In JAVA please

What is the language's key high-level synchronization construct - i.e., the synchronization construct intended for most developers to use? How does it relate to monitors as we defined them in class? How could you implement a class satisfying the monitor's fundamental mutual exclusion property - that is, a class whose instantiated objects ensured mutual exclusion among their methods? Could you mutually exclude critical sections smaller than an entire method without resorting to mutex locks? If so, how? How would you implement condition variables as we described them in class? Does the implementation differ if you need more than one condition variable? If so, how? Does the language provide additional synchronization-related functionality? In brief, what? What is the language's key high-level synchronization construct - i.e., the synchronization construct intended for most developers to use? How does it relate to monitors as we defined them in class? How could you implement a class satisfying the monitor's fundamental mutual exclusion property - that is, a class whose instantiated objects ensured mutual exclusion among their methods? Could you mutually exclude critical sections smaller than an entire method without resorting to mutex locks? If so, how? How would you implement condition variables as we described them in class? Does the implementation differ if you need more than one condition variable? If so, how? Does the language provide additional synchronization-related functionality? In brief, what