// Project: Multithreading
// Source code file: Main.java
// Show how to use threads to add numbers in parallel.
// A class that implements Runnable can be run in a thread.

public class Main {
    public static void main(String[] args) throws InterruptedException {

        // Create three Adder objects to run in parallel.
        Adder a1 = new Adder(0, 10000);
        Adder a2 = new Adder(10000, 20000);
        Adder a3 = new Adder(20000, 30000);
        Adder a4 = new Adder(30000, 40000);

        // Create three threads in which to run
        // the three Adder objects.
        Thread t1 = new Thread(a1);
        Thread t2 = new Thread(a2);
        Thread t3 = new Thread(a3);
        Thread t4 = new Thread(a4);

        // Start the threads
        System.out.println("Start threads");
        t1.start( );
        t2.start( );
        t3.start( );
        t4.start( );

        // Block until all threads have finished.
        t1.join( );
        t2.join( );
        t3.join( );
        t4.join( );
        System.out.println("All threads finished.");

        System.out.println("Grand sum: " +
                (a1.getTotal( ) + a2.getTotal( ) +
                        a3.getTotal( ) + a4.getTotal( )));
    }
}