Difference Between Start And Run Method In Java
distinguishing between start and run method in Java
Difference Between Start And Run Method In Java
In Java, the start() method is used to initialize a new thread and then calls the run() method to start the execution of the thread. The run() method contains the code that defines the task to be performed by the thread. Invoking the run() method directly does not create a new thread, rather it executes the code in the current thread's context. The start() method, on the other hand, creates a new thread and then calls the run() method on that new thread to execute the code. It's important to always call the start() method to begin the execution of a thread to ensure proper thread management and concurrency.
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1 - The start() method is used to start a new thread and then invokes the run() method on that newly created thread. On the other hand, the run() method contains the actual code or task that the thread will execute.
2) The start() method is a non blocking method, meaning it does not wait for the thread to complete its task and returns immediately. Conversely, the run() method is a blocking method, as it will execute the task sequentially on the current thread.
3) If you call the run() method directly, it will be executed on the current thread, essentially behaving like a regular method call. The start() method is necessary to create a new thread and run the task concurrently.
4) Using the start() method ensures that the Java Virtual Machine (JVM) can manage multiple threads efficiently by scheduling their execution. It allows for parallel processing and improves performance in multi threaded applications.
5) The start() method should be called only once per thread, as attempting to start the same thread multiple times will result in an IllegalThreadStateException. In contrast, you can call the run() method multiple times as it just runs the task on the current thread.
6) The start() method is typically used in multi threading scenarios where you need to perform tasks concurrently, while the run() method might be used in situations where you want to execute a task sequentially or within the same thread.
7) When you call the start() method, it triggers the thread lifecycle, including calling the run() method internally. This separation of concerns helps in managing thread states and allows for proper synchronization and coordination.
8) In summary, the start() method is the entry point for creating and starting a new thread, while the run() method is where the actual task logic resides. Understanding the distinction between these methods is crucial for developing efficient and scalable multi threaded applications.
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