solve in java please

Part II - Process synchronization Write a program that consists in 4 threads that must be executed in a specific order (see the graph). Task 1 Task 3 Task Task 2 4 Task 3 cannot be started before EITHER Task 1 or Task 2 ends Task 4 can be started only after Task 2 AND Task 3 end. [Note]: We mean by Task l; a thread that prints "TASKI COMPLETED on screen. Use SEMAPHORES to solve this