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Cloneable is a TAGGED or MARKER interface
A class implements the Cloneable interface to indicate to the Object.clone() method that it is legal for that method to make a field-for-field copy of instances of that class.
The interface Cloneable declares no methods.
Attempts to clone instances that do not implement the Cloneable interface result in the exception CloneNotSupportedException being thrown.
You want to override clone() to make it public instead of protected. For example, public Object clone() throws CloneNotSupportedException {
return super.clone();
}
If all your clone() methods call super.clone(), as is recommended, then eventually it will get passed up the inheritance chain all the way to Object.clone() to do the actual cloning, which is why you want to implement the Cloneable interface, so Object.clone() will agree to do it.
If it does not get passed to Object.clone() eventually, then you do not need to implement Cloneable.
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What is markable interface in java?
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