How to generate bar chart using java by reading the input from file.?

[orlando.boomi]

Hi, I need to generate bar chart using java by reading the input file. I am using fedora 14.

for example,

input.txt
xaxis y axis
12 17
26 30
40 40.

Using that input.txt file I need to generate chart. Please help me.

Thanks in advance.....

[DarrylBurke]

Please help me.

Sure. What have you tried, and where are you stuck?

Recommended reading: How to ask questions the smart way

db

[Fubarable]

I second Darryl's question. Please understand that no one's going to do this for you, and since your question is so general and vague and doesn't tell us what you've tried or where specifically you're stuck, about all we can do is suggest that you read the Java tutorials. So for more "helpful" help, please provide the details of your problem. Darryl's link will outline just what information we need in order to be able to help you.

[orlando.boomi]

Hi Fubarable,
Thanks, I used JfreeChart for my requirement. But I don't know how to use that JfreeChart. Currently I am using Jexcel package for writing java code. I need to write the data into the excel cells from the input file. First I am trying this code.

jxlmacro.java

import java.io.File;
import java.util.*;
import jxl.*;
import jxl.write.*;

public class jxlmacro
{
WritableWorkbook workbook = Workbook.createWorkbook(new File("output.xls"));
public static void main(String args[])
{
WritableSheet sheet = Workbook.createSheet("First Sheet",0);
Label label = new Label(0,2,"A label record");
sheet.addCell(label);
jxl.write.Number number = new jxl.write.Number(3,4,3.1459);
sheet.addCell(number);
jxl.Workbook.write();
jxl.Workbook.close();
}
}

If i compile this code, I am getting the below errors.

ERROR:
jxlmacro.java:12: cannot find symbol
symbol : method createSheet(java.lang.String,int)
location: class jxl.Workbook
WritableSheet sheet = Workbook.createSheet("First Sheett",0);
^
jxlmacro.java:17: cannot find symbol
symbol : method Write()
location: class jxl.Workbook
jxl.Workbook.Write();
^
jxlmacro.java:18: non-static method close() cannot be referenced from a static context
jxl.Workbook.close();
^
Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: Some input files use unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.

Please give me a solution.

[Fubarable]

I don't use JFreeChart and so can't give you specific help, but the error messages can be quite helpful; so let's look at them. For instance this one:

jxlmacro.java:12: cannot find symbol
symbol  : method createSheet(java.lang.String,int)
location: class jxl.Workbook
                WritableSheet sheet = Workbook.createSheet("First Sheett",0);
                                              ^

is telling you that the class jxl.Workbook doesn't have a static method createSheet that takes a String and an int as parameters.


And this error:

jxlmacro.java:17: cannot find symbol
symbol  : method Write()
location: class jxl.Workbook
                jxl.Workbook.Write();
                            ^

Is telling you that the jxl.Workbook class does not have a parameterless static Write method.


This one is telling you that the jxl.Workbook method close() is not static and cannot be called on the Workbook class:

jxlmacro.java:18: non-static method close() cannot be referenced from a static context
                jxl.Workbook.close();
                            ^

Probably it can be called on a Workbook instance.


Your best bet is to read over the JFreeChart API and other documentation to see just what classes and methods are available and only use those methods. Be careful not to try to use classes in a static way when you should in fact be creating instances of the classes and calling method on these instances. Be careful of your spelling and capitalization. For example, you're trying to call a method "W"rite, when I know that JFreeChart's code follows Java naming conventions and that all of its method names begin with a lower case letter.

Luck!