Title: Java Eclipse-Cloning
Description: This video demonstrates the use of object cloning. Cloning is an important but tricky concept. It is easy to clone basic types such as int and double. But cloning objects (such as Employee) needs to be approached with caution. Members of objects can be objects themselves and need to be cloned as well. Otherwise changing one object will affect the other. In the first part of the video, we show how to clone an array. In this case, Java already supports cloning arrays of basic types. In the second part, we created an Employee class that contains a hire date (object within an object). We implement the Cloneable interface, and showed how to implement the clone method by creating a clone of the fire date. The names need not be cloned since they are strings (and strings are immutable).
Methodology: Good coding standards and object-oriented design.
Technologies: Java, object-oriented programming.
Examples constructed: The first example shows how to create a clone of an array. We declared an array with few int members and created another array that contains a clone of the original (using the clone() method). In the second example, we created an employee class with a hire date to show how the cloning works when we have a mutable object within another object.
Keywords: class, array, clone, Cloneable, implements, interface.