Java program runs differently on Windows and Linux

Question

Hi!
I would like to run a java application (which is written and run on windows platform) on linux platform. I don't know wether it is possible or not, but I tired on the following way:
I have made a small java application. It worked correctly on windows (I developed it on windows). I copied first only the class file (Start.class) to the linux machine (which has exactly the same JDK as windows machine). When I type the command:
java Startit gives me the folloving error:
Exception in thread "main" java.lang.ClassFormatError: Start (unrecognized class file version)
   at java.lang.VMClassLoader.defineClass(libgcj.so.7rh)
   at java.lang.ClassLoader.defineClass(libgcj.so.7rh)
   at java.security.SecureClassLoader.defineClass(libgcj.so.7rh)
   at java.net.URLClassLoader.findClass(libgcj.so.7rh)
   at gnu.gcj.runtime.SystemClassLoader.findClass(libgcj.so.7rh)
   at java.lang.ClassLoader.loadClass(libgcj.so.7rh)
   at java.lang.ClassLoader.loadClass(libgcj.so.7rh)
   at gnu.java.lang.MainThread.run(libgcj.so.7rh)After that I was trying to compile the source file on linux with the command:
javac Start.javabut the compiler gave me an error in the source file.
Is there any way to run the formerly written java application (on windows) on linux machine?
Thanks

Answer 1

When I type the command java-version I get the following:
java version "1.4.2"
gij (GNU libgcj) version 4.1.2 20080704 (Red Hat 4.1.2-46)
Copyright (C) 2006 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.The JDK on linux and windows is the latest (I was download it today).
How can I upgrade the jdk/jre on linux?
Here is the compiler error:
[root@Linux-oracle app]# javac DataMining.java
1. ERROR in DataMining.java (at line 77)
        ArrayList<String> temp = new ArrayList<String>();
        ^^^^^^^^^
The type ArrayList is not generic; it cannot be parameterized with arguments <String>
2. ERROR in DataMining.java (at line 77)
        ArrayList<String> temp = new ArrayList<String>();
                  ^^^^^^
Syntax error, parameterized types are only available if source level is 5.0
3. ERROR in DataMining.java (at line 77)
        ArrayList<String> temp = new ArrayList<String>();
                                     ^^^^^^^^^
The type ArrayList is not generic; it cannot be parameterized with arguments <String>
4. ERROR in DataMining.java (at line 77)
        ArrayList<String> temp = new ArrayList<String>();
                                               ^^^^^^
Syntax error, parameterized types are only available if source level is 5.0
5. WARNING in DataMining.java (at line 240)
        String youtube[][] = new String[20][5];
               ^^^^^^^
The local variable youtube is never read
6. WARNING in DataMining.java (at line 267)
        int e;
            ^
The local variable e is never read
7. ERROR in DataMining.java (at line 329)
        for(int i=1;i<Video+1;i++)
                      ^^^^^^^
The operator + is undefined for the argument type(s) Integer, int
7 problems (5 errors, 2 warnings)