Getting NumberFormat Exception

[sandy mahajan]

Hi,

String str1=request.getParameter("str1");
if(str1==null)
str1="";
using this code iam getting string(No Error).
But i want to convert that string into int & i code
int intstr1= Integer.parseInt(str1);
& i got following exception

java.lang.NumberFormatException: For input string: ""
java.lang.NumberFormatException.forInputString(NumberFormatException.java:48)
java.lang.Integer.parseInt(Integer.java:489)
java.lang.Integer.parseInt(Integer.java:518)
org.apache.jsp.jsp.Play_jsp._jspService(Play_jsp.java:109)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jsp.jsp.DummyController_jsp._jspService(DummyController_jsp.java:84)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

Please show me the right way.....Thanks.

[K.Suresh Kumar]

Hi ,

you try convert null value to integer value.
So that you are getting NumberFormatException.
Your code :

str1="";
int intstr1= Integer.parseInt(str1);

yon can't convert null value to int value.

Regards,
Suresh Kumar.K

[Muhammad Saifuddin]

String str1=request.getParameter("str1");
if(str1==null)
str1="";

doesn't make sense, when you initialized st1 to "" after getting the value through request object.

[sandy mahajan]

Hi,
I generated Random no. & retrives througth this code

String str1=request.getParameter("str1"); // getting String ex."34"
if(str1==null)
str1="";
but i want to convert to int for comparision & code

int intstr1= Integer.parseInt(str1);
but got NumberFormat exception

As per reply to me & i code

String str1=request.getParameter("str1"); // getting String ex."34"
if(str1==null)
str1="0";
int intstr1= Integer.parseInt(str1);
but same error occurs with str1="0" append with String

java.lang.NumberFormatException: For input string: "071 "
java.lang.NumberFormatException.forInputString(NumberFormatException.java:48)
java.lang.Integer.parseInt(Integer.java:477)
java.lang.Integer.parseInt(Integer.java:518)
org.apache.jsp.jsp.Play_jsp._jspService(Play_jsp.java:109)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jsp.jsp.DummyController_jsp._jspService(DummyController_jsp.java:84)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

I stuck at this point.
Please show me the way.........
Thanks

[Herman Schelti]

java.lang.NumberFormatException: For input string: "071 "

There's a space behind the 071

Herman

[Anubhav Anand]

Quick Tip: Please use code tags while posting code it makes a post much more readable and saves time.

You may also like to see how to ask questions on JavaRanch.

[Jhakda Velu]

Hi
You can use trim() method to avoid extra spaces. But ensure that you have done the null check else a null pointer ex will be thrown.

Jhakda