4. A single-slot buffer may be modelled by: ONEBUF = (put-> get-> ONEBUF). Program a Java class, OneBuf, that implements this one-slot buffer as a monitor. 5. Replace the condition synchronization in your implementation of the one-slot buffer Question 4) by using semaphores. Given that Java defines assignment to scalar types (with the exception of long and double) and reference types to be atomic, does your revised implementation require to use of the monitor's mutual exclusion lock