clone « collection « Java Collection Q&A

1. Quick Java question: Cloning and subtracting sets - does this work?    stackoverflow.com

private HashMap<DataObject, HashSet> AllDataObjects;

...

/** Returns all DataObject elements that are NOT in the specified set. */
private DataObject[] invert( HashSet<DataObject> set )
{
    HashSet<DataObject> keys = (HashSet) AllDataObjects.keySet();
   ...

2. Fill an array with clones of a single object    stackoverflow.com

What is a quick and easy way to fill a Java array with clones of a single object? e.g. after:

Rectangle[] rectangles = new Rectangle[N];
fillWithClones(rectangles, new Rectangle(1, 2, 3, 4));

3. Why people are so afraid of using clone() (on collection and JDK classes)?    stackoverflow.com

A number of times I've argued that using clone() isn't such a bad practice. Yes, I know the arguments. Bloch said it's bad. He indeed did, but he said ...

4. How to clone a object containing collection?    coderanch.com

Hi, How to clone a object containing collection. here is my class structure public class ToBeCloned { private String str1= null; private String str2 = null; private List list1= new ArrayList(); // Holds objects of type ToBeCloned //getter and setter methods } I tried to clone an object of this type. I implemented Cloneable interface and overridden clone method as follows ...

5. clone collection and save the realtion between the entries in the collection    coderanch.com

Hey, I suspect that there is no generic solution for this question , but i will try. I have a collection (A) of entities (ejb3 ) "Foo" i need to clone this collection and to clean the data base id from the entities . After clone i have a clone collection (B) The issue is that i need to save in ...

6. Clone collection objects    forums.oracle.com