读取文本文件的不同方法？

import java.io.*;

public class ReadTextFileExample {
    public static void main(String[] args) {
        try {
            File file = new File("path/to/file.txt");
            FileInputStream fis = new FileInputStream(file);
            int content;
            while ((content = fis.read()) != -1) {
                System.out.print((char) content);
            }
            fis.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

import java.io.*;

public class ReadTextFileExample {
    public static void main(String[] args) {
        try {
            File file = new File("path/to/file.txt");
            FileReader fr = new FileReader(file);
            BufferedReader br = new BufferedReader(fr);
            String line;
            while ((line = br.readLine()) != null) {
                System.out.println(line);
            }
            br.close();
            fr.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

import java.io.*;
import java.nio.charset.StandardCharsets;
import java.nio.file.*;

public class ReadTextFileExample {
    public static void main(String[] args) {
        try {
            Path path = Paths.get("path/to/file.txt");
            BufferedReader br = Files.newBufferedReader(path, StandardCharsets.UTF_8);
            String line;
            while ((line = br.readLine()) != null) {
                System.out.println(line);
            }
            br.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}