object oriented programming using java question bank

... for the standard Java API was produced usingjavadoc Javadoc documentation is prepared from special comments that are placed in theJava source code file Recall that one type of Java comment begins ... extent on the version of JAVA that you are using,but in the standard JAVA 5.0, they are stored in jar files in a subdirectory of themain JAVAinstallation directory A jar (or “JAVAarchive”) file is ... documentation, you need to run the javadoc tool.You can use javadoc in a command line interface similarly to the way that the javacand java commands are used Javadoc can also be applied in the

Ngày tải lên: 12/08/2014, 21:21

... express the behavior of the objects This is a powerful idea However, something like this can be done in most programming languages The cen-tral new idea in object-oriented programming–the idea that ... Sequence Diagrams show objects and a sequence of method calls they make toother objects.• Collaboration Diagrams show objects and their relationship, putting emphasis on the objects that participate ... for Object Oriented software design and has limited use for otherprogramming paradigms UML is not a method by itself, however it was designed to be compatible with theleading object-oriented software

Ngày tải lên: 12/08/2014, 21:21

... . . 101 THIS SECTION simply pulls together a few more miscellaneous features of object oriented programming in Java. Read it now, or just look through it and refer back to it later when you need ... know about the first topic, interfaces, almost as soon as we begin GUI programming.) 5.1 Interfaces Some object-oriented programming languages, such as C++, allow a class to extend two or more ... Drawable object that draws a filled, red, 100-pixel square. Rather than defining a new, separate class and then using that class to create the object, we can use an anonymous class to create the object

Ngày tải lên: 12/08/2014, 21:21

... handling events in JAVA Alistener is an object that includes one or more event-handling methods When anevent is detected by another object, such as a button or menu, the listener object is notified ... detected or generated by an object Another object, the listener, has theresponsibility of responding to the event The event itself is actually represented by a third object, which carries information ... an object be-longing to the classActionEvent The event that is generated is associated with thebutton; we say that the button is thesourceof the event The listener object in thiscase is an object

Ngày tải lên: 12/08/2014, 21:21

... stexcep-atement more fully Thesyntax of the throw statement is:throw exception−object ; The exception-object must be an object belonging to one of the subclasses ofThrowable Usually, it will in fact ... design of Java makes it impossible for programmers to ignore the possibility ofsuch errors Among the exceptions that require mandatory handling are several that can occurwhen using Java’s input/output ... Although early versions of Java did not have assertions, an assertion facility ilar to the one in C/C++ has been available in Java since version 1.4 As with theC/C++ version, Java assertions can be

Ngày tải lên: 12/08/2014, 21:21

... Different Programming Paradigms 3) Why use the Object Oriented Paradigm 4) Object Oriented Principles 5) What Exactly is Object Oriented Programming? 6) The Benefits of the Object Oriented Programming ... Oriented Principles 1.5 What Exactly is Object Oriented Programming? 1.6 The Benefi ts of the Object Oriented Programming Approach 2.4 UML Package Diagrams 2.5 UML Object Diagrams 11 12 12131516192323 ... money) Object oriented programming it a method of programming that involves the creation of intellectuals objects that model a business problem we are trying to solve (e.g a bank account, a bank

Ngày tải lên: 01/04/2021, 14:35

... 1Java Object-Oriented ProgrammingOutline 1 Introduction 2 Superclasses and Subclasses 3 protected Members 4 Relationship between Superclass Objects and Subclass Objects 5 Implicit Subclass-Object-to-Superclass-Object ... 31 Introduction (II)• Object-Oriented Programming – Introduce protected member access – Relationships • "is a" - inheritance – Object of subclass "is a" object of the superclass ... Implementation 16 Case Study: Creating and Using Interfaces 17 Inner Class Definitions 18 Notes on Inner Class Definitions Trang 21 Introduction• Object-Oriented Programming (OOP) – Inheritance - form

