Solved

padding longs

Posted on 2012-04-05
7
296 Views
Last Modified: 2012-04-05
I am doing some math using longs which will yield numbers like 5, 10, 20, etc
but I always need to pad the result to be 3 digits.
What's the best way to do that?
0
Comment
Question by:dpalyca755
  • 3
  • 3
7 Comments
 
LVL 14

Assisted Solution

by:CPColin
CPColin earned 334 total points
ID: 37814127
Using zeros in a DecimalFormat will work:

new DecimalFormat("000").format(x);

Open in new window

0
 
LVL 23

Assisted Solution

by:wdosanjos
wdosanjos earned 166 total points
ID: 37814135
Use the DecimalFormat class.  Here is an example:
import java.text.*;

public class Test
{
    public static void main(String args[])
    {
        DecimalFormat formatter = new DecimalFormat("000");
        long nbr = 50;

        String fmt_nbr = formatter.format(nbr);

        System.out.println(fmt_nbr);
        
        /*
        
        Output:
        
        050
        
        */
     }
}

Open in new window

0
 

Author Comment

by:dpalyca755
ID: 37814190
Can I use the String Format method to do so?
What is the syntax if do so?
let's say the 5 I referenced earlier is stored in the variable myString.
0
Windows Server 2016: All you need to know

Learn about Hyper-V features that increase functionality and usability of Microsoft Windows Server 2016. Also, throughout this eBook, you’ll find some basic PowerShell examples that will help you leverage the scripts in your environments!

 
LVL 14

Accepted Solution

by:
CPColin earned 334 total points
ID: 37814211
Assuming you have a long, it would be something like this:

String.format("%03d", myLong);

Open in new window


The "0" means "pad with zeros," the "3" means "make the output three characters wide," and the "d" means "output a number."
0
 

Author Comment

by:dpalyca755
ID: 37814296
I can't compile that for some reason.
I tried that exact line too.
What am I doing wrong?

Code Snippet:
long c = 5;
String pad2 = String.format("%03d", c);        
---------------------------------------------------------------------------
Error:
test.java:51: cannot resolve symbol
symbol  : method format (java.lang.String,long)
location: class java.lang.String
             String pad2 = String.format("%03d", c);
                                 ^
1 error
0
 
LVL 14

Expert Comment

by:CPColin
ID: 37814319
I've only seen that happen when using a version of Java older than 1.5 or when I've told the compiler to pretend like its from an old version of Java. Do you know if that's happening?
0
 

Author Comment

by:dpalyca755
ID: 37814330
Yup....I was accidentally pointing to an older version.
I fixed it.  Works now.
Thanks.
0

Featured Post

Efficient way to get backups off site to Azure

This user guide provides instructions on how to deploy and configure both a StoneFly Scale Out NAS Enterprise Cloud Drive virtual machine and Veeam Cloud Connect in the Microsoft Azure Cloud.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Java contains several comparison operators (e.g., <, <=, >, >=, ==, !=) that allow you to compare primitive values. However, these operators cannot be used to compare the contents of objects. Interface Comparable is used to allow objects of a cl…
Are you developing a Java application and want to create Excel Spreadsheets? You have come to the right place, this article will describe how you can create Excel Spreadsheets from a Java Application. For the purposes of this article, I will be u…
Viewers will learn about basic arrays, how to declare them, and how to use them. Introduction and definition: Declare an array and cover the syntax of declaring them: Initialize every index in the created array: Example/Features of a basic arr…
This tutorial explains how to use the VisualVM tool for the Java platform application. This video goes into detail on the Threads, Sampler, and Profiler tabs.

772 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question