public class FastHashMap
{
    public static class Loader extends Thread
    {
        private int                   from;
        private int                   to;
        private HashMap<Long, String> data;

        public Loader( final HashMap<Long, String> data, int from, int to )
        {
            this.data = data;
            this.from = from;
            this.to   = to;
            start();
        }
        @Override
        public void run()
        {
            for( int i=from;i<=to;i++) {
                data.put( new Long(i), "#" + String.valueOf( i ) );
            }
        }
    }

    public static void main(String[] args)
    {
        HashMap<Long, String> data = new HashMap<Long, String>();
        new Loader( data, 1, 150 );
        new Loader( data, 100, 200 );

        try { Thread.sleep( 3000 ); } catch (InterruptedException noCare) {}

        System.out.println( data.size() );
        int miss = 0;
        for( int i=1;i<=200;i++)
        {
            if( !data.containsKey( new Long(i) ) ) miss++;
        }
        System.out.println( miss );
    }

}