how to prove if String ends with int?

Question

I have to prove if String ends with int, also cases like "Cat 100" or "Cat 1". Is there a way to write it like "Cat "+(int) or do I have to know, which specific number ends String

Regex works for this. `re.match('Cat \d+$', your_string)` should work — Green Cloak Guy, Jan 05 '21 at 18:54
Does it also need to start with Cat? Are other characters between Cat and number allowed like `Cat Tom 123` or `Cataclysm 123`? — Pshemo, Jan 05 '21 at 18:54

score 2 · Answer 1 · answered Jan 05 '21 at 19:04

You can use the function isDigit(). Check an example.

import java.lang.Character.*;


public class Main
{
    public static boolean lastIsDigit(String s){
        char c = s.charAt(s.length() - 1); 
        return Character.isDigit(c);
    }
    
    public static void main(String[] args) {
        String a = "Hello World!";
        String b = "Hello World1";
        
        System.out.println(lastIsDigit(a));
        System.out.println(lastIsDigit(b));
    }
}

score 0 · Answer 2 · answered Jan 05 '21 at 19:01

You can use splint string for this to separate the word "Cat " from the number and then check if the extension is a number, something like this maybe.

    String str = "Cat 101";
    String[] arrOfStr = str.split(" ");

    try {
        int number = Integer.parseInt(arrOfStr[1]);
    } catch (NumberFormatException nfe) {
        System.out.println("The string does not end with an int");
    }

score 0 · Answer 3 · answered Jan 05 '21 at 19:04

0

You can count characters, assign the value, trim to the one before last. Then make StringToInt and if it is (let's call it x) x = 0 or x > 0 or x < 0 then it was number indeed.

answered Jan 05 '21 at 19:04

Pantelis Pap.

17
8

how to prove if String ends with int?

3 Answers3