Java For Beginners

Java hello world.

1. public class student{
2.     public static void main(String[] args){
3.         System.out.println("Hello World!");
4.     }
5. }

• here public and class is the keyword 
• student is the name of the class
• public keyword is called access modifier but it is optional
• static is the keyword by the help of which we don't have to make the object of the class because its belongs to class.
• main it is the method which is compulsory in java.
• method is the group of statements here line no 3 is the statement.
• line 3 print the Hello World! because it is the print statements.

variable:

• int num = 2147483647;
• long num1 = 2147483647; (here java knows that it is in int range
• long num2 = 2147483648L;(here we have to specify because it is out of range of int so we have to add the L at the last.
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