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How to write and naming a java program

Java program can be created by using any editor. The source code in java contains one or multiple number of classes. 

Naming a java program

Java program must be saved with a .java extension. The primary name of the program must be same as class name if the class is declared as public. It can be any name if no class is declared as public. In one Java program there is only one public class. 

How to compile a java program

To compile a java program in command prompt (CMD) 
Syntax- javac <file_name.java>
Example- javac Hello.java

How to run a java program

To run a java program in command prompt
Syntax- java class_name
Example- java Hello

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