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Compiling and executing a java program

Java source code is always stored in a file with a .java file extension. Once you have created your source code, you simply save it with a .java extension and it is ready to be compiled. To compile your java code, you use the following command:

javac your_filename.java

Note that javac is all small caps. javac is the name of the java compiler. It takes your class and convert it into a file with a .class file (usually called "class files"). This file will have the same name as your java file, except it will have the .class file extension instead of .java. This will be the file that the java interpreter is going to execute.

Executing java code

Once your source code files (.java files) are compiled, you can now execute these files for as many times as you like. Remember, if your file has errors, it will not be compiled until all errors are fixed. To execute a java class, you use the following command:

 java your_class_name

Note here, that you do not need to specify the .class file extension, java will know and look for the a .class file with the specified name.

For example, let us take a look at the code bellow:



public class HelloWorld {



   public static void main(String[] args){

    

      System.out.println("Hello there!!!");

   }





}

Save the file as HelloWorld.java. Now, to compile this file, we will issue the following command:

javac HelloWorld.java

This will compile the code and produce a file names HelloWorld.class

To execute that file we issue the following command:

java HelloWorld

This will print Hello there!!! on the computer screen.

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Compiling and executing a java program

Executing java code

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