[프로그래머스]JAVA 정수 제곱근 판별

링크 : https://programmers.co.kr/learn/courses/30/lessons/12934

코딩테스트 연습 - 정수 제곱근 판별

class Solution {
    public long solution(long n) {
        long answer = 0;
        Double sqrt = new Double(Math.sqrt(n));

        if(checkInt(sqrt)) answer = (sqrt.longValue()+1)*(sqrt.longValue()+1);
        else answer = -1;
        return answer;
    }
    
    public boolean checkInt(Double pDouble){
        boolean result = false;
        if(pDouble.doubleValue() - (double)pDouble.intValue() == 0) 
            return true;
        return result;
    }
}