Ngày tải lên: 31/03/2014, 20:20

... Used with objects • Using the "." operator and preceded with object name • Ex: myCircle.radius ClassName objectName; objectName = new ClassName(); Trang 12Using Objects: using methods™ ... 1Web Programming with JavaJava Object-Oriented Programming Huynh Huu Viet Email: viethh@uit.edu.vn Department of Information Systems Trang 2ƒ Inheritance & Polymorphism™ Some useful Java ... overloaded ™ This offers greater flexibility and convenience of creating objects Trang 11Using Objects (1)™ Object initialization ™ Using Member Variables ƒ Member variable declaration • Any where in

Ngày tải lên: 27/06/2014, 21:20

... the Internet Java Methods Object-Oriented Programming and Data Structures Maria Litvin ● Gary Litvin Copyright © 2011 by Maria Litvin, Gary Litvin, and Skylight Publishing All Trang 2Objectives: ... devise effective algorithms • Be proficient with the syntax and style of programming languages • Diagnose and correct programming errors Continued Trang 17Software Engineers are Able To: • Use ... components and terms: CPU, memory, Trang 3The text for this chapter is online at: www.skylit.com/javamethods Trang 4Hardware • The CPU (Central Processing Unit) is made of millions of semiconductor

Ngày tải lên: 04/11/2020, 23:13

... 19Console Applications C:\javamethods\Ch02> path=%PATH%;C:\Program Files\Java\jdk 1.5.0_07\bin C:\javamethods\Ch02> javac Greetings2.java C:\javamethods\Ch02> java Greetings2 Enter your ... • Many additional Java resources on the Internet http://www.oracle.com/technetwork/java/javase/downloads/ Trang 17Java IDE • GUI front end for JDK • Integrates editor, javac, java, appletviewer, ... Publishing All rights reserved Chapter 2 Java Methods Object-Oriented Programming and Data Structures Maria Litvin ● Gary Litvin 2nd AP edition with GridWorld Trang 2Objectives: • Understand the software

Ngày tải lên: 04/11/2020, 23:13

... Trang 1TNT NS Java Methods METHODS Object-Oriented Programming and Data Structures 2nd AP edition with GridWorld Objects and Classes Copyright © 2011 by Maria ... interacting objects e An object can create other objects e An object can call another object’s (and Its own) methods (that Is, “send messages’) e An object has data fields, which hold values that ... SomeClass.java \_ public class SomeClass ——\ Class header se Fields ——— object’s state; can hold numbers, characters, strings, other objects Procedures for constructing ° Constructors a new object

Ngày tải lên: 04/11/2020, 23:13

... iterations? • How is pseudocode different from Java code? • Name three basic shapes used in flowcharts. • Explain how variables are used in iterations. • Which Java statements can be used to express ... variables (The “running time” depends on n, of course) General: works for any n Trang 11Python C/C++Javapublic class MyMath{ public static int addSquares(int n) { int sum = 0; for (int k = 1; ... folder) count   count + totalBytes(X) } return count } Base case(This is pseudocode, not Java!) Trang 21Euclid’s Algorithm two positive integers Trang 22No Trang 23Euclid’s Algorithm (cont’d)

Ngày tải lên: 04/11/2020, 23:14

... 8Programmer-Defined Names • In addition to reserved words, Java uses standard names for library packages and classes: String , Graphics , JFrame , JButton , java.awt , javax.swing • The programmer gives names ... • Can use special javadoc tags:  @param – describes a parameter of a method  @return - describes the method’s return value Trang 6Common styleTrang 7Reserved Words • In Java a number of words ... between /* and weight *= 2.2046; // Convert to kilograms Trang 5Javadoc Comments • Used by the JDK’s special utility program javadoc to automatically generate documentation in HTML format from

