详解使用Java代码读取并比较本地两个txt文件区别

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
public class FileComparator {
    public static void main(String[] args) {
        String fileAPath = "C:/Users/MAO/Desktop/A.txt";
        String fileBPath = "C:/Users/MAO/Desktop/B.txt";
        List<String> fileALines = readFileLines(fileAPath);
        List<String> fileBLines = readFileLines(fileBPath);
        List<String> uniqueLinesInFileA = new ArrayList<>();
        for (String line : fileALines) {
            if (!fileBLines.contains(line)) {
                uniqueLinesInFileA.add(line);
            }
        }
        List<String> uniqueLinesInFileB = new ArrayList<>();
        for (String line : fileBLines) {
            if (!fileALines.contains(line)) {
                uniqueLinesInFileB.add(line);
            }
        }
        // 文件A中不在文件B中的行
        System.out.println("Lines in file A that are not in file B:");
        for (String line : uniqueLinesInFileA) {
            System.out.println(line);
        }
        // 文件B中不在文件A中的行
        System.out.println("Lines in file B that are not in file A:");
        for (String line : uniqueLinesInFileB) {
            System.out.println(line);
        }
    }
    private static List<String> readFileLines(String filePath) {
        List<String> lines = new ArrayList<>();
        try (BufferedReader reader = new BufferedReader(new FileReader(filePath))) {
            String line;
            while ((line = reader.readLine()) != null) {
                lines.add(line);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return lines;
    }
}

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.List;
import java.util.stream.Collectors;
public class FileComparator {
    public static void main(String[] args) throws IOException {
        String fileAPath = "C:/Users/MAO/Desktop/A.txt";
        String fileBPath = "C:/Users/MAO/Desktop/B.txt";
        List<String> fileALines = Files.lines(Paths.get(fileAPath))
                .collect(Collectors.toList());
        List<String> fileBLines = Files.lines(Paths.get(fileBPath))
                .collect(Collectors.toList());
        // 文件A中不在文件B中的行
        List<String> uniqueLinesInFileA = fileALines.stream()
                .filter(line -> !fileBLines.contains(line))
                .collect(Collectors.toList());
        // 文件B中不在文件A中的行
        List<String> uniqueLinesInFileB = fileBLines.stream()
                .filter(line -> !fileALines.contains(line))
                .collect(Collectors.toList());
        System.out.println("Lines in file A that are not in file B:");
        uniqueLinesInFileA.forEach(System.out::println);
        System.out.println("Lines in file B that are not in file A:");
        uniqueLinesInFileB.forEach(System.out::println);
    }
}