我们可以用下图对浅克隆进行展示：在Java语言中，通过实现Cloneable接口，默认覆盖Object类的clone()方法就...
* A class implements the Cloneable interface to indicate to the {@link java.lang.Object#clone()} method that * it is legal for that method to make a field-for-field copy of instances of that class. */ public interface Cloneable { } 1. 2. 3. 4. 5. 6. 可以看出Cloneable是一个空接...
* performs a "shallow copy" of this object, not a "deep copy" operation. * <p> * The class {@codeObject} does not itself implement the interface * {@codeCloneable}, so calling the {@codeclone} method on an object * whose class is {@codeObject} will result in throwing an * excep...
Exception in thread "main" java.lang.CloneNotSupportedException: com.heatdeath.test_package.CloneDemo$CloneClass at java.lang.Object.clone(Native Method) at com.heatdeath.test_package.CloneDemo$CloneClass.clone(CloneDemo.java:14) at com.heatdeath.test_package.CloneDemo.main(CloneDemo.java:23) ...
早期Java支持接口形式的“声明多继承” 早期Java不支持任何“实现多继承”(简称“多继承”)。从Java 8开始可以通过接口的default method实现。 把上述几条结合起来,就得到了Cloneable接口这个糟糕的设计。 怎么说呢? 首先,我们要能标记出哪些类是可以clone的。在Java里,类型层面的元数据可以用几种方法来表示: ...
If a class and all of its superclasses (except Object) obey this convention, it will be the case that x.clone().getClass() == x.getClass(). By convention, the object returned by this method should be independent of this object (which is being cloned). To achieve this independence, ...
* Simple example of overriding clone() method in Java to understand How Cloning of 5 * Object works in Java. 6 * 7 * @author 8 */ 9 public class JavaCloneTest { 10 private static final Logger logger = Logger.getLogger(JavaCloneTest.class); ...
Object obj = super.clone(); //utilize clone Object method Employee emp = (Employee) obj; // deep cloning for immutable fields emp.setProps(null); Map<String, String> hm = new HashMap<>(); String key; Iterator<String> it = this.props.keySet().iterator(); ...
java.lang.CloneNotSupportedException All Implemented Interfaces: Serializable Direct Known Subclasses: ServerCloneException public classCloneNotSupportedExceptionextendsException Thrown to indicate that theclonemethod in classObjecthas been called to clone an object, but that the object's class does not impl...
因为Java中并不是所有的类都可以被克隆(而且JDK中还描述说不能保证某些类clone的结果x.clone()!=x绝对成立),所以Object类对象无法调用clone()...还有super不是指Object而是指其父类的引用。由于clone是object类的一个protected方法，代码中不能直接调用它 子类只能受保护的clone方法克隆他自己，为此必须...