Java hello world program to print out a simple example

1. Java hello world program:

To start with java programming, compiling and printing out "HelloWorld" string is the first lesson which many java beginners start with.

We create a class which is called HelloWorld class. In this class, we have a main method with static void, which is firstly run by java.

2. Compile:

Go to your directory and run the code javac *.java, it will compile all java files. If there is no error, you then run the code java HelloWorld to run the HelloWorld class. 
The output: Hello world!

 To find out about boolean type in java: