public class SheepManager {
private int sheepCount = 0;
private void incrementAndReport() {
synchronized(this) {
System.out.print((++sheepCount)+" ");
}
}
public static void main(String[] args) {
ExecutorService service = null;
try {
service = Executors.newFixedThreadPool(20);
SheepManager manager = new SheepManager();
for(int i=0; i<10; i++)
service.submit(() -> manager.incrementAndReport());
} finally {
if(service != null) service.shutdown();
}
}