Java Thread Exception Handling: An In-depth Study and Guide

This assignment delves into the intricacies of Java thread exception handling, exploring how exceptions are managed within the context of multithreading. It begins by explaining the nature of exceptions in Java and the mechanisms for catching them using exception handlers, emphasizing the importance of strategic placement for effective error management. The assignment then outlines the lifecycle of a thread, including states such as New, Runnable, Blocked, Waiting, Timed_Waiting, and Terminated, providing a comprehensive understanding of thread behavior. The core of the assignment focuses on the implementation of a thread using the Runnable interface and the Thread class, detailing the creation, starting, and management of threads. It also explains the use of methods like start() and run(), as well as Thread.currentThread().sleep() for controlling thread execution and introducing delays. The assignment's overall goal is to provide a solid understanding of how to handle exceptions in a multithreaded Java environment, which is critical for developing robust and reliable applications.

Thread exception in Java
Exceptions are the events that occur due to the programmer error or
machine error which causes a disturbance in the normal flow of execution of
the program. When a method encounters an abnormal condition that it can
not handle, an exception is thrown as an exception statement. Exceptions
are caught by handlers(here catch block). Exceptions are caught by handlers
positioned along with the thread’s method invocation stack. If the calling
method is not prepared to catch the exception, it throws the exception up to
its calling method and so on. So in the java program exception handlers
should be positioned strategically, so the program catches all the exception
from which the program want to recover.
Lifecycle of a thread: The class implements a Thread class or Runnable
interface then the extended class has start() method run the thread, sleep()
methods cause the currently executing thread to sleep for the specified
number of milliseconds, and many more.
Prior to discussing the approaches, state. transactions of thread should be
known to further deal with exceptions for better understanding. A thread in
Java at any point in time exists in any one of the following states. A thread
lies only in one of the shown states at any instant:
1. New
2. Runnable
3. Blocked

4. Waiting
5. Timed Waiting
6. Terminated
1. A class name RunnableThread implements the Runnable interface
which gives the run( ) method executed by the thread. The object of this
class is now runnable
2. The Thread constructor is used to create an object of RunnableThread
class by passing the runnable object as a parameter.
3. The start() method is invoked on the Thread object as it returns
immediately once a thread has been spawned.
4. The thread ends when the run( ) method ends which is to be normal
termination or caught exception.
5. Now in order to create a new thread
runner = new Thread(this,threadName) ;
6. In order to start the new thread.
runner. start() ;
7. public void run( ) is an overrideable method used to display the
information of a particular thread.
8. Thread.currentThread().sleep(2000) is used to deactivate the thread until
the next thread started execution or used to delay the current thread.