Introduction

Java is a very powerful and popular programming language. It is pure Object oriented programming language.

Every java program consist of a class.

Environment:

1. Installing JDK
2. Installing any editors where you will write your source code e.g. notepad, notepad++, eclipse, netbeans, intellij...etc
3. Settings System %path% variable
4. Checking java compiller version in command promt
5. javac -version after setting %path% variable

Sample program:

class Hello {
      public static void main(String[] args) {
          System. out.println("Hello World!");
     }
}

• Write the above code in Sample.java file
• Compile the source code using java compiler
  javac Sample.java
• Java compiler compile the source code and generate a bytecode Hello.class (className.class file)
• Execute the bytecode using JVM (Java Virtual Machine)
  java Hello
• Output:
  Hello World!