时间格式和类中数据获取

Question

自行编写一个时钟类，创建了一个时钟方法，输入hour和min的int形式，如何输出

HH:MM的格式，还有这个类后面的@是存储的内存地址吗？

public class Clock {
    private int hours;
    private int minutes;

    
    public Clock(int h, int m) {
        this.hours=h;
        this.minutes=m;
    }

Clock@4eec7777

Answer 1

字符串拼接一下就可以了

public class Clock {
    private int hours;
    private int minutes;
    public Clock(){}
    public Clock(int h, int m) {
        this.hours = h;
        this.minutes = m;
    }

    @Override
    public String toString() {
        return (hours<10?"0"+hours:hours)+":"+(minutes<10?"0"+hours:hours);
    }

    public static void main(String[] args) {
        Clock clock=new Clock(8,6);
        System.out.println(clock);
    }
}