/** 
 * This class demonstrates the use of concurrent processes.
 * An incrementer simply increments a shared variable.
 * 
 * @author Scot Drysdale
 */
public class Incrementer extends Thread {
  private static int shared;  // A variable shared by all incrementers
  
  private String myName;        // The name of the incrementer
  
  /**
   * Create an incrementer with a given name
   * @name the name of the incrementer
   */
  public Incrementer(String name) {
  	myName = name;
  }
  
  /**
   * Thing to do when started
   */
  public void run() {
    shared = shared + 1;
    int temp = shared;
    System.out.println(myName + " incremented shared value " + shared);
    shared = temp + 1;
    System.out.println(myName + " incremented shared value again " + shared);
  }
  
  public static void main(String [] args) {
  	Incrementer inc1 = new Incrementer("first");
  	Incrementer inc2 = new Incrementer("second");
  	
  	shared = 0;
  	
  	try {
    	inc1.start();
    	inc2.start();
    	inc1.join();
    	inc2.join();
  	}
  	catch(InterruptedException e){
  		System.err.println("Exception: " + e.getMessage());
  	}
  	
  	System.out.println("shared at end = " + shared);
  }
}