Code behind: class A implements Cloneable { int i, j; A(int i, int j) { this.i = i; this.j = j; } A() { } } class B extends A { int l, m; B() { } B(int l, int m) { this.l = l;...

Consider the following from Effective Java Item 11 (Override clone judiciously) where Josh Bloch is explaining what is wrong with the clone() contract . There are a number of problems with this ...

The Java specification for the java.lang.Cloneable interface defines itself as signifying that any object that extends it also has implemented the clone() method that rests dormant within java.lang...

The following compiles fine: Object o = new Object(); System.out.println(o instanceof Cloneable); But this doesn't: String s = new String(); System.out.println(s instanceof Cloneable); A ...

In terms of "best practices", which methodology is preferred for creating a "deep copy" of an object?

I am trying to create a shallow copy (new instance) of an object, without manually setting each field. This object is not a type I have the ability to modify, so I cannot go into the object and imp...

Java provides java.io.Serializable and java.lang.Cloneable in his standard library (and special support for it in the language and the JVM) for tasks around deserializing/serializing/cloning. Has ...

I am using an inner class that is a subclass of a HashMap. I have a String as the key and double[] as the values. I store about 200 doubles per double[]. I should be using around 700 MB to sto...

I'm maintaing an older Java code base (jvm 1.4) that seems to use cloning as an alternative to object instantiation, I'm guessing as a performance optimization. Here's a contrived example: public ...

I have some code that performs a deep copy using Object.clone, but I'm trying to rewrite it using the more "acceptable" copy constructor technique. Below are two simple examples of what I'm trying ...

Can you explain to me why I should inherit from ICloneable and implement the Clone() method? If I want to do a deep copy, can't I just implement my method? Let's say MyClone()? Why should I inher...

In Effective Java, the author states that: If a class implements Cloneable, Object's clone method returns a field-by-field copy of the object; otherwise it throws CloneNotSupportedException....

If a Java class implements the Serializable interface but does not have a public clone() method, it is usually possible to create a deep copy like this: class CloneHelper { @SuppressWarnings("unc...

Why wasn't the .clone() method specified in the java.lang.Cloneable interface ?