Java thread (7): Thread Scheduling-sleep

Java thread: Thread Scheduling-sleep Java thread scheduling is the core of Java multithreading. Only good scheduling can give full play to system performance and improve program execution efficiency. It should be clear that no matter how programmers write scheduling, they can only influence the thread execution order to the maximum extent, but cannot implement precise control. The thread sleep is one of the simplest ways to make the thread out of the CPU. When the thread sleep, the CPU resources are handed over to other threads so that the thread can be rotated for execution. When the thread sleep for a certain period of time, the thread will wake up and enter the preparation status to wait for execution. The Thread sleep methods are Thread. sleep (long millis) and Thread. sleep (long millis, int nanos). They are static methods. Which Thread does the sleep call? Simply put, the thread that calls sleep will sleep. /*** Java thread: Thread Scheduling-sleep ** @ author leizhimin 9:02:40 */public class Test {public static void main (String [] args) {Thread t1 = new MyThread1 (); Thread t2 = new Thread (new MyRunnable (); t1.start (); t2.start ();}} class MyThread1 extends Thread {public void run () {for (int I = 0; I <3; I ++) {System. out. println ("thread 1" + I + "times! "); Try {Thread. sleep (50);} catch (InterruptedException e) {e. printStackTrace () ;}}} class MyRunnable implements Runnable {public void run () {for (int I = 0; I <3; I ++) {System. out. println ("thread 2" + I + "times! "); Try {Thread. sleep (50);} catch (InterruptedException e) {e. printStackTrace () ;}}} Thread 2 0th executions! Thread 1 executes 0th times! Thread 1 executes 1st times! Thread 2, 1st executions! Thread 1 executes 2nd times! Thread 2, 2nd executions! Process finished with exit code 0 can be seen from the output above that the thread execution order cannot be accurately guaranteed.