class Printer {

private int currentNumber = 1;

private int maxNumber;

public Printer(int maxNumber) {

this.maxNumber = maxNumber;

}

public synchronized void print() {

while (currentNumber <= maxNumber) {

System.out.println(" printed: " + currentNumber);

currentNumber++;

}

}

}

class PrintTask implements Runnable {

private Printer printer;

public PrintTask(Printer printer) {

this.printer = printer;

}

@Override

public void run() {

printer.print();

}

}

public class PrintNumbers {

public static void main(String[] args) {

Printer printer = new Printer(10);

Thread thread1 = new Thread(new PrintTask(printer));

Thread thread2 = new Thread(new PrintTask(printer));

thread1.start();

thread2.start();

}

}