How to compile Java???

After "How to install Java???"

                       see that  java compilation

 SAMPLE PROGRAM:

 

class trial
{
    public static void main (String args[])
    {
        System.out.println("My first java Program");
    }   
}


*Open a Notepad.exe and type the program and save as program-name.java on your java drive (In my PC I allocated H: drive for java.It has two folders namely Java and Javafiles where Java folder contains JDK(Java Development kit) and Javafiles contain typed programs saved as .java extension)


Consider this program is saved as tria.java


 From the above we can say 
  
Program-name:tria             (Save as .java)
Class-name:trial                 (class <name>)


Syntax for Compilation(javac):
    
                                               javac<space>program-name.java          (Example: javac tria.java)

After successful compilation of java program,corresponding class file will be automatically created on the current folder.For this program trial.class will be created

Syntax for Run the Program(java):

                                               java<space>class-name                  (Example: java trial)  

Syntax for SET PATH: 
           
                                              set path=%path%;your-java-path 

       (Example:set path=%path%;H:\Java\jdk1.7.0_75\bin)


 Important Commands:

cd<space>folder-name

                     Navigates into the folder.  (cd Javafiles #in my PC,accessing the java programs)

dir
                     Shows the folder name and file name on present place 


Steps:
 Entering the command prompt by pressing (Ctrl + R)---> Run window will appear.
Type "cmd" ---> enter

  
After
 
1.Set path                             (set path=%path%;H:\Java\jdk1.7.0_75\bin)
2.Select drive                       (H:)
3.Select folder                     (cd Javafiles)
4.compile java program      (javac tria.java)
5.run the java program        (java trial)

**in this picture...i created a filename and class-name as trial