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Because list stores Object references, it can store a reference to Integer as well as it can store a reference to String However, if you intended list to hold only strings, then the preceding statement would corrupt the collection Again, the compiler had no way to know that the preceding statement is invalid The second problem with pre-generics collections is that when you retrieve a reference from the collection, you must manually cast that reference into the proper type This is why the preceding program casts the reference returned by next( ) into String Prior to generics, collections simply stored Object references Thus, the cast was necessary when retrieving objects from a collection Aside from the inconvenience of always having to cast a retrieved reference into its proper type, this lack of type safety often led to a rather serious, but surprisingly easy-to-create, error Because Object can be cast into any type of object, it was possible to cast a reference obtained from a collection into the wrong type For example, if the following statement were added to the preceding example, it would still compile without error, but generate a run-time exception when executed:

Integer i = (Integer) itrnext();

1 * 15 *

Recall that the preceding example stored only references to instances of type String in list Thus, when this statement attempts to cast a String into an Integer, an invalid cast exception results! Because this happens at run time, this is a very serious error The addition of generics fundamentally improves the usability and safety of collections because it

* 1 * *

Ensures that only references to objects of the proper type can actually be stored in a collection Thus, a collection will always contain references of a known type Eliminates the need to cast a reference retrieved from a collection Instead, a reference retrieved from a collection is automatically cast into the proper type This prevents run-time errors due to invalid casts and avoids an entire category of errors

Part II:

* * * 15

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These two improvements are made possible because each collection class has been given a type parameter that specifies the type of the collection For example, ArrayList is now declared like this: class ArrayList<E> Here, E is the type of element stored in the collection Therefore, the following declares an ArrayList for objects of type String:

1 D A multitasking operating system constantly switches CPU time between loaded processes, creating the impression that the CPU is actually executing processes concurrently A, B, and C are incorrect A describes a multiprocessing operating system B describes a distributed processing operating system C is only possible if the CPU is a dual-core CPU Even then, it can only execute two processes at a time 2 A Because the command was entered from the shell prompt, a user process was created B, C, and D are incorrect B and C would only be created if the process were a system process loaded through an init script D is not a type of process and is incorrect 3 A Because the command was entered from the shell prompt, its parent process is the bash process, which has a PID of 3456 B, C, and D are incorrect B is incorrect because the su process didn t create the vi process C is incorrect because this PID is the PID of the vi process itself D is incorrect because the PID isn t the PID of the parent process 4 B The init process is the grandparent of all other Linux processes on the system All other processes can trace their heredity to init A, C, and D are incorrect A may be the parent of many processes, but it is still a descendant of the init process The same is true of C D is incorrect It s the process name for the ps command

ArrayList<String> list = new ArrayList<String>();

Now, only references of type String can be added to list The Iterator and ListIterator interfaces are now also generic This means that the type parameter must agree with the type of the collection for which the iterator is obtained Furthermore, this type compatibility is enforced at compile time The following program shows the modern, generic form of the preceding program:

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