IsNumber function

From:
Salad <oil@vinegar.com>
Newsgroups:
comp.lang.java.help
Date:
Fri, 10 Apr 2009 16:23:00 -0700
Message-ID:
<r_CdnepqNtpLSULUnZ2dnUVZ_q2dnZ2d@earthlink.com>
I'm just beginning. I didn't find a IsNumeric() or IsNumber() method so
I wrote my own. The method can take a string, number or boolean and
determine if it's a number or not (I didn't check for chars). Could you
take a look at it and tell me what I can change that makes it easier to
use? I would prefer if I could use a format like
    boolean b = IsNumber("123");
    b = IsNumber("Mary");
    b = IsNumber("123.0")

public class IsNumberTest
    //test the method
    {
    public static void main(String args[])
        {

        //string alpha
        String strVar = "Mary";
        IsNumber test = new IsNumber(strVar);
        System.out.println("The value is " + test.getNumber());

        //string numeric
        strVar = "123";
        test = new IsNumber(strVar);
        System.out.println("The value is " + test.getNumber());

        //int
        int intVar = 123;
        test = new IsNumber(intVar);
        System.out.println("The value is " + test.getNumber());

        //double
        double dblVar = 123.00;
        test = new IsNumber(dblVar);
        System.out.println("The value is " + test.getNumber());

        //boolean
        boolean boolVar = true;
        test = new IsNumber(boolVar);
        System.out.println("The value is " + test.getNumber());
            }
    }

//checks if the value passed is a number or not
public class IsNumber
{
    private boolean returnval;

    //start constructiors
    public IsNumber(float passed)
        {
            isNumber(true);
        }

    public IsNumber(double passed)
        {
            isNumber(true);
        }

    public IsNumber(long passed)
        {
            isNumber(true);
        }

    public IsNumber(int passed)
        {
            isNumber(true);
        }

    public IsNumber(short passed)
        {
            isNumber(true);
        }

    public IsNumber(byte passed)
        {
            isNumber(true);
        }

    public IsNumber(boolean passed)
        {
            isNumber(false);
        }

    public IsNumber(String passed)
        {
        try
            {
             Double.parseDouble( passed );
            isNumber(true);
            }
        catch( Exception e )
            {
                isNumber(false);
            }
        }
    //end constructors

    public void isNumber(boolean tf)
        {
            returnval = tf;
        }

    public boolean getNumber()
        {
            return returnval;
        }

}

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