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  1. import java.util.Scanner;
  2.  
  3. class Ideone {
  4.     private static Scanner input;
  5.  
  6.     public static void print(String message){
  7.         System.out.println(message);
  8.     }
  9.     public static void main(String[] args) {
  10.         input = new Scanner(System.in);
  11.         System.out.println("Enter course code to validate i.e. IT2249: ");
  12.         //assign value to input
  13.         String code = input.nextLine();
  14.  
  15.         // split into first letter and second letter from course code
  16.         boolean fail = false;
  17.         char firstLetter = code.charAt(0);
  18.         char secondLetter = code.charAt(1);
  19.  
  20.         if(code.length() != 6){
  21.         	print("Course code is incorrect, it should have 6 characters. Like - iT1234.");
  22.         	fail = true;
  23.         }
  24.         else if(firstLetter != 'i' && firstLetter != 'I'){
  25.         	//print("First letter should be `i` or `I`.");
  26.         	fail = true;
  27.         }
  28.         else if(secondLetter != 't' && secondLetter != 'T'){
  29.         	//print("Second letter should be `t` or `T`.");
  30.         	fail = true;
  31.         }
  32.         else{
  33.         	String lastFour = code.substring(2);
  34.         	try{
  35.         		int courseCde = Integer.parseInt(lastFour);
  36.         	}
  37.         	catch(NumberFormatException e){
  38.         		fail = true;
  39.         		//print("All last four characters of course should be numbers.");
  40.         	}
  41.         }
  42.         if(!fail)
  43. 	print("Right course code!");
  44.         else if(code.length() == 6){
  45.         	for(int i = 0; i < 6; i++){
  46.         		checkForChar(code.charAt(i), i+1);
  47.         	}
  48.         	print("Wrong input format!");
  49.         }
  50.  
  51.     }
  52.  
  53.     public static void checkForChar(char ch, int pos){
  54.     	if(pos == 1 && ch != 'i' && ch != 'I')print("First letter should `i` or `I` instead of " + ch);
  55.     	else if(pos == 1){print(pos + " is correct choice.");return;}
  56.     	if(pos == 2 && ch != 't' && ch != 'T')print("Second letter should `t` or `T` instead of " + ch);
  57.     	else if(pos == 2){print(pos + " is correct choice.");return;}
  58.     	if(pos > 2){
  59.     		try{
  60.     			int num = Integer.parseInt(""+ch);
  61.     			print(pos + " is correct choice.");
  62.     		}
  63.     		catch(NumberFormatException e){
  64.         			print(pos + " should be digit instead of " + ch);
  65.         		}
  66.     	}
  67.     }
  68. }
Success #stdin #stdout 0.06s 4575232KB
comments (?)
stdin 
itit00
stdout 
Enter course code to validate i.e. IT2249: 
1 is correct choice.
2 is correct choice.
3 should be digit instead of i
4 should be digit instead of t
5 is correct choice.
6 is correct choice.
Wrong input format!
https://ideone.com/ZDmnjp
language:
Java (HotSpot 12)
created:
6 years ago
visibility:
public

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