Adding a double element to a vector

[peachyco]

Hello, everybody.

I'm trying to compile this code, but I'm getting an error telling me that the addElement method of java.util.Vector can't be applied to (double).

Code:

import java.io.*;
import java.util.*;

public class Tester
{
	
	//MAIN METHOD
	public static void main(String[] args)
	{
		
		BufferedInputStream bis = null;
		double custNum = 0;
		String custInfo = null;
		Vector[] vector = new Vector[2];
		
		for (int x = 0; x < vector.length; x++)
			vector[x] = new Vector(10,5);
		
		try
		{
			bis = new BufferedInputStream(new FileInputStream("customer_records.txt"));
			StreamTokenizer st = new StreamTokenizer(bis);
			
			//Java Tokenizing Declarations
			st.wordChars('_', '_');
			st.eolIsSignificant(true);
			st.ordinaryChars(0, ' ');
			
			int token = st.nextToken();
			while (token != StreamTokenizer.TT_EOF)
			{
				token = st.nextToken();
				switch (token)
				{
					case StreamTokenizer.TT_NUMBER:
						vector[0].addElement(st.nval);
					
						if (!custInfo.equals(null))
							vector[1].addElement(custInfo);
					
						custInfo = null;
						break;
						
					default:
						custInfo += st.sval + "\n";
						break;
						
				}//end switch
			}//end while
			
			//Print the contents here
			
		}//end try
		
		catch (IOException ioe)
		{
			ioe.printStackTrace();
			System.exit(1);
		}//end catch
		
		finally
		{
			try
			{
				if (bis != null) bis.close();
			}//end try
			
			catch (IOException ioe)
			{
				ioe.printStackTrace();
				System.exit(1);
			}//end catch
			
		}//end finally
		
	}//end main
	
}//end class Tester

I feel I'm just missing sumthing pretty obvious, but for the n00b I am, I can't see it! Please help. Thanx a lot in advance!

[Zensai]

Vector <Type> Name = new Vector <Type> ();
why you are using a vector by the way? it is out of fashion. use arraylist

[peachyco]

Thanks anyway for the help.

I'm using vector right now 'coz that's what we're told to use.

Anyways, I found the problem out. A vector can't work with primitives, just like ArrayLists. I had to wrap the double up before appending it to the vector.

Code:

vector[0].addElement(new Double(st.nval));

I'm having more problems now that I've finished compiling and am actually running the program, but that's for another thread.

[hardwired]

Vector can take an Object such as Double but not a primitive data type such as double. So wrap your double value in a Double.

Code:

vector[0].addElement(Double.valueOf(st.nval));

[peachyco]

Yeah, Double.valueOf() is also working. Thanks for that. But, is there any significant difference between *new Double()* and *Double.valueOf()* ?

[hardwired]

is there any significant difference between *new Double()* and *Double.valueOf()*
The place to resolve these kind of discriminating queries is the javadocs. Look up the constructor and the method you've quoted in the Double class api, follow the links of each to their descriptions in the Method Detail section and you will find a definitive answer.