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java built-in monitor objects: a deep dive with examples

java's built-in monitor objects provide a fundamental mechanism for achieving thread synchronization and mutual exclusion. they enable you to protect shared resources from concurrent access, preventing race conditions and ensuring data integrity. this tutorial will provide a comprehensive overview of monitor objects, their underlying principles, usage, and a motivating example with code.

*1. what are monitor objects?*

a monitor is a programming language construct designed to control concurrent access to shared data. java's built-in monitor objects are intrinsically linked to every object in the language. this means every java object can act as a monitor.

key characteristics of monitor objects:

*mutual exclusion:* only one thread at a time can execute code inside the monitor. this prevents multiple threads from accessing and modifying shared data simultaneously, which could lead to inconsistent or corrupted data.

*condition variables:* monitors provide condition variables that allow threads to temporarily relinquish control of the monitor and wait for a specific condition to become true. other threads can then signal these waiting threads when the condition is met.

*2. core concepts & keywords*

to use java's built-in monitor objects, you need to understand the following core concepts and keywords:

*`synchronized` keyword:* this is the primary mechanism for acquiring and releasing the monitor lock associated with an object. you can use `synchronized` in two ways:

*synchronized methods:* when you declare a method as `synchronized`, a thread must acquire the monitor lock of the object the method is invoked on before it can execute the method's code. the lock is automatically released when the method completes (either normally or by throwing an exception).

*synchronized blocks:* you can use a `synchronized` block to synchronize a specific section ...

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Java monitor objects
synchronization
thread safety
intrinsic locks
wait and notify
concurrency control
Java concurrency
synchronized methods
monitor pattern
object locking
inter-thread communication
Java threading
critical section
deadlock prevention
Java multithreading