import java.util.ArrayList;
import java.util.concurrent.atomic.AtomicInteger;

public class ThreadSafeIntegerIncrementTestClass
{
    volatile static int simpleInt = 0;
    static AtomicInteger atomicInteger = new AtomicInteger(0);
    static int synchronizedGetterInteger = 0;

    public synchronized static void syncronizedIncrementer()
    {
        synchronizedGetterInteger++;
    }

    public static void main(final String... args) throws InterruptedException
    {
        class IncrementerThread extends Thread implements Runnable
        {
            @Override
            public void run()
            {
                for(int i = 0 ; i<1000; i++)
                {
                    ThreadSafeIntegerIncrementTestClass.simpleInt++;
                    ThreadSafeIntegerIncrementTestClass.atomicInteger.incrementAndGet();
                    ThreadSafeIntegerIncrementTestClass.syncronizedIncrementer();
                }
            }
        }

        final ArrayList<IncrementerThread> threadList = new ArrayList<IncrementerThread>();

        for(int i = 0; i<1000; i++)
            threadList.add(new IncrementerThread());
        for(final IncrementerThread currentThread : threadList)
            currentThread.start();
        for(final IncrementerThread currentThread : threadList)
            currentThread.join();

        System.out.println(simpleInt);
        System.out.println(atomicInteger);
        System.out.println(synchronizedGetterInteger);
    }
}