[BOJ] 1543 문서 검색 (JAVA)

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class BOJ_1543 {

	public static void main(String[] args) throws IOException {

		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		String str = br.readLine();		// 문서
		String word = br.readLine();	// 찾을 단어
		int lengthBefore = str.length();
		str = str.replace(word, "");
		int lengthAfter = str.length();

		System.out.println((lengthBefore - lengthAfter) / word.length());
		
	}
	
}

 

오!