/**
 * how to create a thread, version 4
 * @author mh, inspired by [Oechsle 2018]
 *
 */

class MyThread extends Thread { 	// pattern of behaviour

    private String name;
    final int MAX = 10;

    public MyThread (String name) { 
		this.name = name;
    } // constructor

    public void run() {			// the actual code to be executed
		for (int i = 0; i<MAX; i++) {
	  		System.out.println(name + ": " + i);
//	  		Simulate.waitForSomething();
			try {
				sleep(100); // don't compete for processing time for 100 ms = 0.1 s
			} catch (Exception e) {} 
    	} // for
    } // run

} // class Process


public class ThreadDemo4 {   

    public static void main (String[] argv) {

	Thread a = new MyThread("A");	// create process instances
	Thread b = new MyThread("B");
//	Thread c = new MyThread("C");
    
    System.out.println(" -- begin of ThreadDemo4 -- ");

        a.start();		// start of the execution -> process
        b.start();
//        c.start();

	try {
            b.join();			// Wait for this thread to end
            a.join(); 
//            c.join(); 
        } catch (Exception e) {} 

        System.out.println(" -- end of ThreadDemo4 -- ");

    } // main

} // class ThreadDemo1


class Simulate {

    public static void waitForSomething() {
        if (Math.random()<0.5) {
            try { Thread.sleep(200);} catch(InterruptedException e){};
            // used instead of Thread.yield() to ensure portability
        } // if
    } // waitForSomething 

} // class Simulate