Java Program Structure|Core Java Tutorial for Beginners|G C Reddy|

Sections of Java Programming, Documentation Section -Optional, Package Declaration Statement, Import Statement/s, Class Declaration / Statement, Interface Section (Outside of main method and inside of the class), Main Program, Create Object //Based on the Program requirement, Call Methods //Based on the Program requirement, Normal Statements, Variable Declarations, Print Statements, operation etc, and Code Blocks //Based on the Program requirement. Example: //It is a Sample Program to explain the Program structure and Syntax of Java... package xyza; import java.io.File; public class Sample { //Interface section static int x=100; public int add(int a, int b) { int result =a+b; return result; } public static void main(String[] args) { //Main Program System.out.println(x+y);//300 Sample obj = new Sample(); // Create Object int res= obj.add(100, 300);//Call a Method System.out.println(res); res= obj.multiply(10, 37); System.out.println(res);//370 int a=10; int b=20; double d=10.98; char c='E'; System.out.println("Hell Java"); System.out.println(a+b); if (a b) { System.out.println("A is Big Number"); } else { System.out.println("B is Big Number"); } System.out.println(""); for (int i=1; i =5; i++) { if (i!=4) { System.out.println(i); } } } //Interface section static int y=200; public int multiply(int x, int y) { int result =x*y; return result; } } 1. Documentation Section - Optional 2. Package Declaration - Mandatory 3. Import Statement/s - Depends on your program requirement 4. Class Declaration - Mandatory 5. Interface Section (Outside of the main method (before/after), and Inside of the Class) Declare variables and methods Note: we can write comments in interface section, but writing comments is optional 6. main method (Program execution starts from the main method) Main program - Code with in main method Within main Program 7. Write Comments, but writing comments is optional 8. Declarations (Variables, Constants / Final Variables) 9. Normal Statements (Print Statements, Operations etc,) 10. Create Object 11. Call method/s 12. Write Code Blocks (Conditions/Loops/Constructor etc,)