How to open an existing file from java

Hi Guys,
I have one problem Please help me in this.
How to open file(i.e. file can be any type, it is may be image file, doc file or pdf file) using java.
Even i tryed in one way but it is static way that is working in windows not for other OS.
Code :
import java.io.*;
public class CmdExec {
public static void main(String argv[]) {
try {
     DataInputStream din=new DataInputStream(System.in);
     System.out.println("Enter File Path to Open");
     String fName=din.readLine();
     File file=new File(fName);
Runtime.getRuntime().exec("rundll32 SHELL32.DLL,ShellExec_RunDLL " + file.getAbsolutePath());
catch (Exception err) {
err.printStackTrace();
If any other way to do please tell me.
Regards
Siva Prasad

Well, if the OS doesn't provide a mechanism to associate a file name with a certain program, there's nothing you can do.
I don't know whether something like JDIC can help you - otherwise, you'd have to find the solution for each OS. What's inside the exec()'s parenthesisses is not a Java problem anymore.

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