A java thread is an execution context or a lightweight process. It is a single sequential flow of control within a program. Programmer may use java thread mechanism to execute multiple tasks at the same time. In Java Programming language, thread is a sequential path of code execution within a program. Each thread has its own local variables, program counter and lifetime. In single threaded runtime environment, operations are executes sequentially i.e. next operation can execute only when the previous one is complete. It exists in a common memory space and can share both data and code of a program. Threading concept is very important in Java through which we can increase the speed of any application.
In Java, every thread begins by executing a run() method in a particular object. Run() is declared to be public, takes no arguments, has no return value, and is not allowed to throw any exceptions. Any class can implement a run() method by declaring that the class implements the Runnable interface.
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