java - Would changes be visible to a different thread if synchronizing using different objects? -


imagine piece of code inside class. trying change val value in different threads calling method1 , method2, respectively.

is expected changes made val visible in thread, if using different objects synchronize on? , test case design?

private object lock1 = new object(); private object lock2 = new object(); private int val = 0;  public void method1 () {     synchronized (lock1) {        system.out.println(val);        val = 1;     } }  public void method2 () {     synchronized (lock2) {        system.out.println(val);        val = 2;     } }

there no happens-before relation between acquiring , releasing different monitors, there no guarantee when changes visible.


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