2) If you make a subclass of cloneable class then it's cloneable too (even if you don't want). That's why you should override clone () method in a proper way to avoid possible problems. 3)First version of java
In java, it essentially means the ability to create an object with similar state as the original object. 什么是clone 字典中的意思就是复制(强调跟原来的一模一样)。 *By default, java cloning is ‘field by field copy’ *.由于Object类不知道详细类的结构,无法确定哪个clone方法将被调用。 所以JVM规...
上述代码构建了一个User类,并且实现了java.lang.Cloneable接口。顾名思义,Cloneable的意思就是说明这个类可以被克隆的意思。 而我们先去看看java.lang.Cloneable这个接口有些什么。 /* * @(#)Cloneable.java 1.17 05/11/17 * * Copyright 2006 Sun Microsystems, Inc. All rights reserved. * SUN PROPRIETARY/C...
接下来要重点介绍一下使用java.lang.Serializable来实现对象的深度克隆。 首先,我们编写一个工具类并提供cloneTo()方法。 import java.io.ByteArrayInputStream; 1. import java.io.ByteArrayOutputStream; 1. import java.io.IOException; 1. import java.io.ObjectInputStream; 1. import java.io.ObjectOutputStr...
* @see java.lang.CloneNotSupportedException * @see java.lang.Object#clone() * @since JDK1.0 */ publicinterfaceCloneable { } 不要惊讶,没错,除了一大堆的鸡肠以外,这个接口没有定义任何的方法签名。也就是说,我们要克隆一个对象,但是他又不给我提供一个方法。那该怎么办呢?不怕,我们还有全能的Object...
emp and clonedEmp == test: false: It means that emp and clonedEmp are two different objects, not referring to the same object. This is in agreement with the java object cloning requirement. emp and clonedEmp HashMap == test: true: So both emp and clonedEmp object variables refer to th...
在Java语言中，用简单的赋值语句是不能满足这种需 求的。要满足这种需求虽然有很多途径，但实现clone（）方法是其中最简单，也是最高效的手段。Java的所有类都默认继承java.lang.Object类，在java.lang.Object类中有一个方法clone()。JDK API的说明文档解释这个方法将返回Object对象的一个拷贝。要说明的...
By convention, the object returned by this method should be independent of this object (which is being cloned). To achieve this independence, it may be necessary to modify one or more fields of the object returned by super.clone before returning it. Typically, this means copying any mutable ...
* by {@code super.clone} before returning it. Typically, this means * copying any mutable objects that comprise the internal "deep structure" * of the object being cloned and replacing the references to these * objects with references to the copies. If a class contains only ...
一、新建项目,选择Spring Initializr 二、配置一些基本信息(比如包名) 三、选择依赖(入门的话只选择Web选项卡中的Spring Web即可) 四、进入项目,等待依赖下载完成 可以看到包下已经有一个Java文件了: 如果pom.xml找不到parent的版本,红了: 不要紧的!下一步!(当然也可以改成某个低... ...