Converting a string to an integer - NumberFormatException

Hello,
I have 2 string arrays, one that olds names and one that holds id numbers. They are both stored in a file as Strings. I then read this file into my program and put split the strings up into an array.
I then try to convert the id to integer inside my program like so:
public void make_array(String[] car_info) {
                // put in arraylist and change variable type to correct ones
                final int ID_INDEX = 0;
                final int TYPE = 1;
                int cust_id = 22;
                String type;
                //convert to correct variable types
                try {
                        //convert to string
                        cust_id = Integer.parseInt(car_info[ID_INDEX]);
                } catch (NumberFormatException e) { System.out.println(e); }
                type = car_info[TYPE];
}I then get the errors when i try this:
java.lang.NumberFormatException: For input string: "1"
So the id was stored as "1", but i want to convert it to an integer value. Any ideas on why this happends? Also before i try to convert i output the id from the array and it is correct, after the conversion it is 0, obviously it is not working. But i'm not sure what is wrong.
Any ideas?

only works when the string is a single number suchas
"1" or "4". If you try to use it with the input
string as a longer one like "123" or "12" itcreates
a NumberFormatExceptionYou must be mistaken. The value must not be what you
think it is. Do some debugging:
String strVal = car_info[ID_INDEX].trim();
System.out.println("This is the number to be
parsed -->" + strVal + "<--");
customer_id = Integer.parseInt(strVal);That is a good idea, but it seems as though the string is fine: I did:
gary@linuxbox# cat cars
this output:
1,5,Renault Clio,Small Car,25,4,false
As you can see the number 25 is a two figure number, and it looks good. I also output the number in the java program like this:
System.out.println("the number is ------>" + twodigitnumber + "<------");This output the number: ------->25<---------- So there doesn't seem to be any wierd spacing or characters there.

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Converting a String to an integer?

i need to convert a string to an integer..i searched through the site but i didn't find anything...
Is this conversion possible?

You didn't look very hard - it's right in the javadocs:
String s = "44";
int x = Integer.parseInt(s);I'll leave the exception handling for you.

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How can I convert a string to an integer?

sorry, not "of new Integer.." but "or new Integer(.."
Message was edited by:
s-e-r-g-e

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This is kind of a newbie question, but:
If I have a string which looks like this: "12,54,253,64"
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Thanks, I'll do that. I was looking at StringTokenizer and other things, but it seems they are not implemented in j2me?

Coverting from a string to an integer

Hi:
Is it possible to covert a string to an integer?
For example I want to convert the following string values to integers so that I can develop a method to use java.util.Date to test for overlapping appointments.
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@version 1.0
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Hello,
First I would like to suggest, DONT use the class names that have already being defined in JAVA, Here you have used, CALENDAR class, this approach should be avoided, If this class is in the same project where you also want to use the JAVA CALENDAR class, then you mite not be able to do so.
As for the conversion, A simple way is that:
You already know that the time cannot go more than 2 digits (Specifically not more than 24 hours in case of hours and 60 in case of minutes) and the (am) (pm) takes 2 more places, so what you can do is validate if the string size is 4 or 3, if 4 then take the first 2 substrings i.e. somestring.substring(0,2) and then use the Ineteger.parseInt(some string) method.
similarly if the String size is 3 then take the first substring
e.g. somestring.substring(0,1)
This is how you can convert the string to the Integer and compare it, You can store it as an Integer Object and store it in the Vector If you want to.
Hope this helps
Regards
Rohan

How to convert string to an integer in SQL Server 2008

Hi All,
How to convert string to an integer in sql server,
Input : string str="1,2,3,5"
Output would be : 1,2,3,5
Thanks in advance.
Regards,
Sunil

