Section 4: Concurrency in Java

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APPENDIX C
QR-Code Creation In Java
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Scanner classes and the PrintWriterformat/printf methods Recognize and use formatting parameters (limited to: %b, %c, %d, %f, %s) in format strings
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For string pattern matching using regular expressions, and formatting and tokenizing values, see 12, p 531
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Section 4: Concurrency
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41 Recognize the states in which a thread can exist, and identify ways in which a thread can transition from one state to another
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For thread states, see Section 136, p 634
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Given a scenario, write code that makes appropriate use of object locking to protect static or instance variables from concurrent access problems
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For object locking, see Section 135, p 626
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Section 5: OO Concepts
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For OO concepts, see 7, p 283
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51 52
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Develop code that implements tight encapsulation, loose coupling, and high cohesion in classes, and describe the benefits Given a scenario, develop code that demonstrates the use of polymorphism Further, determine when casting will be necessary and recognize compiler vs runtime errors related to object reference casting Explain the effect of modifiers on inheritance with respect to constructors, instance or static variables, and instance or static methods Develop code that implements is-a and/or has-a relationships
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53 54
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Section 6: Collections / Generics
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For generics and collections, see 14, p 661, and 15, p 747, respectively
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Given a design scenario, determine which collection classes and/or interfaces should be used to properly implement that design, including the use of the Comparable interface Write code that uses the generic versions of the Collections API, in particular, the Set, List, and Map interfaces and implementation classes Recognize the limitations of the non-generic Collections API and how to refactor code to use the generic versions Write code that uses the NavigableSet and NavigableMap interfaces
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APPENDIX C
Decode Bar Code In .NET
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Develop code that makes proper use of type parameters in class/interface declarations, instance variables, method arguments, and return types; and write generic methods or methods that make use of wildcard types and understand the similarities and differences between these two approaches
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For generics, see 14, p 661
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Use capabilities in the javautil package to write code to manipulate a list by sorting, performing a binary search, or converting the list to an array Use capabilities in the javautil package to write code to manipulate an array by sorting, performing a binary search, or converting the array to a list Use the javautilComparator and javalangComparable interfaces to affect the sorting of lists and arrays Furthermore, recognize the effect of the natural ordering of primitive wrapper classes and javalangString on sorting
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Section 7: Fundamentals
71 Given an example of a class and a command-line, determine the expected runtime behavior
For program arguments, see Section 39, p 95
Given the fully-qualified name of a class that is deployed inside and/or outside a JAR file, construct the appropriate directory structure for that class Given a code example and a classpath, determine whether the classpath will allow the code to compile successfully
For classpath and JAR files, see Section 43, p 117, and Section 44, p 120, respectively
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Appendix D
Annotated Answers to Review Questions
1 Basics of Java Programming
11 (d) A method is an operation defining the behavior for a particular abstraction Java implements abstractions using classes that have properties and behavior Behavior is defined by the operations of the abstraction 12 (b) An object is an instance of a class Objects are created from classes that implement abstractions The objects that are created are concrete realizations of those abstractions An object is neither a reference nor a variable 13 (b) (2) is the first line of a constructor declaration A constructor in Java is declared like a method, except that the name is identical to the class name, and it does not specify a return value (1) is a header of a class declaration, and (3), (4), and (5) are instance method declarations 14 (b) and (f) Two objects and three reference variables are created by the code Objects are normally created by using the new operator The declaration of a reference variable creates a variable regardless of whether a reference value is assigned to it or not 15 (d) An instance member is a field or an instance method These members belong to an instance of the class rather than the class as a whole Members which are not explicitly declared static in a class declaration are instance members