Answer / Kumar Alok Rajan

In Java, a thread-safe object or method can be used concurrently by multiple threads without causing interference or data inconsistency. Some examples of thread-safe classes in Java are `Vector`, `Hashtable`, and `synchronized` methods and blocks.

4.1 Supply contracts (in the form of comments specifying pre- and post conditions) for the enqueue() method of the LinkedQueue class given in the Appendix. (2) 4.2 Let Thing be a class which is capable of cloning objects, and consider the code fragment: Thing thing1 = new Thing(); //(1) Thing thing2 = thing1; //(2) Thing thing3 = (Thing) thing1.clone(); //(3) Explain how the objects thing2 and thing3 differ from each other after execution of the statements. (

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