SKILL BENCHMARK

Java Object-Oriented Programming Literacy

  • 26m
  • 26 questions
The Java Object-Oriented Programming Literacy benchmark measures your understanding of writing appropriate constructors, the role of the default constructor provided by Java, correct getter and setter methods, and method overloading in classes. A learner who scores high on this benchmark demonstrates they have the skills to recognize class hierachies, work with byte and character streams in Java, and understand overriding principles.

Topics covered

  • apply method overriding and recognize the concept of hiding
  • apply the skip and available methods of FileInputStream objects and identify when the end of a byte stream has been reached
  • apply the two ways of initializing derived classes - implement an explicit no argument constructor in the base class or use the super keyword and have only parameterized constructors in both the base and derived classes
  • combine method overriding with fairly complex inheritance hierarchies
  • completely and correct implement the .hashCode contract
  • copy a character file as a sequence of characters using the FileReader and FileWriter classes
  • copy any file as a sequence of bytes using the FileInputStream and FileOutputStream classes
  • correctly override the .hashCode method and write the code to correctly override the .equals method, which is inherited from java.lang.Object
  • define and invoke multiple constructors to instantiate objects of a class
  • define getter and setter methods to work with access protected member variables
  • describe the initialization of member variables of class objects
  • identify the role of access modifiers and recognize the basics of constructors
  • identify what happens when there is a base and derived class that have many different constructors
  • make use of method overloading in your programs
  • override the method .toString, which is inherited from java.lang.Object
  • read a byte stream using the InputStream and FileInputStream classes
  • read a character stream using the FileReader and FileReader classes
  • recognize how static methods are bound using compile-time rather than run-time binding
  • recognize how when you add your own constructor, Java takes away the default no-argument constructor it had provided
  • recognize Java's class hierarchy for byte and character streams
  • recognize that a base class's constructor is invoked when a derived class object is instantiated
  • recognize that static methods don't support run-time polymorphism
  • use advanced forms of overriding
  • use the this keyword appropriately inside getter and setter methods of a class
  • use the this keyword appropriately inside the constructor and other methods of a class
  • write a byte stream using the OutputStream and FileOutputStream classes

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