Java 中計算一年中剩餘的天數
若要獲得今年剩餘的天數，請找出當前年份總天數與已過去天數的差值。
首先，計算今年的天數。
Calendar calOne = Calendar.getInstance(); int dayOfYear = calOne.get(Calendar.DAY_OF_YEAR);
現在，計算 2018 年當前年份的總天數。
int year = calOne.get(Calendar.YEAR);
Calendar calTwo = new GregorianCalendar(year, 11, 31);
int day = calTwo.get(Calendar.DAY_OF_YEAR);
System.out.println("Days in current year: "+day);找出天數差，即可獲得今年剩餘的天數。
以下是完整示例。
示例
import java.util.Calendar;
import java.util.GregorianCalendar;
public class Demo {
public static void main(String args[]) {
Calendar calOne = Calendar.getInstance();
int dayOfYear = calOne.get(Calendar.DAY_OF_YEAR);
int year = calOne.get(Calendar.YEAR);
System.out.println("Current Year: "+year);
Calendar calTwo = new GregorianCalendar(year, 11, 31);
int day = calTwo.get(Calendar.DAY_OF_YEAR);
System.out.println("Days in current year: "+day);
int total_days = day - dayOfYear;
System.out.println("Total " + total_days + " days remaining in "+year);
}
}輸出
Current Year: 2018 Days in current year: 365 Total 38 days remaining in 2018
更新於: 2020 年 6 月 29 日
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