Java中的 SimpleDateFormat get2DigitYearStart() 方法及示例

SimpleDateFormat 类的get2DigitYearStart()方法用于返回在解析或 set2DigitYearStart() 方法期间设置的 100 年周期的开始。它返回 100 年期间 2 位数年份的开始日期，这些年份被解释为在日期内设置。
句法：

public Date get2DigitYearStart()

参数：该方法不带任何参数。
返回值：该方法返回 100 年期间的开始日期 2 位数年份，这些年份被解释为在日期内设置
下面的程序说明了 SimpleDateFormat 的 get2DigitYearStart() 方法的工作：
示例 1：

Java

// Java code to illustrate
// get2DigitYearStart() 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());
 
            // Use of get2DigitYearStart() method
            // to check start year
            cal.setTime(dt.get2DigitYearStart());
            System.out.println("The start Year: "
                               + cal.get(Calendar.YEAR));
        }
 
        catch (ParseException except) {
            except.printStackTrace();
        }
    }
}

输出：

The Starting Time: Mon Jan 28 00:00:00 UTC 2019
The New Time: Sat May 12 00:00:00 UTC 1917
The start Year: 1900

示例 2：

Java

// Java code to illustrate
// get2DigitYearStart() 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/ 2000"));
            cal.setTime(dt.parse("05/ 12/ 17"));
            System.out.println("The New Time: "
                               + cal.getTime());
 
            // Use of get2DigitYearStart() method
            // to check start year
            cal.setTime(dt.get2DigitYearStart());
            System.out.println("The start Year: "
                               + cal.get(Calendar.YEAR));
        }
 
        catch (ParseException except) {
            except.printStackTrace();
        }
    }
}

输出：

The Starting Time: Mon Jan 28 00:00:00 UTC 2019
The New Time: Fri May 12 00:00:00 UTC 2017
The start Year: 2000