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Core Java™ 2 Volume II - Advanced Features, Seventh Edition by Gary Cornell, Cay S. Horstmann

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Synchronization

In most practical multithreaded applications, two or more threads need to share access to the same objects. What happens if two threads have access to the same object and each calls a method that modifies the state of the object? As you might imagine, the threads can step on each other's toes. Depending on the order in which the data were accessed, corrupted objects can result. Such a situation is often called a race condition.

An Example of a Race Condition

To avoid corruption of shared data by multiple threads, you must learn how to synchronize the access. In this section, you'll see what happens if you do not use synchronization. In the next section, you'll see how to synchronize data access.

In the next test program, we simulate ...

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