How does Java handle multithreading?

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Java handles multithreading by allowing multiple threads of execution to run concurrently within a program. A thread is the smallest unit of execution, and Java provides built-in support through the java.lang.Thread class and the Runnable interface.

When a Java program starts, it runs on the main thread, and additional threads can be created to perform tasks simultaneously, improving performance, responsiveness, and resource utilization.

There are two primary ways to create a thread:

  1. Extending Thread class and overriding the run() method.

  2. Implementing Runnable interface and passing it to a Thread object.

Java also provides Executors (Thread Pools) from the java.util.concurrent package to manage multiple threads efficiently without manually handling creation and termination.

Threads can communicate and coordinate using synchronization mechanisms such as synchronized blocks, methods, locks, and semaphores to avoid race conditions and ensure thread safety.

Important concepts include:

  • Lifecycle of a thread: New → Runnable → Running → Waiting/Blocked → Terminated.

  • Thread priorities to suggest scheduling order.

  • Inter-thread communication via wait(), notify(), and notifyAll().

  • Concurrency utilities like CountDownLatch, CyclicBarrier, and ConcurrentHashMap.

Thus, Java’s multithreading model, combined with its concurrency APIs, enables efficient, parallel execution of tasks, making applications faster, responsive, and scalable.

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