It is possible in Java for an individual program to simultaneously perform more than
one task, or thread. All the programs discussed in this book so far implicitly use just one
thread. Such a program is described as single threaded. Threads cannot exist independently;
they always exist within the context of a program. A Java program can have any number
of associated threads that are created explicitly; if a program has more than one associ-
ated thread, it is said to be multithreaded. Threads are sometimes described as execution
contexts.
It is possible to delay execution ...
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