我应该如何将文件加载到我的Java应用程序中？

import java.io.File;
import java.io.FileReader;
import java.io.IOException;

public class LoadFileExample {
    public static void main(String[] args) {
        try {
            File file = new File("example.txt");
            FileReader fileReader = new FileReader(file);
            int data = fileReader.read();
            while (data != -1) {
                System.out.print((char) data);
                data = fileReader.read();
            }
            fileReader.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

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

public class LoadFileExample {
    public static void main(String[] args) {
        try {
            List<String> lines = Files.readAllLines(Paths.get("example.txt"));
            for (String line : lines) {
                System.out.println(line);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;

public class LoadFileExample {
    public static void main(String[] args) {
        try {
            BufferedReader reader = new BufferedReader(new FileReader("example.txt"));
            String line = reader.readLine();
            while (line != null) {
                System.out.println(line);
                line = reader.readLine();
            }
            reader.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}