日期抽象数据类型的两种实现

矫情吗；* 2021-07-24 22:16 365阅读 0赞

**一 日期抽象数据类型API**

<table> 
 <tbody> 
 <tr> 
 <td colspan="2"> public&nbsp;class&nbsp;Date </td> 
 </tr> 
 <tr> 
 <td> Date(int month,int day,int year) </td> 
 <td> 创建一个日期 </td> 
 </tr> 
 <tr> 
 <td> int&nbsp;day() </td> 
 <td> 日 </td> 
 </tr> 
 <tr> 
 <td> int month() </td> 
 <td> 月 </td> 
 </tr> 
 <tr> 
 <td> int year() </td> 
 <td> 年 </td> 
 </tr> 
 <tr> 
 <td> String toString() </td> 
 <td> 对象的字符串表示 </td> 
 </tr> 
 </tbody> 
</table>

**二 测试用例**

package MyDate;
    
    
    /**
    * Copyright (C), 2020-2020, XXX有限公司
    * FileName: Test
    * Author:   cakin
    * Date:     2020/1/11
    * Description: Date日期测试
    */
    public class Test {
        public static void main( String[] args ) {
            int m = Integer.parseInt(args[0]);
            int d = Integer.parseInt(args[1]);
            int y = Integer.parseInt(args[2]);
            BasicDate date1 = new BasicDate(m,d,y);
            SmallDate date2 = new SmallDate(m,d,y);
            System.out.println(date1);
            System.out.println(date2);
        }
    }

**三 BasicDate的实现**

package MyDate;
    
    /**
    * Copyright (C), 2020-2020, XXX有限公司
    * FileName: BasicDate
    * Author:   cakin
    * Date:     2020/1/11
    * Description: Date抽象数据类型的一种实现-BasicDate
    */
    public class BasicDate {
        private final int month;
        private final int day;
        private final int year;
    
        public BasicDate( int month, int day, int year ) {
            this.month = month;
            this.day = day;
            this.year = year;
        }
    
        public int month() {
            return month;
        }
    
        public int day() {
            return day;
        }
    
        public int year() {
            return year;
        }
    
        @Override
        public String toString() {
            return month() +
                    "/" + day() +
                    "/" + year() ;
        }
    }

**四 SmallDate的实现**

package MyDate;
    
    /**
    * Copyright (C), 2020-2020, XXX有限公司
    * FileName: SmallDate
    * Author:   cakin
    * Date:     2020/1/11
    * Description: Date抽象数据类型的一种实现-SmallDate
    */
    public class SmallDate {
        private final int value;
        public SmallDate(int m,int d,int y){
            value = y*512+m*32+d;
        }
        public int month(){
            return (value/32)%16;
        }
        public int day(){
            return value%32;
        }
        public int year(){
            return value/512;
        }
    
        @Override
        public String toString() {
            return month()+"/"+day()+"/"+year();
        }
    }

**五 测试结果**

F:\Algorithm\target\classes>java MyDate.Test 12 31 1999
    12/31/1999
    12/31/1999