can use for containing arbitrarily large collections of objects. • To use: import java.util.*; • Some basic Collection classes: – ArrayList – Vector – HashMap – Hashtable (yes‚ that’s a small t) HashMap • ArrayList is usually mentioned as ArrayList – E is the object type that it will contain. – ArrayList means that we want an ArrayList that can contain BankAccounts. • HashMap‚ however‚ is defined as HashMap – K is the object type that will be used as a key. • HashMaps do not use
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Abstraction refers to the ability to make a class abstract in OOP. An abstract class is one that cannot be instantiated. All other functionality of the class still exists‚ and its fields‚ methods‚ and constructors are all accessed in the same manner. You just cannot create an instance of the abstract class. If a class is abstract and cannot be instantiated‚ the class does not have much use unless it is subclass. This is typically how abstract classes come about during the design phase. A parent
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GRADE 12 INFORMATION TECHNOLOGY MOCK EXAM Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. __a__ 1. In an automated information processing system a scanner is used for a. | data capture | c. | presentation | b. | processing | d. | Distribution | __c__ 2. Which of the following are examples of manual information systems: I Pages of a story book. II A collection of folders in a filing cabinet III A payroll
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Chapter 3 Study Guide Name: ____________________ 1. In Java‚ methods must include all of the following except ___________. a. a declaration b. a call to another method c. curly braces d. a body 2. All method declarations contain ___________. 3. A public static method named computeSum() is located in classA. To call the method from within classB‚ use the statement ___________. 4. Which of the following method declarations
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1. Introduction The following subsections of the Software Requirements Specifications (SRS) document should provide an overview of the entire SRS. The thing to keep in mind as you write this document is that you are telling what the system must do – so that designers can ultimately build it. Do not use this document for design!!! 1.1 Purpose Identify the purpose of this SRS and its intended audience. In this subsection‚ describe the purpose of the particular SRS and specify the
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Structure Training Guide • Training Guide • Training Guide Revision Log Date 12/10/04 27/04/05 19/09/05 Page(s) Various Various Various Revision 01 02 03 Description of Revision Modified for M3SP2 Modified for M3SP3 Modified for M3SP4 Release M3SP2 M3SP3 M3SP4 Updates Updates to this manual will be issued as replacement pages and a new Update History Sheet complete with instructions on which pages to remove and destroy‚ and where to insert the new sheets. Please ensure that you
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ENTS 640 Networks and Protocols I Fall 2013 Solutions to Homework #5 Assigned: October 19; Due: October 24 H5.1 Write a Java application with a simple class inheritance hierarchy. As shown in the UML diagram below‚ it should consist of three classes. The Student class‚ representing a student’s personal and course registration information for a given semester‚ which will be the superclass. The two subclasses inheriting from the Student class are the FullTimeStudent class‚ representing a full-time
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NAME: NUMBER: CSE 1020 3.0 Introduction to Computer Science I Final Exam‚ Summer 2012 90 Minutes Name: Student Number: CSE email: Note: Complete all questions in the space provided. Do not separate pages. Ensure your name and student number are on all pages. This is a closed-book test. No external aids are permitted. DO NOT OPEN THE BOOKLET UNTIL INSTRUCTED TO DO SO 1/8 NAME: NUMBER: Consider the following Java program fragment String s = “radar”; boolean result = true; for(int i=0;i<s
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Chapter 4 The Enhanced E-R Model and Business Rules Chapter Objectives The purpose of this chapter is to present some important extensions to the E-R model (described in Chapter 3) that are useful in capturing additional business meaning. In particular we describe two types of extensions to the E-R model. The enhanced entity-relationship (EER) model includes constructs for supertype/subtype relationships. The inclusion of new notation for business rules allows the designer to capture
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IT111P WEEK 7-1 ABSTRACT CLASSES ABSTRACT Before anything‚ take a look at the code below ABSTRACT How do we use them? ABSTRACT Abstract classes CANNOT be instantiated. So what are they good for? How can you use them? You might say that abstract classes are meant to be inherited It contains abstract methods Abstract methods are methods with no definition If abstract methods have no definition‚ how can you use them? ABSTRACT The derived class implements the abstract method’s
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