Read value from text file to JTextField

Hi,
I think this is the right place to post this. Although maybe it is not it could be classed as I/O issues?
I have a JFrame with a JTextField which requires the user to enter a value. When they click a JButton "OK". It writes the value to a text file and closes the frame using FileWriter. If they click clear button it writes the value "" to the file. What I want to do is when the frame opens it reads the value from the text file. I have been trying to use FileReader but have not been able to write the code correctly. Any help would be greatly appreciated.
Thanks

File f = yourfile;
BufferedReader br = new BufferedReader(new FileReader(f));
String value = br.readLine();Alex.

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I am facing problem while reading values from properties file ...i am getting null pointer exception earlier i was using jdeveloper10g now i am using 11g

i am facing problem while reading values from properties file ...i am getting null pointer exception earlier i was using jdeveloper10g now i am using 11g

hi TimoHahn,
i am getting following exception in JDeveloper(11g release 2) Studio Edition Version 11.1.2.4.0 but it works perfectly fine in JDeveloper 10.1.2.1.0
Root cause of ServletException.
java.lang.NullPointerException
at java.util.PropertyResourceBundle.handleGetObject(PropertyResourceBundle.java:136)
at java.util.ResourceBundle.getObject(ResourceBundle.java:368)
at java.util.ResourceBundle.getString(ResourceBundle.java:334)
at org.rbi.cefa.master.actionclass.UserAction.execute(UserAction.java:163)
at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:431)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:236)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
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at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)
at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)
at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:300)
at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
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Read lines from text file to java prog

how can I read lines from input file to java prog ?
I need to read from input text file, line after line
10x !

If you search in THIS forum with e.g. read lines from file, you will find answers like this one:
Hi ! This is the answer for your query. This program prints as the output itself reading line by line.......
import java.io.*;
public class readfromfile
public static void main(String a[])
if you search in THIS forum, with e.g. read lines from text file
try{
BufferedReader br = new BufferedReader(new FileReader(new File("readfromfile.java")));
while(br.readLine() != null)
System.out.println(" line read :"+br.readLine());
}catch(Exception e)
e.printStackTrace();
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Read data from text file one by one using for loop

Dear Forum
I want to read data of single colum of text file inside the for loop one by one(for each iteration value must be replaced by another value of text file).This value is used by a formula inside for loop. also after completion of iterations the values must be plotted on xy graph. How to do it.? please help me.
profravi

It's not very efficient to read a file line by line. Much simpler to read it all at once and then auto-index the results inside a for loop. The image below shows a generic solution to your problem. This assumes that the data in the file is in a single column.
I would also recomend checking ou the learning LabVIEW resources here.
I would aslos suggest that since this type of question is not specific to either NI-Elvis or the LabVIEW SE, you should post similar questions to the LabVIEW board. If you have problems, attaching a sample of the text file would help.
Message Edited by Dennis Knutson on 10-18-2007 09:11 AM
Attachments:
XY Graph From File.PNG ‏4 KB

Read words from text file by delimiter as columns and rows

Hi All,
I need your help as i have a problem with reading string by delimiter. i have used various tech in java, but i can not get the result as expected.
Please help me to get the string from text file and write into excel . i have used a text file.
problem
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OI.ID||'|'||OI.IDSIEBEL||'|'||OI.IDTGU||'|'||OI.WORKTYPE||'|'||OI.UTR_FK
read the below as string by delimiter
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Edited by: user13836688 on Jan 22, 2011 8:13 PM

First of all, when posting code, put it between two tags.
Second of all, the pipe is a special character in regex, so you need to escape it as
.split("\ \|");
Erh. So 2 backslashes before the pipe character. Stupid forum won't post it.
Edited by: Kayaman on Jan 24, 2011 9:35 AM
Edited by: Kayaman on Jan 24, 2011 9:35 AM
Edited by: Kayaman on Jan 24, 2011 9:36 AM

Reading String (Name-Value) from text file into XML

Hi,
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OUTPUT(ty=XXXX,ret=0,rl=
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Regards.
'In Persuit of Happiness' and ..... learning SQL.

And I'm telling you that this is a bad option. You would use the vaccum cleaner to wash the dishes, would you?
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What's wrong with the current C# solution?
Erland Sommarskog, SQL Server MVP, [email protected]
Got it. I was just looking for the available options, nothing wrong with my C# solution. And yes, I don't use vacuum cleaner to wash dishes.
'In Persuit of Happiness' and ..... learning SQL.

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Hi OnlyOne,
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I am trying to read in questions, possible answers and the correct answer from a text file.
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a. something
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b
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I'm not sure if this is what you need but, take a look:
import java.io.*;
public class questions
public static void main(String[] args)
try
Question a=new Question();
ObjectOutputStream out=new ObjectOutputStream(new FileOutputStream(new File("answers.txt")));
out.writeObject(a);
ObjectInputStream in=new ObjectInputStream(new FileInputStream(new File("answers.txt")));
Question b=(Question)in.readObject();
char answer=b.getAnswer();
System.out.println(answer);
catch(IOException e)
System.out.println(e);
catch(ClassNotFoundException e)
System.out.println(e);
class Question implements Serializable
String q;
String a1;
String a2;
String a3;
char c;
public Question()
q=new String("The Question");
a1=new String("1st possible choise");
a2=new String("2st possible choise");
a3=new String("3st possible choise");
c='c';
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q=que;
public void setAnswer1(String an1)
a1=an1;
public void setAnswer2(String an2)
a2=an2;
public void setAnswer3(String an3)
a3=an3;
public void setAnswer(char an)
c=an;
public char getAnswer()
return c;
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If i helped help me too.. (duke $)

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Have you noticed that your file name's extension (".tx t") has a space in it? Though that mismatch would get a -43 Not Found error, not EOF.
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Reading values from properties file

Hi All,
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Hi All,
I am in need of a help from you all.I have a login.jsp which gets username and password as user input and checks in the servlet that if it was admin and admin it will take to index.jsp and if it was other than admin and other users it should take to index1.jsp.For now i am using an if condition to check the values and to dispatch the request.I need to use a properties file for this and need to check by getting the values from the properties file.And also it should check for each entry in properties file and if it finds any matches it should take to the corresponding page.
Please help me in achieving this.
Thanks,
laxmi

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I'm already late 2 weeks for my project and I still can't figure this out :(
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package viewer;
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import java.awt.*;
import java.awt.event.*;
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Hi, Salut
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Hi all,
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Maruti

Hi Maruti,
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Read value from text file to JTextField

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