How to clone the object in java

Question

org.apache.cxf.jaxrs.ext.multipart.Attachment attachments=null;

List<Attachment> clone = new ArrayList<Attachment>(attachments.size());
for(Object item: attachments) 
clone.add((Attachment)item.clone());//The method clone() from the type Object is not visible

I want to clone the List<Attachment> clone object but it saying The method clone() from the type Object is not visible

Answer 1

Do not use Java standard clone method from Object. At least not before you read what Josh Bloch says about cloning in his book Effective Java.

You need to do a deep copy in this case i.e create an empty ArrayList of Attachment objects (which you did) and copy the values of all the fields of every Attachment object.