public class BasicThreads {
    // This top-level nested class implements Runnable, because when
    // you construct a Thread object it will expect to get an object
    // which promises to be runnable, i.e., that has a "run" method
    //
    private static class Printer implements Runnable {
        private String name;
       
        Printer(String name) {
            this.name = name;
        }
       
        public void run() {                          // must implement "run"
            for(int i = 0; i < 10; i++) {            // print 0 -- 9
                System.out.println(name + ": " + i); // prefix output with name
            }
        }
    }
   
    public static void main(String[] args) {
        // Create two threads that run Printers with different names
        Thread t1 = new Thread(new Printer("a"));
        Thread t2 = new Thread(new Printer("b"));

        // Start both threads
        t1.start();
        t2.start();

        // Wait for both threads to finish
        try {
            t1.join();
            t2.join();
        } catch(InterruptedException e) {
            System.out.println("Interrupted");
        }
        System.out.println("Done");
    }
}