黑皮書編程練習題10.14

• 題目
• • 程序
• 代碼
• • Test14.java
  • Test14_MyDate.java
  • Test5.java
  • 運行
• UML

題目

補：討論的GregorianCalendar類來簡化編程

程序

Test14.java：測試程序
Test14_MyDate.java：構造程序
Test5：參考程序（編程練習題9.5）

代碼

Test14.java

public class Test14 {public static void main(String[] args) {Test14_MyDate date0 = new Test14_MyDate();Test14_MyDate date1 = new Test14_MyDate(34355555133101L);System.out.println(date0.year + "年" + date0.month + "月" + date0.day + "日");System.out.println(date1.year + "年" + date1.month + "月" + date1.day + "日");} }

Test14_MyDate.java

import java.util.GregorianCalendar;public class Test14_MyDate {int year, month, day; // 月從0開始public Test14_MyDate(){GregorianCalendar gc = new GregorianCalendar();year = gc.get(GregorianCalendar.YEAR);month = gc.get(GregorianCalendar.MONTH);day = gc.get(GregorianCalendar.DAY_OF_MONTH);}public Test14_MyDate(long l){GregorianCalendar gc = new GregorianCalendar();gc.setTimeInMillis(l);year = gc.get(GregorianCalendar.YEAR);month = gc.get(GregorianCalendar.MONTH);day = gc.get(GregorianCalendar.DAY_OF_MONTH);}public Test14_MyDate(int year, int month, int day){this.year = year;this.month = month;this.day = day;}public void setDate(long elapsedTime){GregorianCalendar gc = new GregorianCalendar();gc.setTimeInMillis(elapsedTime + toCalender(year, month, day));year = gc.get(GregorianCalendar.YEAR);month = gc.get(GregorianCalendar.MONTH);day = gc.get(GregorianCalendar.DAY_OF_MONTH);}public long toCalender(int year, int month, int day){day += year * 365;switch (month){case 11: day += 31;case 10: day += 30;case 9: day += 31;case 8: day += 30;case 7: day += 31;case 6: day += 31;case 5: day += 30;case 4: day += 31;case 3: day += 30;case 2: day += 31;case 1: day += 28;}return (long) day * 24 * 60 * 60 * 1000;} }

Test5.java

import java.util.GregorianCalendar;public class Test5 {public static void main(String[] args) {GregorianCalendar gc = new GregorianCalendar();System.out.print(gc.get(GregorianCalendar.YEAR) + "年");System.out.print(gc.get(GregorianCalendar.MONTH) + "月");System.out.println(gc.get(GregorianCalendar.DAY_OF_MONTH) + "日");gc.setTimeInMillis(1234567898765L);System.out.print(gc.get(GregorianCalendar.YEAR) + "年");System.out.print(gc.get(GregorianCalendar.MONTH) + "月");System.out.print(gc.get(GregorianCalendar.DAY_OF_MONTH) + "日");} }

運行

2021年8月21日 3058年8月8日

UML

總結

以上是生活随笔為你收集整理的Java黑皮书课后题第10章：*10.14（MyDate类）设计一个名为MyDate的类的全部內容，希望文章能夠幫你解決所遇到的問題。

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