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how to format a number as ###,### in JSP/Java

Posted on 2007-11-16
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How to format a number as ###,###

I have the following code


 <%
    DecimalFormat df = new DecimalFormat("###,###");
    long MySourceBytes = df.format((MyList.get(i).getSourceBytes())/1024);
 %>

Now I have the following error

An error occurred at line: 367 in the jsp file: /view2.jsp
Generated servlet error:
C:\Documents and Settings\ezchen\.netbeans\5.5\apache-tomcat-5.5.17_base\work\Catalina\localhost\NFD\org\apache\jsp\view2_jsp.java:644: incompatible types
found   : java.lang.String
required: long
            long MySourceBytes = df.format((MyList.get(i).getSourceBytes())/1024);
                                          ^

How to fix this problem?
0
Comment
Question by:wasabi3689
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6 Comments
 
LVL 27

Expert Comment

by:mrcoffee365
ID: 20303317
df.format returns a string.  Why do you format it if you are going to convert it to a long?

If you want to turn the string into a long, then something like
Long.parseLong( aString )
works.

You'll have to take the comma outfor parseLong -- you might want to use the DecimalFormat parse method to convert the string back to a number.
0
 
LVL 15

Expert Comment

by:bpmurray
ID: 20305380
Try this:
 <%
    DecimalFormat df = new DecimalFormat("###,###");
    String MySourceBytes = df.format((MyList.get(i).getSourceBytes())/1024);
 %>
 ...
 I have <%=MySouceBytes%> Bytes!!
0
 

Author Comment

by:wasabi3689
ID: 20305601
MySourceBytes must be long from get function, now I need to convert MySourceBytes long into string value, then df it
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Author Comment

by:wasabi3689
ID: 20305655
or
can I directly format a long value output as "###,###"?
0
 
LVL 15

Accepted Solution

by:
bpmurray earned 200 total points
ID: 20305796
OK, so you need:
      <%
          DecimalFormat df = new DecimalFormat("###,###");
          long mySourceBytes = (MyList.get(i).getSourceBytes())/1024; // Store the value in a long
       %>

       ....
       I have <%=df.format(mySourceBytes);%> bytes!!
0
 
LVL 27

Expert Comment

by:mrcoffee365
ID: 20305833
>>can I directly format a long value output as "###,###"?

No -- long is a long, which is a binary type.  It doesn't have a string display format.  That's why there are classes like DecimalFormat, for formatting binary number types like long, when you want to display the value of a long variable in a String format.


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