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Clone() has a series of pitfalls like pointed out in "Effective Java" by Joshua Bloch, so a copy constructor should be used instead.

In Java there isn't a default copy constructor like in C++, so it has to be created.

Copying requires more processing than passing a reference, however it's very useful for returning defensive copies of internal objects in accessors and reduce mutability.

Here's an example of copy constructor:

	class Example {
		
		private int value;

		public Example(Example example) {
			this.value = example.value;  
		}
	}