java - 以相反顺序写入该行

Question

我想以相反的顺序写行，例如输入:第 1 行.第 2 行.第 3 行。输出:第 3 行。第 2 行。第 1 行。

这是下面的代码。

{            
    FileReader fr = new FileReader("src/file/in.txt");
    FileWriter fw = new FileWriter("src/file/out.txt");
    BufferedWriter bw = new BufferedWriter(fw);
    BufferedReader buffer = new BufferedReader(fr);
    String msg =buffer.readLine();
    String[] words = msg.split ("\\.");
    System.out.println( "The reversed words are : ");
    for(int x = words.length - 1; x >=0; x--) {
        bw.write(words[x] + " "); 
    } 
    bw.close();
    fr.close();
}

Answer 1

关闭流

       try {            
            FileReader fr = new FileReader("in.txt");
            FileWriter fw = new FileWriter("out.txt");
            BufferedWriter bw = new BufferedWriter(fw);
            BufferedReader buffer = new BufferedReader(fr);
            String msg =buffer.readLine();
            String[] words = msg.split (" ");
            System.out.println( "The reversed words are : ");
            for(int x = words.length - 1; x >=0; x--) {
                bw.write(words[x] + " ");  // here it is not working
               // System.out.print(words[x]+" " );
            }
            bw.close();
            fw.close();
        } catch (Exception e) {

        }