Download
1 / 8
80 likes | 81 Views
CSCI 3328 Object Oriented Programming in C# Chapter 9 : Classes and Objects: A Deeper Look – Exercises. Xiang Lian The University of Texas Rio Grande Valley Edinburg, TX 78539 xiang.lian@utrgv.edu. Objectives. In this chapter, you will do some exercises about: classes and objects
E N D
CSCI 3328 Object Oriented Programming in C# Chapter 9: Classes and Objects: A Deeper Look – Exercises Xiang Lian The University of Texas Rio Grande Valley Edinburg, TX 78539 xiang.lian@utrgv.edu
Objectives • In this chapter, you will do some exercises about: • classes and objects • Keywords such as this, static, readonly
Multiple Choices • A static method in the string class, called _______, is similar to method Console.Write, but returns a formatted string rather than displaying a string in a console window. • A. ToString B. Format C. WriteLine D. Static • If a method contains a local variable with the same name as one of its class's fields, the local variable ________ the field in that method's scope. • A. removes B. replaces the memory of C. hides D. is hidden by • The ______ is called by the garbage collector just before it reclaims an object's memory. • A. constructor B. method C. destructor D. variable • If a class declares constructors, the compiler will not create a(n) __. • A. method B. default constructor C. destructor D. variable • An object's _______method can be called implicitly when an object appears in code where a string is needed. • A. constructor B. destructor C. ToString D. [ ]
Multiple Choices (cont'd) • A(n) _____ variable represents classwide information that is shared by all the objects of the class. • A. object B. private C. static D. public • Declaring an instance variable with keyword _____ specifies that the variable is not modifiable. • A. static B. private C. readonly D. ref • Properties can contain both ______accessors. • A. return and value B. get and value C. get and set D. set and return • Keyword _____introduces a class definition. • A. newclass B. classdef C. VC#class D. class
Multiple Choices (cont'd) • A class can yield many _____, just as a primitive data type can yield many values • A. names B. objects (instances) C. values D. types • Variables can be initialized ____. • A. when they are declared B. to their default values C. in a constructor D. All of the above • Instance variables declared private are not accessible_____. • A. outside the class B. by other methods of the same class C. inside the same class D. All of the above.
True/False Statements • You can use properties of an object in the select clause of an LINQ query. • An object initializer first calls the class's constructor, then assigns the specified property values. • Base-class constructors are not inherited by derived classes. • Inheritance encourages the reuse of proven high-quality software.
True/False Statements (cont'd) • When a derived class redefines a base-class method, by using the same signature and return type, the derived class is said to overload that base-class method. • A base class's private members are accessible anywhere that the application has a reference to an object of that base class or to an object of any of its derived classes. • When an object of a derived class is instantiated, a base class constructor is called implicitly or explicitly. • Derived-class constructors can call base class constructors via the base keyword.
