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• All codes are case sensitive.
• Blank line and Indentation
  • Blank lines, spaces, and tabs are white-space characters
    • Ignored by compiler
  • You can use any number of spaces and line breaks to separate words.
    But, you should make program more readable.
• Block comment:
  • Start with /*, and end by */.
  • It can be two or more lines.
  • It provides program reader with information.
    • It shows who wrote the program.
    • It also shows the purpose of the program.
  • The compiler will not read the block.
• Line comment:
  • Start with //, end at the end of line.
  • Tell the compiler to ignore the rest of that particular line.
  • It is a place, the programmer can write a remark to remind himself or reader.
• Each statement end with ;
• Beginning and ending braces:{} to block the class, method, loop.
• public class ClassName{}
  Classes are the fundamental building blocks of Java programs.
  The keyword public denotes that the class is usable by the "public".
  Every Java program consists of at least one class that the programmer define.
  That is, there is at least one programmer-defined class.
  The file name should be same as the name of the class that includes the main method.
• main method:
  public static void main ( String[] args )
  The keyword static indicates that the main method does not operate on an object.
  OS starts the program from main method.
• System.out.println("Welcome to Java Programming!" );
  uses the System class from the core library to print the "Welcome to Java Programming!" message to standard output.