Big data-java Foundation-8day

Process

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1. Processes are isolated in memory (memory is not shared).

two。 Communication between processes is through socket, which is also needed on the same computer.

Thread

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1. A block of code that executes concurrently during program execution.

two。 Memory is shared between threads.

3. A process must have at least one thread (the main thread).

4.Thread: thread class.

Start (); / / notifies cpu that you can start executing the thread.

The block of code that the run (); / / thread actually executes. The method has no return value and no parameters.

Thread t = new Thread (); / / create a thread.

T.start (); / / run.

5.Thread.currentThread (); gets the currently executing thread.

6.yield (); / / waive the preemption right of cpu

7.sleep (int mils) / / hibernates the current thread for the specified number of milliseconds.

8.join (); / / wait for the specified thread to finish

9.Thread.setDaemon (true); / / daemon thread. Must be set before the thread starts.

10.synchronozed (lock) {.} / / synchronize the code block.

Producers and consumers

Notify: randomly notifies a thread in the waiting queue.

NotifyAll: notifies all threads in the waiting queue.