Sample code for J2EE threads

This article will explain in detail the sample code about J2EE threads. The editor thinks it is very practical, so I share it with you for reference. I hope you can get something after reading this article.

J2EE thread:

Public class TT implements Runnable {int b = 100; public synchronized void M1 () throws Exception {/ / Thread.sleep (2000); b = 1000; Thread.sleep (5000); System.out.println ("b =" + b);} public synchronized void m2 () throws Exception {Thread.sleep (2500); b = 2000; System.out.println (b);} public void run () {try {M1 () } catch (Exception e) {e.printStackTrace ();}} public static void main (String [] args) throws Exception {TT tt = new TT (); Thread t = new Thread (tt); t.start (); tt.m2 (); System.out.println (tt.b);}}

Function running result: 2000

2000

B = 1000

Function analysis: in the main function, start a thread, that is, the run method of the thread is run, the M1 method is called in the run method, and the m2 method is called in the main main thread at the same time, note that m2 locks the object at this time, so even if there is a sleep method in m2, M1 thread can not run until the end of m2.

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