原谅我啥都不懂就好奇, 发现个好玩的东西

        String shuru="";
        BufferedReader stdin=new BufferedReader(new InputStreamReader(System.in));
        System.out.print("请输入内容：");
        shuru=stdin.readLine();
        System.out.println("你刚才输入的是"+shuru);

直接在输出的控制台上就可以输入内容, 后面用代码再读取出来

还有读取某个位置的文本文档的代码

    public static void readFileByLines(String str) {
        File file = new File(str);
        BufferedReader reader = null;
        try {
            System.out.println("以行为单位读取文件内容，一次读一行");
            reader = new BufferedReader(new FileReader(file));
            String tempString = null;
            int line = 1;
            //一次读一行，读入null时文件结束
            while ((tempString = reader.readLine()) != null) {
                //把当前行号显示出来
                System.out.println("line " + line + ": " + tempString);
                line++;
            }
            reader.close();
        } 
        catch (IOException e) {
            e.printStackTrace();
        } 
        finally {
            if (reader != null) {
                try {
                    reader.close();
                } 
                catch (IOException e1) {
                }
            }
        }
    }