Simple IntIO

public class IntIO extends BufferedInputStream
{
    public IntIO(final InputStream in)
    {
        super(in);
    }

    public IntIO(final InputStream in, final int buf_size)
    {
        super(in, buf_size);
    }

    public int getInt() throws IOException
    {
        int chr = read();
        while(chr<=' ') chr = read();
        int sum = chr-'0';
        while((chr = read())>' ') sum = (sum<<3)+sum+sum + chr-'0';
        return sum;
    }
}