Threads: Java allows you to create and manage multiple threads of execution using the Thread class or the Runnable interface. Threads can be created by extending the Thread class or implementing the Runnable interface and using the Thread constructor.
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Thread Synchronization: Java provides synchronization mechanisms to coordinate access to shared resources among multiple threads. This prevents data races and ensures thread safety. The most commonly used mechanism is the synchronized keyword, which can be applied to methods or blocks of code to ensure exclusive access to the synchronized region by only one thread at a time.
Thread Safety: Java provides various thread-safe data structures and classes in the java.util.concurrent package, such as ConcurrentHashMap, ConcurrentLinkedQueue, and Atomic* classes. These classes are designed to handle concurrent access without the need for explicit synchronization.
Thread Pooling: Java's Executor framework allows you to manage a pool of worker threads for executing tasks concurrently. The ExecutorService interface provides methods for submitting tasks, managing their execution, and obtaining results.
Locks: The java.util.concurrent.locks package provides explicit locks, such as ReentrantLock, ReadWriteLock, and Lock interfaces. These locks offer more flexibility than synchronized blocks, allowing you to have more control over locking and unlocking, as well as supporting advanced features like fairness and condition variables.
Volatile Keyword: The volatile keyword in Java ensures that a variable is read from and written to the main memory, rather than being cached by individual threads. It provides a lightweight form of synchronization suitable for some specific use cases.
Thread Intercommunication: Java provides mechanisms for intercommunication and coordination between threads, such as the wait(), notify(), and notifyAll() methods of the Object class. These methods are used in conjunction with the synchronized keyword to implement efficient thread synchronization.
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Concurrent Collections: Java provides thread-safe collections in the java.util.concurrent packages, such as ConcurrentHashMap, ConcurrentLinkedQueue, and CopyOnWriteArrayList. These collections can be safely accessed and modified concurrently by multiple threads.
Atomic Operations: Java provides atomic classes in the java.util.concurrent.atomic packages, such as AtomicInteger, AtomicLong, and AtomicReference. These classes offer atomic operations without the need for explicit locking, ensuring thread-safe updates to variables.
Java's concurrency utilities and language constructs provide a powerful framework for writing multi-threaded and synchronized code, allowing developers to efficiently utilize parallelism and manage concurrent access to shared resources.
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