how to run a java file after writing and saving

[yuganthi jayasinghe]

class apple{
public static void main (srting [] args){
system.out.println("Duck");
}
}

[John Jai]

Read http://download.oracle.com/javase/tutorial/getStarted/cupojava/win32.html

[Jelo Nehuptra]

open the command line.

change directory to where the java file is located.

1.type in:

javac apple.java

2. You'll notice, there is a file create with the .class extension, in this case, apple.class

3. then finally, run the class file by typing in:

java apple

4. Notice that there is no extension.

[Aniket S. Kulkarni]

Jelo Nehuptra is right, but make sure that you have installed jdk & you need to configure environment variables if you are using windows.
classpath & path you need to be set to run javac or java command on command prompt. Rest is explained by Jelo Nehuptra.