How to use Java's join method

1. Test 1

Use the following command to run the above program:

java mythread.JoinThread

The running results of the program are as follows:

n=442

This running result may have some differences in different running environments, but generally n will not equal 1000. From the above results, we can be sure that n is output before all 100 threads are executed.

2. Test 2

Use the following command to run the above code:

There is a parameter join in the above command line. In fact, you can use any Parameters, as long as there is one parameter, join is used here just to indicate that the join method is used to synchronize the execution of these 100 threads.

The running result of the program is as follows:

n=1000

No matter what operating environment you run the above command, you will get the same result: n=1000. This fully demonstrates that all 100 threads must have been executed, therefore, n must be equal to 1000.

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