AtomicLong counter = new AtomicLong(0); long currentValue = counter.longValue(); System.out.println("Current value of counter: " + currentValue);
AtomicLong timestamp = new AtomicLong(System.currentTimeMillis()); long previousValue = timestamp.getAndSet(System.currentTimeMillis()); System.out.println("Previous value of timestamp: " + previousValue); System.out.println("Current value of timestamp: " + timestamp.longValue());In this example, we create an AtomicLong variable "timestamp" with an initial value of the current system time in milliseconds. We then use the getAndSet() method to atomically set the new value of the variable and return its previous value. We print the previous value and the new value of the variable to the console. The java.util.concurrent.atomic package library can be determined by looking at the package declaration in the code, which is "import java.util.concurrent.atomic.AtomicLong;" in our examples.