class ex00 {
    public static void main(String[] args) throws Exception {
        // あとで追加
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        System.out.print("ファイル名を入力してください：");
        String d = br.readLine();
        file f = new file(d);
        System.out.println(f.getAllData());
 
        System.out.println("行数を入力してください");
        int n = Integer.parseInt(br.readLine());
        System.out.println(f.readLine(n));
 
        f.sort();
        System.out.println(f.getAllData());
    }
}
 
class file {
    String file_name;
    String[] lines = new String[10];
 
    file(String _filename) throws Exception {
        FileInputStream fis = new FileInputStream(_filename);
        InputStreamReader isr = new InputStreamReader(fis);
        BufferedReader br = new BufferedReader(isr);
        int i = 0;
        while (br.ready()) {
            lines[i] = br.readLine();
            i++;
        }
    }
 
    public String readLine(int n) {
        return lines[n];
    }
 
    public String getAllData() {
        String result = "";
        for (int i = 0; i < lines.length; i++) {
            result += lines[i] + "\n";
        }
        return (result);
    }
 
    public void sort() {
        Arrays.sort(lines, new Comparator<String>() {
            public int compare(String o1, String o2) {
                return Integer.compare(o1.length(), o2.length());
            }
        });
    }
}
 

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