public class MathsParser
{
    public MathsParser (boolean debug)
    {
        _debug = debug;
    }

    private boolean _debug;
}
import java.util.*;

public class MathsParser
{
    public MathsParser (boolean debug)
    {
        _debug = debug;
    }

    public int parse (Vector<String> data)
    {
        return -1;
    }

    private boolean _debug;
}
Update MathsParser.java