단어 바꾸기

package week3;

import java.util.Scanner;

public class Day12_9 {

	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		String text = "Life is too short.";
		System.out.println(text);
		System.out.print("변경하고 싶은 단어를 입력하세요 : ");
		String word = scan.nextLine();
		char[] arr = new char[text.length()];
		for (int i = 0; i < text.length(); i++) {
			arr[i] = text.charAt(i);
		}
		int size = word.length();
		int check = -1;
		int idx = 0;
		for (int i = 0; i < arr.length - size + 1; i++) {
			int count = 0;
			for (int j = 0; j < size; j++) {
				if (arr[i + j] == word.charAt(j)) {
					count += 1;
				}
			}
			if (count == size) {
				idx = i;
				check = 1;
			}
		}
		if (check == 1) {
			int firstIdx = idx;
			int lastIdx = idx + size;
			System.out.print("무엇으로 바꾸시겠습니까?");
			String change = scan.nextLine();
			int length = change.length();
			char[] temp = arr;
			String front = "";
			for (int i = 0; i < firstIdx; i++) {
				front += temp[i];
			}
			System.out.println(front);
			String back = "";
			for (int i = lastIdx; i < temp.length; i++) {
				back += temp[i];
			}
			System.out.println(back);
			String result = front + change + back;
			System.out.println(result);
		} else {
			System.out.println("해당 단어는 존재하지 않습니다.");
		}

	}

}