IT/Programming

<디자인 패턴> Factory 패턴

1. Factory Method 패턴은 객체선언은 자바에서 new()를 통해서 생성하는데 Factory패턴은 내부에서 객체를 생성하게 됩니다. 즉, factory를 가져다가 쓰는 부분에서는 new 객체()와 같은 식으로 변수를 선언할 필요가 없습니다. Abstract class나 인터페이스에 대해서 다양한 하위 구현체가 있을 경우에 사용하면 좋습니다. 사용법은 Factory.create(인자는 맘대로) 와 같이 됩니다. 2. 예제 package chap03_StaticFactory; public interface Animal { public void printDescription(); } /////////////////////////////////////////////////////////////////..

2023. 4. 17. 10:33
IT/Programming

[HackerRank] Day 9: Recursion

Objective Today, we're learning and practicing an algorithmic concept called Recursion. Check out the Tutorial tab for learning materials and an instructional video! Recursive Method for Calculating Factorial Task Write a factorial function that takes a positive integer, N as a parameter and prints the result of N! ( N factorial). Note: If you fail to use recursion or fail to name your recursive..

2023. 4. 17. 10:31
IT/Programming

[HackerRank] Day 8: Dictionaries and Maps

Objective Today, we're learning about Key-Value pair mappings using a Map or Dictionary data structure. Check out the Tutorial tab for learning materials and an instructional video! Task Given n names and phone numbers, assemble a phone book that maps friends' names to their respective phone numbers. You will then be given an unknown number of names to query your phone book for. For each name qu..

2023. 4. 17. 10:30
IT/Programming

[HackerRank] Day 7: Arrays

Objective Today, we're learning about the Array data structure. Check out the Tutorial tab for learning materials and an instructional video! Task Given an array, A, of N integers, print A's elements in reverse order as a single line of space-separated numbers. Input Format The first line contains an integer, N (the size of our array). The second line contains N space-separated integers describi..

2023. 4. 17. 10:29
IT/Programming

[HackerRank] Day 6: Let's Review

Objective Today we're expanding our knowledge of Strings and combining it with what we've already learned about loops. Check out the Tutorial tab for learning materials and an instructional video! Task Given a string, S, of length N that is indexed from 0 to N - 1, print its even-indexed and odd-indexed characters as 2 space-separated strings on a single line (see the Sample below for more detai..

2023. 4. 17. 10:28
IT/Programming

[HackerRank] Day 5: Loops

Objective In this challenge, we're going to use loops to help us do some simple math. Check out the Tutorial tab to learn more. Task Given an integer, n, print its first 10 multiples. Each multiple n x i(where 1

2023. 4. 17. 10:27
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