Wrapper to String

Kernel_Killer · 03-06-2005, 01:31 PM

I'm trying to convert a wrapper back to string, but for some reason I can't seem to get my variable to drop into my method correctly. Here's what I have:

Conversion.java (Java Class File)

Code:

/*
 * Conversion.java
 *
 * Created on March 2, 2005, 6:38 PM
 */

package Chapter6Project1;


public class Conversion 
{
    
    /** Creates a new instance of Conversion */
    public Conversion() 
    {
    }  
    
    public Integer stringToInteger1(String s) throws Exception 
    {
        int i = Integer.parseInt(s);    
            
        Integer iwResult = new Integer(i);
        
        System.out.println(i);
        return iwResult;
    }
    
    public Double stringToDouble1(String t) throws Exception
    {
        double d = Double.parseDouble(t);
        
        Double iwResult2 = new Double(d);
        
        System.out.println(d);
        return iwResult2;
    }
    
    public String wrapperToString(Integer u) throws Exception
    {
        
        String str = u.toString();
        String iwResult3 = new String(str);
        System.out.println("test " + str + iwResult3 + u);
       // String iwResult3 = toString(sresult);
        return iwResult3;
    }
    
}

ConversionTester.java (Main)

Code:

package Chapter6Project1;

public class ConversionTester
{
    public ConversionTester()
    {
        
    }

    public static void main(String[] args) throws Exception
    {
            Conversion aConversion = new Conversion();
            aConversion.stringToInteger1("5");
            aConversion.stringToDouble1("5.5");
            aConversion.wrapperToString("6");
           // aConversion.wrapperToString("8");
            Integer u = new Integer("6");
            
    }
}

As you can see, I can pass the Integer and Double through thier methods, but for some reason the wrapperToString method I can't exactly pass and Integer through (hence the commented out aConversion statement in the ConversionTester file).

TIA

Belisarius · 03-06-2005, 02:02 PM

In wrapperToString, where do you define "sresult"? Also, you don't define the method "toString" anywhere. As an Object, it inherits a "toString()" method, one that doesn't take any arguments.

Additionally, you don't need to do all those method calls just to turn a String into an Integer or Double. Both of those objects take a String for a constructor.

Kernel_Killer · 03-06-2005, 07:09 PM

Whoops. Sorry about that, didn't put my latest version of that last method.

Code:

public String wrapperToString(Integer u) throws Exception
{
          String str = u.toString();
          String iwResult3 - new String(str);
          System.out.println(str);
          return iwResult3;
}

I'm at a lost. I checked the Java Doc on toString, and I'm not quite sure what I'm missing. Surely it's how I'm pushing it into the method? I guess I should do it a bit different from my primitive data types to string methods?

Kernel_Killer · 03-06-2005, 08:11 PM

Ok. Got it.

Code:

package Chapter6Project1;

public class ConversionTester
{
    public ConversionTester()
    {
        
    }

    public static void main(String[] args) throws Exception
    {
            Conversion aConversion = new Conversion();
            aConversion.stringToInteger1("5");
            aConversion.stringToDouble1("5.5");
            Integer u = new Integer(6);
            aConversion.wrapperToString(u);
    }
}

I had to put my Integer statement before, and then pass the variable as a variable to the aConversion instead of a straight int variable.

Thanx Bel.