HR자바 Java Lambda Expressions

개요

HR자바 Java Lambda Expressions

• https://www.hackerrank.com/challenges/java-lambda-expressions/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

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Java

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import java.io.*;
import java.util.*;
interface PerformOperation {
    boolean check(int a);
}
class MyMath {
    public static boolean checker(PerformOperation p, int num) {
        return p.check(num);
    }

Java

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   // Write your code here
    public static PerformOperation isOdd() {
        return n -> ( n%2 == 1 );
    }

    public static PerformOperation isPrime() {
        return n -> (new java.math.BigInteger(String.valueOf(n))).isProbablePrime(100);
    }

    public static PerformOperation isPalindrome() {
        return n -> String.valueOf(n).equals(new StringBuilder(String.valueOf(n)).reverse().toString());
    }
}

Java

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public class Solution {
    public static void main(String[] args) throws IOException {
        MyMath ob = new MyMath();
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int T = Integer.parseInt(br.readLine());
        PerformOperation op;
        boolean ret = false;
        String ans = null;
        while (T--> 0) {
            String s = br.readLine().trim();
            StringTokenizer st = new StringTokenizer(s);
            int ch = Integer.parseInt(st.nextToken());
            int num = Integer.parseInt(st.nextToken());
            if (ch == 1) {
                op = ob.isOdd();
                ret = ob.checker(op, num);
                ans = (ret) ? "ODD" : "EVEN";
            } else if (ch == 2) {
                op = ob.isPrime();
                ret = ob.checker(op, num);
                ans = (ret) ? "PRIME" : "COMPOSITE";
            } else if (ch == 3) {
                op = ob.isPalindrome();
                ret = ob.checker(op, num);
                ans = (ret) ? "PALINDROME" : "NOT PALINDROME";
            }
            System.out.println(ans);
        }
    }
}