VL-Programmieren/VL14/Aufgabe01/Counter.java

package VL14.Aufgabe01;

/**
 * Class representing a counter.
 *
 * @author Sebastian Brosch
 */
public class Counter implements Runnable {
  static int counter;

  // some information of the counter.
  private int number;

  /**
   * Create a new counter with initializing the start value.
   *
   * @param number The number to increment or decrement the counter.
   * @param start  The start value of the counter.
   */
  public Counter(int number, int start) {
    this(number);
    counter = start;
  }

  /**
   * Create a new counter without initializing the start value.
   *
   * @param number The number to increment or decrement the counter.
   */
  public Counter(int number) {
    this.number = number;
  }

  /**
   * Method to run some code in a Thread.
   */
  public void run() {
    while (counter > 0 && counter < 1000) {
      this.count();
    }
  }

  /**
   * Method to increment or decrement the counter.
   */
  private void count() {
    synchronized (getClass()) {
      counter += this.number;
      System.out.printf("%3d [%s: %3d]\n", counter, Thread.currentThread().getName(), this.number);
    }
  }
}