Volatile identifier in java

Question

I do not understand the few statements that I read:

since access to a mutable variable never blocks, this is not suitable for cases when we want to read-update-write as atomic (if we are not ready to "skip updating");

What does it mean, I can’t read-update-write?

When I want to use volatile instead of a simple boolean. In C #, I remember that I could use a simple static bool to control when a thread starts and stops, but in java I need to use the identifier "volatile":

> public class StoppableTask extends Thread {
  private volatile boolean pleaseStop;

  public void run() {
    while (!pleaseStop) {
      // do some stuff...
    }
  }

  public void tellMeToStop() {
    pleaseStop = true;
  }
}

Answer 1

The sentence talks about this example:

public class CounterClass {
   private volatile int counter;

   public int increment() {
       return counter++;
   }
}

counter volatile, , increment(), . counter++ . get, increment, return. , increment() get, get, increment.

: volatile - . , . .

Answer 2

volatile

FWIW volatile:

• ( "" )
• ( " " )
• "volatile bean"
• ( " " )

---

, :

ready . , , , --

• : Java.

  " ready, . , , . , , Thread 1, , Thread 2 , true ready."