有关Java无参方法的编程问题，Java编程方法实现。

有关Java无参方法的编程问题，Java编程方法实现。

详细的代码怎么打？

package com.example.demo.csdn;

public class Clock {
    public int hour;
    public int minute;
    public int second;

    public String toTimeString() {
        String h = hour < 10 ? 0 + String.valueOf(hour) : String.valueOf(hour);
        String m = minute < 10 ? 0 + String.valueOf(minute) : String.valueOf(minute);
        String s = second < 10 ? 0 + String.valueOf(second) : String.valueOf(second);
        return String.format("{%s}:{%s}:{%s}", h, m, s);
    }

    public static void main(String[] args) {
        Clock mytime = new Clock();
        mytime.hour = 23;
        mytime.minute = 59;
        mytime.second = 1;
        System.out.println(mytime.toTimeString());
    }


}