Java Thread Lifecycle
Understanding the Java Thread Lifecycle
Java Thread Lifecycle
The Java Thread Lifecycle encompasses various states that a thread can be in, specifically: New, Runnable, Blocked, Waiting, Timed Waiting, and Terminated. When a thread is created, it starts in the New state and transitions to Runnable when the `start()` method is invoked. In the Runnable state, a thread may be scheduled by the thread scheduler to execute; however, it can move to the Blocked state if it attempts to acquire a lock held by another thread. A thread can enter the Waiting state when it waits for another thread to perform a particular action, or into Timed Waiting when it waits for a specified amount of time. Finally, when the run method completes or is terminated, the thread transitions to the Terminated state. Understanding this lifecycle is crucial for effective multithreaded programming, as it helps manage resource allocation, synchronization, and overall thread behavior.
To Download Our Brochure: https://www.justacademy.co/download-brochure-for-free
Message us for more information: +91 9987184296
1 - New State: When a thread is created using the `Thread` class or by implementing the `Runnable` interface, it is in the “New” state. In this state, the thread has not yet started execution.
2) Runnable State: After calling the `start()` method on a thread, it enters the “Runnable” state. In this state, the thread is eligible to run but may not be executing due to CPU scheduling.
3) Blocked State: A thread can enter the “Blocked” state when it tries to acquire a lock on an object that is currently held by another thread. It waits until the lock becomes available.
4) Waiting State: In the “Waiting” state, a thread is waiting for some other thread to perform a particular action, such as notifying it. This can occur through methods like `Object.wait()`, `Thread.join()`, or `LockSupport.park()`.
5) Timed Waiting State: Similar to the Waiting state, the Timed Waiting state occurs when a thread is waiting for another thread to perform an action for a specified time. Methods like `Thread.sleep(milliseconds)` and `Object.wait(milliseconds)` can put a thread in this state.
6) Terminated State: A thread enters the “Terminated” state when it has completed its execution, either by returning from the `run()` method or by throwing an uncaught exception. This state also indicates that the thread is no longer alive and cannot be restarted.
7) Thread Priorities: Each thread in Java has a priority that helps the thread scheduler determine the order of thread execution. Priorities range from `Thread.MIN_PRIORITY` (1) to `Thread.MAX_PRIORITY` (10), with `Thread.NORM_PRIORITY` (5) being the default.
8) Thread Scheduling: The Java thread scheduler decides when each thread gets a chance to run. This is based on thread priorities and the underlying operating system's scheduling policy, which can be either preemptive or cooperative.
9) Synchronization: Java provides synchronization capabilities to avoid thread interference and memory consistency errors. Threads can synchronize on an object’s monitor, ensuring that only one thread runs a synchronized block at a time.
10) Thread Lifecycle Methods: Important methods include:
`start()`: Begins the thread's execution.
`run()`: Defines the code that the thread will execute.
`sleep()`: Makes the thread pause for a specified time.
`join()`: Causes the current thread to wait until the target thread finishes.
11) Daemon Threads: These are low priority threads that run in the background and are used for tasks such as garbage collection. When only daemon threads remain, the Java Virtual Machine (JVM) will exit.
12) Interruptible Methods: Threads can be interrupted by calling the `interrupt()` method. Methods like `Thread.sleep()`, `wait()`, and `join()` can throw `InterruptedException` if the thread is interrupted while waiting.
13) Thread States Diagram: Understanding the lifecycle visual representation is valuable. It helps students grasp transitions between the various states (New, Runnable, Blocked, Waiting, Timed Waiting, and Terminated).
14) Thread Pools: Using `ExecutorService`, developers can manage a pool of threads, which helps reuse threads for executing tasks, rather than creating and destroying them, promoting better resource management.
15) Best Practices: Discussing best practices for multi threading, including avoiding deadlocks, minimizing synchronization scope, using concurrent utilities, and properly handling thread interruptions.
By covering these points in your training program, students will gain a thorough understanding of the Java Thread Lifecycle and essential concepts surrounding multi threading in Java.
Browse our course links : https://www.justacademy.co/all-courses
To Join our FREE DEMO Session: Click Here
Contact Us for more info:
- Message us on Whatsapp: +91 9987184296
- Email id: info@justacademy.co
Android App Development Course Fees in Chennai
python developer certification
