Java 中的日期克隆()方法，示例

原文:https://www . geesforgeks . org/date-clone-method-in-Java-with-examples/

Java 中 Date 类的 clone()方法返回传递的 Date 对象的副本。这个副本只是给定日期对象的一个浅层副本。 语法:

public Object clone()

参数:该方法不接受任何参数。 返回值:该方法返回对象的克隆。 以下程序说明了克隆()方法的使用: 例 1:

Java 语言(一种计算机语言，尤用于创建网站)

// Java code to demonstrate
// clone() method of Date class

import java.util.Date;
import java.util.Calendar;

public class GfG {
    public static void main(String args[])
    {

        // Creating a Calendar object
        Calendar c1 = Calendar.getInstance();

        // Set Month
        // MONTH starts with 0 i.e. ( 0 - Jan)
        c1.set(Calendar.MONTH, 11);

        // Set Date
        c1.set(Calendar.DATE, 05);

        // Set Year
        c1.set(Calendar.YEAR, 1996);

        // Creating a date object
        // with specified time.
        Date dateOne = c1.getTime();

        Object dateTwo = dateOne.clone();

        System.out.println("Original Date: "
                           + dateOne.toString());
        System.out.println("Cloned Date: "
                           + dateTwo.toString());
    }
}

Output: 

Original Date: Thu Dec 05 05:39:04 UTC 1996
Cloned Date: Thu Dec 05 05:39:04 UTC 1996

例 2:

Java 语言(一种计算机语言，尤用于创建网站)

// Java code to demonstrate
// clone() method of Date class

import java.util.Date;
import java.util.Calendar;

public class GfG {
    public static void main(String args[])
    {

        // Creating a Calendar object
        Calendar c1 = Calendar.getInstance();

        // Set Month
        // MONTH starts with 0 i.e. ( 0 - Jan)
        c1.set(Calendar.MONTH, 00);

        // Set Date
        c1.set(Calendar.DATE, 30);

        // Set Year
        c1.set(Calendar.YEAR, 2019);

        // Creating a date object
        // with specified time.
        Date dateOne = c1.getTime();

        Object dateTwo = dateOne.clone();

        System.out.println("Original Date: "
                           + dateOne.toString());
        System.out.println("Cloned Date: "
                           + dateTwo.toString());
    }
}

Output: 

Original Date: Wed Jan 30 05:39:10 UTC 2019
Cloned Date: Wed Jan 30 05:39:10 UTC 2019

参考:https://docs . Oracle . com/javase/8/docs/API/Java/util/date . html # clone–

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