Java SimpleDateFormat set2DigitYearStart()方法及实例

SimpleDateFormat类 的 set2DigitYearStart() 方法用于设置100年的2位数年份，并解释为在用户特定的日期上开始。该方法解析日期并在starting_Date到 (starting_Date+100)年的范围内设置日期。
语法：

public void set2DigitYearStart(Date _starting_Date_ )

参数： 该方法需要一个日期类型的参数 starting_date ，指的是方法中的起始日期，范围可以达到（starting_date + 100）年。
返回值： 该方法返回一个无效类型。
以下程序说明了SimpleDateFormat的set2DigitYearStart()方法的工作：
示例1：

// Java code to illustrate set2DigitYearStart() method import java.text.*;import java.util.Calendar; public class SimpleDateFormat_Demo {    public static void main(String[] args)        throws InterruptedException    {         SimpleDateFormat dt            = new SimpleDateFormat("MM/ dd/ yy");         try {            Calendar cal = Calendar.getInstance();            cal.setTime(dt.parse("10/ 27/ 16"));            System.out.println("The Starting Time: "                               + cal.getTime());             // Setting 1916 instead of 2016            // Using set2DigitYearStart() method            dt.set2DigitYearStart(                dt.parse("01/ 01/ 1900"));            cal.setTime(dt.parse("06/ 12/ 16"));            System.out.println("The New Time: "                               + cal.getTime());        }         catch (ParseException except) {            except.printStackTrace();        }    }}

输出

The Starting Time: Thu Oct 27 00:00:00 UTC 2016The New Time: Mon Jun 12 00:00:00 UTC 1916

例2：

// Java code to illustrate set2DigitYearStart() method import java.text.*;import java.util.Calendar; public class SimpleDateFormat_Demo {    public static void main(String[] args)        throws InterruptedException    {         SimpleDateFormat dt            = new SimpleDateFormat("MM/ dd/ yy");         try {            Calendar cal = Calendar.getInstance();            cal.setTime(dt.parse("01/ 28/ 19"));            System.out.println("The Starting Time: "                               + cal.getTime());             // Setting 1916 instead of 2016            // Using set2DigitYearStart() method            dt.set2DigitYearStart(                dt.parse("01/ 01/ 1900"));            cal.setTime(dt.parse("05/ 12/ 17"));            System.out.println("The New Time: "                               + cal.getTime());        }         catch (ParseException except) {            except.printStackTrace();        }    }}

输出

The Starting Time: Mon Jan 28 00:00:00 UTC 2019The New Time: Sat May 12 00:00:00 UTC 1917