请问这几个应该怎么写,请大家帮我看一下,谢谢

Question

public class Clock
{
            private int hour, min, sec;
            
            // constructors
            public Clock(int hh, int mm, int ss)
            {
                hour = hh;
                min = mm;
                sec = ss;
            }
             
            public Clock(Clock other)
            {
                hour = other.hour;
                min = other.min;
                sec = other.sec;
                
            }
            
             
            public Clock()
            {
                hour = 0;
                min = 0;
                sec = 0;
            }
            
            public Clock(long seconds)
            {
                hour = (int) seconds / 3600;
                min = (int) seconds %3600 /60;
                sec = (int) seconds % 60;
            }
            // transformers
            
            public void copy(Clock other)
            {
                hour = other.hour;
                min = other.min;
                sec = other.sec;
                
            }
            public void add(Clock other) //这里无法complie..要求加other到target
            { int totalsec;
                totalsec = other.hour*3600 + other.min*60 + other.sec + hour*3600 + min*60 + sec;
                hour = (int) seconds / 3600;
                min = (int) seconds %3600 /60;
                sec = (int) seconds % 60;
            }
            
            public void subtract(Clock other) //这里无法complie..要求减other到target
            {
                int totalsec;
                totalsec = hour*3600 + min*60 + sec - (other.hour*3600 + other.min*60 + other.sec);
                hour = (int) seconds / 3600;
                min = (int) seconds %3600 /60;
                sec = (int) seconds % 60;
            }
            public void addSeconds(int ss)//这里无法complie..要求加ss seconds到target
            {
                int totalsec;
                totalsec = hour*3600 + min*60 + sec +ss;
                hour = (int) seconds / 3600;
                min = (int) seconds %3600 /60;
                sec = (int) seconds % 60;
            }
                
            //accessors
            public boolean isLater(Clock other)
            {
               if (hour > other.hour)
               return true;
               else if (min > other.min)
               return true;
               else if (sec > other.sec)
               return true;
               else return false;
            }
            
            public boolean equals(Clock other)
            {
             
                 return hour == other.hour && min == other.min 
                        && sec == other.sec;
                 
              
            }
            
            public long asSeconds()
            {
                return hour * 3600 + min * 60 + sec;
                
            }
            
            public String toString()
            {
                return "hour:"+ hour + "min:" + min + "sec" + sec;
                
            }
 }

Answer 1

public class Checkout
{
           private static int count;
           
           public static int getCount()
           {
               return count;
            }        private int serviceTime;         
                private int indexNumber;   
                private int custCount;

                private Customer[]//这里要写一个array of customer
           
           
           //constructors
           public Checkout(int servicetime)
       {
        serviceTime = new Clock();
       }        //accessors
            public String toString()
            {
                 return " ";
            }
            
            public int getServiceTime()
            {
                return new Clock();
                  
            }
            
            public int getCustCount()
            {
                return count;
            }
            
            public int getNumber()
            {
                return 0;
            }
            
            //tranformers
           
        public void add(Customer cust)//要添加cust到array,增加custCount
            {
                
            }
   
   
}

Answer 2

另外请问如何写一个controller去测试这个customer.java?
public class Customer
{
           private static int count;
           
           public static int getCount()
           {
               return count;
            }
           
           private Clock joinedTime, completionTime, serviceTime;         
           private int items;   
           private int payMethod;
           
           
           public static final int CHEQUE = 1;
           public static final int CASH = 2;
           public static final int CARD = 3;
            
            //constructors
           public Customer()
           {
               joinedTime = new Clock();
               completionTime =  new Clock();
               serviceTime = new Clock();         
               items   =   0;   
               payMethod =  CASH;
               count ++;
            }
            
           public Customer(Clock start, int payBy, int size)
           {
               this();
               joinedTime = start;
               items   =   size;   
               payMethod = payBy;
            }
            
            //transformers
            public void setCompletionTime(Clock time)
            {
                completionTime = new Clock();
            }
            
            public void setServiceTime(Clock time)
            {
                serviceTime = new Clock();
            }
            
            public void setPayMethod(int method)
            {
                payMethod = 0;
            }
            
            public void setItemSize(int size)
            {
                size = 0;
            }
            
            //accessors
            public String toString()
            {
                 return " ";
            }
            
            public String payMethodAsString()
            {
                switch (payMethod)
                {
               case 1 :  return "CHEQUE";
    
               case 2 :  return "CASH";

                       case 3 :  return  "CARD";
      

                  default : return " ";
             }  // end of switch
                  
            }
            
            public Clock getJoinedTime()
            {
                return new Clock();
            }
            
            public Clock getCompletionTime()
            {
                return new Clock();
            }
            
            public Clock getServiceTime()
            {
                 return new Clock();
            }
            
            public int getPayMethod()
            {
                return 0;
            }
            
            public int getItems()
            {
                return 0;
            }}