I am breaking this up into multiple parts to be easier to write, and hopefully get a full program by putting the parts together. This question has been asked before, but the answers are all incomplete.

Please write this in Java.

Design and implement a Demand Paging virtual memory simulator! It must be a text based application (NOT a GUI based one). The following algorithms must be implemented: FIFO, OPT, LRU and LFU. The application must simulate the execution of each of these algorithms on a hypothetical computer having only N physical frames (numbered from 0 to N-1, N<8), assuming that the single process that is running has a virtual memory of ten frames (numbered from 0 to 9). The number N should be a number provided in the command line as an argument. The algorithms will be simulated based on a reference string (a sequence of pages that are to be accessed) that will be either read from the keyboard or randomly generated.

7 Simulate LFU

Will simulate the step by step execution of the LFU algorithm using the stored reference string; if there is no reference string stored yet, an error message must be displayed. The user will press a key after each step of the simulation to continue the simulation. The total number of faults will be displayed at the end of the simulation.