Homework_02.java

//노재경

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.HashMap;
import java.util.List;

public class Main {
    public static class FileUtils {
        public String getLoadText(String filePath) {
            StringBuilder sb = new StringBuilder();
            try {
                Path path = Paths.get(filePath);
                Files.lines(path).forEach(line -> sb.append(line).append("\n"));
            } catch (IOException e) {
                e.printStackTrace();
            }
            return sb.toString();
        }
    }

    public static void main(String[] args) {
        FileUtils fileUtil = new FileUtils();
        String filePath = "G:\\내 드라이브\\제로베이스스쿨_백엔드스쿨\\part-01.-java-기초---마종현-강사님\\part-01.-java-기초---마종현-강사님\\Part 01. Java 기초 _소스코드\\Homework\\Homework2\\src\\President.txt";
        String text = fileUtil.getLoadText(filePath);

        if (text.isEmpty()) {
            System.out.println("The file is empty or could not be read.");
            return;
        }

        HashMap<Character, Integer> counts = new HashMap<>();
        for (int i = 0; i < text.length(); i++) {
            char c = Character.toUpperCase(text.charAt(i));
            if (Character.isLetter(c)) {
                counts.compute(c, (key, value) -> (value == null) ? 1 : value + 1);
            }
        }

        int totalLetters = counts.values().stream().mapToInt(Integer::intValue).sum();
        for (char c = 'A'; c <= 'Z'; c++) {
            int number = counts.getOrDefault(c, 0);
            float percent = (float) number / totalLetters * 100;
            String message = "%c= %d개, %.2f%%".formatted(c, number, percent);
            System.out.println(message);
        }
    }
}
Key