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Answer Posted / javamasque
Threads are lightweight process which lives inside process. These are independently running programs which have concurrent path of execution. Each thread has its own 1. Java stack 2. Program counter and 3. Native stack but have common heap space. Multiple threads with in same process share same variables and objects. They allocates objects from same heap and even they can share same instructions (execution code) at particular time. As a result above common access they can easily share information to each other.
Every program has at least one thread i.e. main thread. JVM creates main thread which calls main method to execute whole program. The main thread is non-daemon thread. Any thread created by main method is non-daemon thread by default.
JVM has daemon threads for garbage collection, object finalization and other housekeeping jobs.
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