The 8th Week of Java Programming Study summary 20165218 2017-2018-1

20165218 2017-2018-1 "Java Program Design" 8th Week study Summary Textbook Learning summary Chapter 12th Java multithreading mechanism threads in Java

• a computer can execute only one thread at any given time , and a multithreaded mechanism is a way for a Java virtual machine to quickly switch threads and make them take turns
• ThreadThe object representing the class and its subclasses represents the thread
• One life cycle of a thread has four states of new, running, Interrupted, dead
• setPriority(int grade)method to adjust Thread priority

Common Methods of threading

• start()Only new state threads can call the
• run()Without specific content, the user program needs to create its own subclass of the thread class, overriding the run() method; after execution, the thread dies
• sleep(int millsecond)Call causes a high-priority thread to temporarily enter hibernation; try-catch
• isAlive()When the thread is in the new and dead state, the method returns false and is in a running state, returningtrue
• currentThread()Returns the thread that is using CPU resources
• interrupt()The thread used to "wake up" The method was called sleep

Thread synchronization

Using the synchronized -Modified method, you follow the synchronization mechanism: When a thread a uses the Synchronized method, other threads must wait until thread A is finished using the method.

Reconciling threads for synchronization

• wait()Method can be executed in the thread break, temporarily let the CPU use
• wait()Method must be notifyAll() awakened by method
• wait()method, notify() which notifyAll() is the final method in the object class , is not allowed to be overridden

Thread Federation

//线程A在使用CPU资源的期间B.join();

A interrupts immediately until thread B finishes executing

Code Hosting

(run result of statistics.sh script)

Last week's summary of the wrong quiz

• Wrong question 1

Connection is the class name is not a method name

• Wrong question 2

• ...

Resources

• Java Learning Notes (8th Edition)

• Java Learning Note (8th Edition) Learning Guide

• Database Operation language

The 8th Week of Java Programming Study summary 20165218 2017-2018-1