java - Shared data between clients in socket -

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If I have class A and 2 threads from class B, and I think the thread is in class A to variable X I want to reach i a thread manipulates that variable, how does the thread of the first value of x get the second thread?

For example 

  public class A {public static x = 0; Public static zero manipulation {x ++; }}

and for example class B: 

  executes the public class B. Runnable {Public is run from zero (a.manipulate); }}

If I run 2 threads, then from 1st to x will be set, and second set x to 2, is that correct? If not true, how do I?


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