The java.util.LinkedHashMap class is a subclass of the standard HashMap class that retains the expected O(1) performance for the primary map operations while guaranteeing that iterations report entries of the map according to first-in, firstout (FIFO) principle. That is, the key that has been in the map the longest is reported first. (The order is unaffected when the value for an existing key is changed.) Describe an algorithmic approach for achieving such performance.