13 java synchronized block java thread synchronization
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java synchronized block: a deep dive into thread synchronization
in multithreaded java applications, multiple threads often access and modify shared resources. without proper synchronization, this can lead to race conditions, data corruption, and unpredictable behavior. java provides the `synchronized` keyword to ensure thread safety and prevent these issues. the `synchronized` keyword can be used in two main ways:
1. *synchronized methods:* applying `synchronized` to a method makes the entire method atomic, meaning only one thread can execute it at a time.
2. *synchronized blocks:* this allows you to synchronize only specific sections of code within a method, offering finer-grained control over synchronization and potentially improving performance.
this tutorial will focus on **synchronized blocks**, exploring their syntax, usage, benefits, and best practices with detailed code examples.
*1. understanding the need for synchronization*
consider a simple counter class:
in this example, two threads (`t1` and `t2`) concurrently increment the `count` variable. the `increment()` method appears simple, but `count++` is actually a composite operation involving:
1. reading the value of `count`.
2. incrementing the value.
3. writing the new value back to `count`.
if two threads execute these steps concurrently, the following scenario can occur:
thread 1 reads `count` (e.g., `count = 5`).
thread 2 reads `count` (still `count = 5`).
thread 1 increments `count` to 6 and writes it back.
thread 2 increments `count` to 6 (instead of 7) and writes it back.
as a result, one increment is lost, leading to an incorrect final count. this is a classic race condition.
*2. introducing synchronized blocks*
a synchronized block in java has the following structure:
*`synchronized (object)`:* this is the key. the `synchronized` keyword is followed by parentheses containing a reference to an object. this object acts as a lock or *monito ...
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