Using Arrays. Use the same logic that the Out of the Box HashMap follows, for resizing, and load factor, when ever the HashMap reaches the size of the resize with the load factor a new Array is created, and the previous array contents are copied over to the new Array. HashMap is Not Synchronized by default. We can synchronize the whole map by using Synchronization, or by using collection.synchronizedmap(map), which synchronizes all the operations on the map. Alternatively We can use the CocurrentHashMap which does not lock the read operations, rather locks the segments that are being written. 2) HashMap vs LinkedHashMap vs IdentityHashMap 3) HashMap vs ConcurrentHashMap 4) Implement a Cache using LinkedHashMap
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