If-else Ladder in Java

Useful for if-else kind of conditional execution when we have more than two related conditional statements.

Syntax :

if(boolean_expression 1) {
   /* Executes when the boolean expression 1 is true */
}else if( boolean_expression 2) {
   /* Executes when the boolean expression 2 is true */
}else if( boolean_expression 3) {
   /* Executes when the boolean expression 3 is true */
} else  {
   /* executes when the none of the above condition is true. */
}               

Block Diagram :

Example:

import java.util.Scanner;
class Test
{
 public static void main(String []arg)
 {
  Scanner sc;
  sc = new Scanner(System.in);
  int x ;
  System.out.println("MENU\n----------");
  System.out.println("1. for Hello");
  System.out.println("2. for Bye");
  System.out.println("-----------");
  System.out.print("Enter Your Choice: ");
  x = sc.nextInt();
 if(x==1) {
  System.out.print("HELLO USER!!");
 }
 else if(x==2) {
   System.out.print("BYE USER!!");
 }
 else {
   System.out.print("INVALID CHOICE");
  }
 }//main closed
}//class closed

MENU
-----------
1. for Hello
2. for Bye
-----------
Enter Your Choice: 3
INVALID CHOICE

Next topic is nested if statement in Java