No, you cannot convert to INT and get 1,2,3 BUT you can get
1
2
3
Is it ok?
CREATE FUNCTION [dbo].[SplitString]
@str VARCHAR(MAX)
RETURNS @ret TABLE (token VARCHAR(MAX))
AS
BEGIN
DECLARE @x XML
SET @x = '<t>' + REPLACE(@str, ',', '</t><t>') + '</t>'
INSERT INTO @ret
SELECT x.i.value('.', 'VARCHAR(MAX)') AS token
FROM @x.nodes('//t') x(i)
RETURN
END
----Usage
SELECT * FROM SplitString ('1,2,3')
Best Regards,Uri Dimant SQL Server MVP,
http://sqlblog.com/blogs/uri_dimant/
MS SQL optimization: MS SQL Development and Optimization
MS SQL Consulting:
Large scale of database and data cleansing
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Hi,
I have a question.
How do I convert from String to Integer?
Here is my code:
try{
String s="000111010101001101101010";
int q=Integer.parseInt(s);
answerStr = String.valueOf(q);
catch (NumberFormatException e)
answerStr="Error";
but, everytime when i run the code, i always get the ERROR.
is the value that i got, cannot be converted to int?
i've done the same thing in c, and its working fine.
thanks..

6kyAngel wrote:
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How do I know if I can convert a String value to an int value or not?

Hi,
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Encephalopathic wrote
Again, why?One of the problems (have been dued) in my codelab asks us to write a class as follow
Write a class definition of a class named 'Value' with the following:
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a constructor with no parameters
a method 'setVal' that accepts a single parameter,
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Hi,
you can use a Double for example - assuming value is that string to parse
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greetings Marsian
P.S.: the Double class is usefull for that, because you also can get intValue(), doubleValue() or longValue() out of it for example. The StreamTokenizer for example parses numbers also only to double.

String date to integer

Need help.
Does anybody know how to convert a string date to int..
format of the date is like this(dd-mm-yyyy) example ->15-Aug-1993.
I would like to convert the corresponding month to int...
like for Jan=1, Feb=2,Mar=3...Aug=8...Dec=12...
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If your intention is to convert "15-Aug-1993" into "15-8-1993", ie a string->string conversion, use a SimpleDateFormat to parse the first string into a Date. And then use another one to format the date into the appropriate format.
If you want to obtain an integer value from the string according to the scheme you presented, you could parse it as above then use the getMonth() mehod of the Date class. Note: the returned value is zero based (January is zero, not one) and the method is deprecated.
It's better to use the Calendar class:
* Use SimpleDateFormat to obtain a Date (ie parse the string)
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* use the get() method of Calendar to obtain the month
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Date Formatting, Converting from String to Timestamp

