Question

Write a program that contains a static method isValid that takes in a String. If the String contains a single @ sign, return true. If the String contains no @ signs or more than 1 @ sign, return false.

Answer 1

public class Validity {

  

public static boolean isValid(String str) {

int count = 0;

for(int i=0 ; i<str.length(); ++i) {

if(str.charAt(i) == '@')

++count;

}

return count==1;

}

public static void main(String[] args) {

System.out.println(isValid("Hello@"));

System.out.println(isValid("Hello@@"));

System.out.println(isValid("Hello"));

}

}

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SEE OUTPUT


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