HR자바 Prime Checker

개요

HR자바 Prime Checker

• https://www.hackerrank.com/challenges/prime-checker/problem

해커랭크 Java

#	문제	비고
HR자바 Advanced e
53	HR자바 Java Varargs - Simple Addition
54	HR자바 Java Reflection - Attributes
55	HR자바 Can You Access?
56	HR자바 Prime Checker
57	HR자바 Java Factory Pattern
58	HR자바 Java Singleton Pattern
59	HR자바 Java Visitor Pattern
60	HR자바 Java Annotations
61	HR자바 Covariant Return Types
62	HR자바 Java Lambda Expressions
63	HR자바 Java MD5
64	HR자바 Java SHA-256

---

import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;
import java.lang.reflect.*;

import static java.lang.System.in;
class Prime {
    private boolean isPrime(int n) {
        if( n < 2 ) return false;
        if( n < 4 ) return true;
        if( n%2==0 || n%3==0 ) return false;
        for(int i=5; i*i<=n; i+=6 ) if(n%i==0 || n%(i+2)==0) return false;
        return true;
    }
    public void checkPrime(int... nums) {
        for(int num: nums) {
            if( isPrime(num) ) System.out.printf("%d ", num);
        }
        System.out.println();
    }
}

public class Solution {
    public static void main(String[] args) {
        try {
            BufferedReader br=new BufferedReader(new InputStreamReader(in));
            int n1=Integer.parseInt(br.readLine());
            int n2=Integer.parseInt(br.readLine());
            int n3=Integer.parseInt(br.readLine());
            int n4=Integer.parseInt(br.readLine());
            int n5=Integer.parseInt(br.readLine());
            Prime ob=new Prime();
            ob.checkPrime(n1);
            ob.checkPrime(n1,n2);
            ob.checkPrime(n1,n2,n3);
            ob.checkPrime(n1,n2,n3,n4,n5);    
            Method[] methods=Prime.class.getDeclaredMethods();
            Set<String> set=new HashSet<>();
            boolean overload=false;
            for(int i=0;i<methods.length;i++) {
                if(set.contains(methods[i].getName())) {
                    overload=true;
                    break;
                }
                set.add(methods[i].getName());
            }
            if(overload) {
                throw new Exception("Overloading not allowed");
            }
        }
        catch(Exception e) {
            System.out.println(e);
        }
    }
}