Question

How to check if specific digit exists in a number with Java

Answer 1

public class MyClass {
    private static boolean check_digit_exists(int n, int digit) {
	    while (n > 0) {
    		if (digit == n % 10) {
    			return true;
    		}
    		n = n / 10;
    	}
	    
	    return false;
    }
    public static void main(String args[]) {
        int num = 230138;

	    System.out.println(check_digit_exists(num, 2));

	    System.out.print(check_digit_exists(num, 5));
    }
}





/*
run:
     
true
false
  
*/

 

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Answer 2

public class MyClass {
    public static void main(String args[]) {
        int num = 230138;
 
        String str = Integer.toString(num); 
        
        String digit_exists = (str.indexOf('2') != -1) ? "yes" : "no";
        System.out.println(digit_exists);
        
        System.out.print((str.indexOf('5') != -1) ? "yes" : "no");
    }
}
 
 
 
 
 
/*
run:
      
yes
no
   
*/

 

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