Java 日历 setTime()方法及实例

Calendar类中的 setTime(Date dt ) 方法用于设置Calendars的时间，该Calendars的时间值由给定或传递的日期作为参数来表示。

语法

public final void setTime(Date dt))

参数： 该方法需要一个日期类型的参数 dt ，指的是要设置的给定日期。

返回值： 该方法不返回任何值。

下面的程序说明了日历类的setTime()方法的工作原理：

例1 :

// Java code to illustrate
// setTime() method
  
import java.util.*;
public class Calendar_Demo
    extends GregorianCalendar {
    public static void main(String[] args)
    {
        // Creating calendar objects
        Calendar calndr1
            = (Calendar)Calendar.getInstance();
        Calendar calndr2
            = (Calendar)Calendar.getInstance();
  
        // Displaying the current date
        System.out.println("The Current"
                           + " System Date: "
                           + calndr1.getTime());
  
        // Setting to a different date
        calndr1.set(Calendar.MONTH, 5);
        calndr1.set(Calendar.YEAR, 2006);
        calndr1.set(Calendar.DAY_OF_WEEK, 15);
        Date dt = calndr1.getTime();
  
        // Setting the timevalue
        calndr2.setTime(dt);
  
        // Displaying the new date
        System.out.println("The modified"
                           + " Date:"
                           + calndr2.getTime());
    }
}

输出:

The Current System Date: Fri Feb 22 07:33:13 UTC 2019
The modified Date:Sun Jun 18 07:33:13 UTC 2006

例2 :

// Java code to illustrate
// setTime() method
  
import java.util.*;
  
public class Calendar_Demo
    extends GregorianCalendar {
  
    public static void main(String[] args)
    {
        // Creating calendar objects
        Calendar calndr1
            = (Calendar)Calendar.getInstance();
        Calendar calndr2
            = (Calendar)Calendar.getInstance();
  
        // Displaying the current date
        System.out.println("The Current"
                           + " System Date: "
                           + calndr1.getTime());
  
        // Setting to a different date
        calndr1.set(Calendar.MONTH, 10);
        calndr1.set(Calendar.YEAR, 1995);
        calndr1.set(Calendar.DAY_OF_WEEK, 20);
        Date dt = calndr1.getTime();
  
        // Setting the timevalue
        calndr2.setTime(dt);
  
        // Displaying the new date
        System.out.println("The modified"
                           + " Date: "
                           + calndr2.getTime());
    }
}

输出:

The Current System Date: Fri Feb 22 07:33:20 UTC 2019
The modified Date: Fri Nov 24 07:33:20 UTC 1995

参考资料： https://docs.oracle.com/javase/7/docs/api/java/util/Calendar.html#setTime(java.util.Date)。