barcode generator source code in vb.net section 5: oo concepts in Java

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section 5: oo concepts
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n 5a
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Write code in which overloaded methods try to box then widen Then try to widen then box Create a class and a subclass and perform legal reference variable upcasting and downcasting Next, write code that won t compile due to casting errors Finally, write code that will throw an exception when attempting a cast Create legal overriding methods that change the following aspects of the method they override: the return type, the access modifier, exceptions thrown Write code that accesses constructors with all four access modifiers Write a singleton class
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n 5b
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n 5c
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n 5d n 5e n 5f
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Write a superclass that requires any of its subclasses to create a no-arg constructor Write a subclass for this superclass Write two classes that interact with each other s state and maintain loose coupling Write several classes such that there is an is-a relationship and a separate has-a relationship
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n 5g
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n 5h
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section 6: collections/Generics
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n 6a
Create an "Items" class that has a String name, and an int value Note that you will use this class in several of this section s exercises, and you may need to enhance this class as you go along For all of 6a, use classes in javautil whenever possible:
n Write a class that makes a collection of Items that guarantees no duplicates n Write a class that makes a collection of Items that can be accessed in
the order in which they were added to the collection
Prototype / Research / Study Projects
n Write a class that creates a collection in which a given instance of Items
can be retrieved using a different associated String called "buyer"
n Write a program that uses some combination of javautil
Comparator and javalangComparable to sort a collection of Items either by name or by value
n 6b
Create an array of Strings and use method(s) in the Arrays class to search the array for the location of specific Strings Demonstrate an unsuccessful search Next, sort the array in reverse order and perform another search Create a collection of Strings and use method(s) in the Collections class to search the collection Demonstrate successful and unsuccessful searches
n 6c
n 6d
Create a List of Longs Create an array that backs the List Change a value in the List and display the contents of the array Change a value in the array and display the contents of the List Attempt to add a new entry to the List Create code that uses an Iterator to print the contents of a collection Create a Set such that only Items can be added Prove it
n 6e n 6f n 6g
Create a Map such that only Strings can be keys and only Items can be values Prove it Create a non-generic collection and retrieve elements from it Make a subclass of Items Create a method that takes only Items or the Items subclass Prove it Write code such that the compiler issues a warning when you mix generic and non-generic collections Write a method that takes an instance of any type, makes an ArrayList of that type, and then adds the original instance to the ArrayList
n 6h n 6i n 6j
n 6k
section 7: Fundamentals
n 7a
Create a compiler error concerning a final primitive Create an error concerning a final reference variable Attempt to change the state of an instance whose reference variable is final
4: Coding Exercises
n 7b n 7c
Write code that proves a short-circuit operator is short-circuiting, and that a non-short-circuit operator isn t short-circuiting Write code that determines whether the integer value of args[0] is evenly divisible by the integer value of args[1] Write code that uses a ternary operator to populate a String with either success or failure based on whether args[0] can be parsed to an int Write code that demonstrates how postfix operators affect loop operations differently than prefix operators Write a program that adds two name-value pairs to javautil Properties: one pair via a command-line option and one via a method in Properties Next, print all the system s properties to verify that the two new properties were added Although difficult to prove, write code that creates instances of a class that are referred to by other instances, and yet are still eligible for garbage collection Create a class that has a method such that the first time the garbage collector attempts to collect a given instance, this method will keep the garbage collector from collecting that instance at that point Create code that passes primitives and reference variables into methods, demonstrating how pass by value works for primitives and reference variables Although not strictly on the exam, create a class and put it in a JAR file Create a second class that uses the class in the JAR file Write a class that uses a static import Write a class that lives in a package Write another class in another package that successfully uses methods from the first class
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