Ngày tải lên: 04/11/2020, 23:14

... different data types: int, char, double, boolean, etc • Variables can hold objects; then the type is the class of the object • The programmer gives names to variables • Names of variables usually ... the value of the field radius remains 0.0 Trang 16Java MethodsTrang 17Strings • String is not a primitive data type • Strings work like any other objects, with two exceptions:  Strings in double ... Variables, and Data Structures Maria Litvin ● Gary Litvin 2nd AP edition with GridWorld Trang 2Objectives: • Discuss primitive data types • Learn how to declare fields and local Trang 3mov ax,q

Ngày tải lên: 04/11/2020, 23:14

... refers to another object (the old object is Trang 16A Fraction object:num = 3 denom = 7 A Fraction object: num = 3 denom = 7 f1 f2 f1 f2 Refer to the same object Trang 17 specify the method’s ... class, the method returns a reference to an object (or null) • Often the returned object is created in the method using new For example: • The returned object can also come from a parameter or from ... to the same object refers to Trang 25Passing Parameters (cont’d) • A method can change an object passed to it as a parameter (because the method gets a reference to the original object) • A method

Ngày tải lên: 04/11/2020, 23:15

... GridWorld Trang 2Objectives: commonly used methods extract numbers from strings Character class Trang 3The String class string of characters. • The String class belongs to the java.lang package, ... methods can change the string. several references can point to the same object safely: there is no danger of changing an object through one reference without the others being aware of the change. ... to upper (lower) case Trang 19Integer and Double are “wrapper” classes from java.lang that represent numbers as objects They also provide useful static methods. Trang 20Numbers to Strings (cont’d)

Ngày tải lên: 04/11/2020, 23:15

... All rights reserved. Java Methods Object-Oriented Programming and Data Structures Maria Litvin ● Gary Litvin 2nd AP edition with GridWorld C  h  a  p  e  t  r  Trang 2Objectives: polymorphism ... 2Objectives: polymorphism constructors and methods Trang 3Inheritance between objects: an object of a subclass IS-A(n) object of the superclass Superclass (Base class) Subclass (Derived class) Subclass ... 10Abstract Classes (cont’d) create objects of) abstract classes they can be called from constructors of subclasses concrete Trang 11• Object is a concrete class public class Object { public String toString

Ngày tải lên: 04/11/2020, 23:16

... as Objects • In Java, an array is an object If the type of its elements is anyType, the type of the array object is anyType[ ] • Array declaration: anyType [ ] arrName; Trang 11Arrays as Objects ... for booleans, null for objects • If its elements are objects, the array holds references to objects, which are initially set to null • Each object-type element must be initialized before it is ... array object Trang 16Initializing Elements • Unless specific values are given in a {…} list, all the elements are initialized to the default value: 0 for numbers, false for booleans, null for objects

Ngày tải lên: 04/11/2020, 23:16

... reserved. Java Methods Object-Oriented Programming and Data Structures Maria Litvin ● Gary Litvin 2nd AP edition with GridWorld Trang 2Objectives: • Learn about the three ways to compare objects in Java ... Insertion Sort  Mergesort and Quicksort • Learn about the java.util.Arrays and java.util.Collections classes Trang 3Comparing Objects in Java • boolean result = obj1.equals(obj2); • int diff = ... that take a comparator object as a parameter Trang 14Ben 3Cal 2 Dan 0 Eve 6 Fay 1 Guy 4 Trang 15Sequential Search (cont’d) public int sequentialSearch(Object [ ] arr, Object value) { for (int

Ngày tải lên: 04/11/2020, 23:16

... Using only mouseReleased is usually a safe bet Called when the mouse cursor enters/exits component’s visible area Trang 5Mouse Events (cont’d) • Mouse listener methods receive a MouseEvent object ... class has a method getImage that returns an Image object Trang 15Images (cont’d) • In applications, it may be easier to work with Swing’s ImageIcon objects: (usually this) Trang 17The Drawing Editor ... 17The Drawing Editor Program Trang 18Drawing Editor (cont’d) • Allows to move and shape objects on “canvas” using the mouse and the cursor keys • Here the shapes are circles (“balloons”) • Uses

Ngày tải lên: 04/11/2020, 23:17