Java 日历 clone()方法及示例
Java 日历 clone()方法及示例
Calendar类中的 clear() 方法是用来克隆一个日历对象的。它基本上是为这个对象创建一个浅层的副本。
语法
public Object clone()
参数： 该方法不接受任何参数。
返回值： 该方法不返回任何值。
下面的程序说明了日历类的clone()方法的工作原理：
例1 :
// Java Code to illustrate clone() Method
import java.util.Calendar;
public class CalendarClassDemo {
public static void main(String args[])
{
// Creating a calendar object
Calendar calndr1 = Calendar.getInstance();
// Displaying current calendar
System.out.println("Original calendar: "
+ calndr1.getTime());
// Cloning the original
Calendar calndr2 = (Calendar)calndr1.clone();
// Displaying the Copy
System.out.println("Cloned calendar: "
+ calndr2.getTime());
}
}
输出:
Original calendar: Tue Feb 12 11:41:36 UTC 2019
Cloned calendar: Tue Feb 12 11:41:36 UTC 2019
例2 :
// Java Code to illustrate clone() Method
import java.util.*;
public class CalendarClassDemo {
public static void main(String args[])
{
// Creating a calendar object
Calendar calndr1
= new GregorianCalendar(2018, 12, 2);
// Displaying current calendar
System.out.println("Original calendar: "
+ calndr1.getTime());
// Cloning the original
Calendar calndr2 = (Calendar)calndr1.clone();
// Displaying the Copy
System.out.println("Cloned calendar: "
+ calndr2.getTime());
}
}
输出:
Original calendar: Wed Jan 02 00:00:00 UTC 2019
Cloned calendar: Wed Jan 02 00:00:00 UTC 2019
**参考资料: **https://docs.oracle.com/javase/7/docs/api/java/util/Calendar.html#clone()