关注赞赏支持网易云课堂——Java语言程序设计进阶——第二周编程题Clock类的代码：
public class Clock {
Display hour=new Display(24);Display minute=new Display(60);Display second=new Display(60);public Clock(int a, int b, int c){hour.setvalue(a);minute.setvalue(b);second.setvalue(c);}public void tick(){second.increase();if(second.getvalue()==0){minute.increase();if(minute.getvalue()==0){hour.increase();}}}public String toString(){return String.format(“%02d:%02d:%02d\n”,hour.getvalue(),minute.getvalue(),second.getvalue());}Display类部分的代码：public class Display {
