Question

How to check if length of a string is equal to the number appended at its end in Java

Answer 1

public class CheckIfLengthOfStringEqualToNumberAtItsEnd_Java
{
    public static int extractLastNumber(String str) {
        String[] arr = str.split("\\D+");
  
        return Integer.parseInt(arr[arr.length - 1]);
    }
     
    public static int indexOfAny(String str, char[] anyOf) {
        int lowestIndex = -1;
          
        for (char ch : anyOf) {
            int index = str.indexOf(ch);
            if (index > -1)  {
                if (lowestIndex == -1 || index < lowestIndex) {
                    lowestIndex = index;
                    if (index == 0) {
                        break;
                    }
                }
            }
        }
  
        return lowestIndex;
    }
     
    public static boolean stringLenghtEqualToNumberAtEnd(String str) {
        return indexOfAny(str, new char[] {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9'}) == extractLastNumber(str);
    }
     
    public static void main(String[] args)
    {
        String str = "java programming16";
          
        System.out.print(stringLenghtEqualToNumberAtEnd(str));
    }
}

 
 
/*
run:
  
true
  
*/

 

70+ SQL courses for beginners and professionals