I am trying to convert a string date to timestamp.
I have tried a couple of different ways to arrive at the end result.
I am basically trying to convert a date in the "dd-MM-yyyy" format to a timestamp.
If I use the following code, I get a date like this "18-May-2004 12:00:00 AM".
SimpleDateFormat sdf = new SimpleDateFormat("dd-MM-yyyy);
Date dContractDate = sdf.parse("18-05-2004");
long dateInMilli = dContractDate.getTime();
bHelp.bcontractdate = new Timestamp(dateInMilli);
How can I make this code display the current time not midnight or some defaulted value?
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I think a clever person would reuse their Date.classObject and call Date.setTime() as opposed to always
rolling out a new Date()
Not really a question of cleverness. Your code wins
nothing. Objects are not magically created and garbage collected in the ether.
The cost of creating a Date is nothing
compared to the cost of a format() call. True, but not valid a valid statement pertaining to the issue which is
"does always rolling dates suffer a performance hit?"
Plus you lost clarity Maybe you loose track of your code if you don't make new Objects all the time,
but I have never suffered from this.
Why do you think Sun provided the setDate() method?
and thread-safety.I have only had Thread issues when I didn't program them properly.
Luckilly I always program the correctly ;) (Touch wood)
The facts as I seem are thus:
Rolling new dates on a 1.83 GHZ PC incurrs on average
a 19% penalty. Here is the proof.
Save this program and save it as DateTest.java
If you don't want to waste the time here are the results of running it
through the default 10 iterations.
Running 10 iterations.
Reuse of dates is 27% more efficient
Reuse of dates is 17% more efficient
Reuse of dates is 18% more efficient
Reuse of dates is 20% more efficient
Reuse of dates is 20% more efficient
Reuse of dates is 17% more efficient
Reuse of dates is 17% more efficient
Reuse of dates is 20% more efficient
Reuse of dates is 20% more efficient
Reuse of dates is 18% more efficient
Gaining "nothing " actually = 19% on average
Low percent diff = 17 High percent diff = 27
Run it 100 times and it should still be around 19%
With the hi time being about 47% (Probably the result of garbage collecting)
//////////////////////////////////// <PROOF> ///////////////////////////////////////
import java.util.Date;
public class DateTest
DateTest()
public int run()
int percent = 0;
int loopCount = 0;
Date date = null;
int z=0;
long start1=0,end1=0,start2=0,end2=0,now=0;
int time1 = 0,time2 = 0;
   now = System.currentTimeMillis();
   date = new Date(now);
   loopCount = 10000000;
   start1    = System.currentTimeMillis();
   for(z=0;z<loopCount;z++)
      now = System.currentTimeMillis();
      date.setTime(now);
   end1 = System.currentTimeMillis();
   start2    = System.currentTimeMillis();
   for(z=0;z<loopCount;z++)
      now   = System.currentTimeMillis();
      date = new Date(now); // use 'now' so test loops are =.
   end2 = System.currentTimeMillis();
   time1 = (int)(end1 - start1);
   time2 = (int)(end2 - start2);
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   return percent;
public static void main(String args[])
int z=0;
int lowP=100,hiP = 0; // lowpercent/highpercent
DateTest d = new DateTest();
int loopCount = 0;
long totals   = 0;
int average   = 0;
int values[];
int retVal = 0;
   try // Yea olde Lazy person's command line handler :)
      loopCount = Integer.parseInt(args[0]);
   catch(Exception any)
      loopCount = 10;
   if(loopCount == 0)
      loopCount = 10;
   values = new int[loopCount];
   System.out.println("Running "+loopCount+" iterations.");
   for(z=0;z<loopCount;z++) //
      retVal = d.run();
      if(lowP > retVal)
         lowP = retVal;
      if(hiP < retVal)
         hiP = retVal;
      values[z] = retVal;
   for(z=0;z<loopCount;z++)
      totals += (long)values[z];
   average = (int)(totals/loopCount);
   System.out.println(" Gaining \"nothing \" actually = "+average+"% on average");
   System.out.println("Low percent diff = "+lowP+" High percent diff = "+hiP);
}////////////////////////////////// </PROOF> /////////////////////////////////////////
Your "nothing" is in fact on average about a 19% performance hit. per call.
These inefficiencies build up and java is infested with the,
Was it not so the java would run much more efficiently than it now does.
Ask yourself; why did Sun supply the setDate() method???
(T)

How do you turn a string into an integer?

how do you turn a string into an integer?
for ex, if i wanted to turn the string "5" into the integer 5, how would i do that?

String stringNumber="5";
try{
int number=Integer.parseInt(stringNumber);
}catch(NumberFormatException e){
System.out.println("The string "+stringNumber+" must be a number!");
}

Can't convert int to java.lang.Integer.

Hi everyone.
I'm working on an auction site at the moment and have problems gaining a bidID number. This is part of my code and my error.
AuctionFacade aHse = (AuctionFacade) application.getAttribute("AuctionFacade");
String strTraderName = (String)session.getAttribute("traderName");
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^
Can't convert int to java.lang.Integer.
can anyone help please?

So, does "aHse.getBidPrice" expect an int or an Integer as its parameter? And does it return an int, or an Integer, or what? The answer to those questions may lead to your solution -- look at what you are actually using as the parameter, for example.

Converting a String to an Object

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Would a simple cast do ?
David

dattard,
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