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Message:

There is always help for a beginner!!!

Posted by Kishori Sharan on September 05, 2000 at 7:01 PM

Hi
1. I suppose you have installed JDK ( Java Development kit ) on your
computer. If you don't have java installed on you system then visit www.java.sun.com and download the free version of latest java1.3 and install it.
2. I suppose c:\jdk1.3 is the home directory in which you have installed your java software. Now you can include c:\jdk1.3\bin in your PATH environment variable ( I assume you are using windows ) in autoexec.bat file. It is not necessary but it will save you typing some extra words everytime you compile and run your java program.

3. NOw you are ready to write a java program which you can compile and run. If you have a java editor then open it. If you need one I will mail it to you. If you don't have java editor then you can open notepad and type the following.

class Hello {
public static void main ( String[] args ) {
System.out.println ( "Hello java!!!" ) ;
}
}

4. Please type exactly as shown in step3. Java is case sensitive. If you type system instead of System ( note uppercase 'S' ) then your program won't compile.
5. Save the notepad file as Hello.java . Now you have to take extra care. Here the file name has to be Hello.java ( note uppercase 'H' ) and if you just type Hello.java when prompted to save a file in notepad then it will save it as Hello.java.txt . So in save file dialog when you say File -> Save in notepad then type the file within double quotes. So instead of typing the file name as Hello.java, please type "Hello.java" and when you type a file name in double quotes then .txt is not appended by notepad. I suppose you saved you Hello.java in c:\myjava directory.

6. Now go to DOS-prompt and change your current directory to your myjava directory. So your dos prompt will look like as foillows.
C:\myjava>

7. Now you can type javac Hello.java on command line as follows
C:\myjava>javac Hello.java
Please note that even file name Hello.java is case sensitive for java. You cannot type hello.java or HEllo.Java. If you havn't included c:\jdk1.3 in PATH variable then please type as follows
c:\myjava>c:\jdk1.3\bin\javac Hello.java

8. After pressing enter in STEP 7 , you will get the command line again like
c:\myjava> if everything went well. At this time you can have your java program compiled and java compiler has created a new file Hello.class . Now you have to run the program
9. On Command line type as follows
C:\myjava>java Hello
Here you don't have to type Hello.java or Hello.class, You have to type just Hello the name of the class which we created in out program. You can also type c:\myjava> c:\jdk1.3\bin\java Hello

10. We use javac to compile a java program using .java file name and java to run a java progran using the class name ( in our case Hello ) .

11. If you need more help. Just post a question or write to kishori_sharan@yahoo.com

Thanx
Kishori

• PATH Sandeep December 26, 2001 at 12:33 AM (0)
• ejb g.pradeep November 28, 2000 at 4:55 PM (0)
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