How to implement a Least Frequently Used (LFU) cache in Java?

1. Create a class for the LFU cache and implement the LRU interface. 2. Create two hash maps: one to store the data, and one to store the frequency information. 3. Add a method to put an element in the cache. - Create an entry in the data cache with key and value. - Create an entry in the frequency map. If the key already exists, increment the value by 1, else set the value of the key as 1. 4. Add a method to get an element from the cache. - If the given key exists, retrieve it from the data cache, and increment the corresponding entry in the frequency map. - If the key does not exist, return null. 5. Add a method to remove the least recently used entry from the cache. - Iterate through the frequency map and find the least frequently used entry. - Remove the corresponding entry from the data cache and from the frequency map. 6. Add a method to clear the entire cache. - Clear both the data cache and the frequency map.
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