Java 如何读取文件并执行查找和替换？

我该如何阅读《哈克贝利·费恩全集》的文本文件，并用“a”替换出现的每一个“the”字

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在课堂上想出了这个更简单的方法

import java.io.*;
import java.util.*;
public class Filey {

public static void main(String[] args) throws IOException {
    // TODO Auto-generated method stub
    Scanner s = null;
    String meAlong="";
    PrintWriter writer = null;

    try {
        s=new Scanner(new BufferedReader(new FileReader("HuckFinn.txt")));
        writer = new PrintWriter("output.txt");
        while (s.hasNext())
        {
            meAlong=s.nextLine();
            meAlong=meAlong.replace("the" , "a");
            meAlong=meAlong.replace("The", "A");
            writer.println(meAlong);
        }
    }
    finally 
    {
        if (s !=null)
        {
            s.close();
            writer.close();
        }
    }

}

}

import java.io.*;
import java.util.*;
public class Filey {

public static void main(String[] args) throws IOException {
    // TODO Auto-generated method stub
    Scanner s = null;
    String meAlong="";
    PrintWriter writer = null;

    try {
        s=new Scanner(new BufferedReader(new FileReader("HuckFinn.txt")));
        writer = new PrintWriter("output.txt");
        while (s.hasNext())
        {
            meAlong=s.nextLine();
            meAlong=meAlong.replace("the" , "a");
            meAlong=meAlong.replace("The", "A");
            writer.println(meAlong);
        }
    }
    finally 
    {
        if (s !=null)
        {
            s.close();
            writer.close();
        }
    }

}

}