Lecture Static Methods and Variables. Static Methods
|
|
- Dale Blair
- 6 years ago
- Views:
Transcription
1 Lecture 15.1 Static Methods and Variables Static Methods In Java it is possible to declare methods and variables to belong to a class rather than an object. This is done by declaring them to be static. the declaration Static methods are declared by inserting the word static immediately after the scope specifier (public, private or protected). public class ArrayStuff { public static double mean(double[] arr) { double total = 0.0; for (int k=0; k!=arr.length; k++) { total = total + arr[k]; return total / arr.length; the call Static methods are called using the name of their class in place of an object reference. double[] myarray = {1.1, 2.2, 3.3;... double average = ArrayStuff.mean(myArray);
2 Static Methods - Why? Static methods are useful for methods that are disassociated from all objects, excepting their parameters. A good example of the utility of static method is found in the standard Java class, called Math. public class Math { public static double abs(double d) {... public static int abs(int k) {... public static double cos(double d) {... public static double pow(double b, double exp) {... public static double random() {... public static int round(float f) {... public static long round(double d) {... public static double sin(double d) {... public static double sqrt(double d) {... public static double tan(double d) { Static Method Restrictions Since a static method belongs to a class, not an object, there are limitations. The body of a static method cannot reference any non-static (instance) variable. The body of a static method cannot call any non-static method unless it is applied to some other instantiated object. However,... The body of a static method can instantiate objects. Example (the run.java file) public class run { public static void main(string[] args) { Driver driver = new Driver(); Note that Java applications are required to initiate execution from a static void method that is always named main and has a single String array as its parameter
3 Static Variables Any instance variable can be declared static by including the word static immediately before the type specification What s Different about a static variable? 1) A static variable can be referenced either using its class name or a reference to an object of that type. 2) Instantiating a second object of the same type does not increase the number of static variables. Example public class StaticStuff { public static double staticdouble; public static String staticstring;... StaticStuff s1, s2; s1 = new StaticStuff(); s2 = new StaticStuff(); s1.staticdouble = 3.7; System.out.println( s1.staticdouble ); System.out.println( s2.staticdouble ); s1.staticstring = abc ; s2.staticstring = xyz ; System.out.println( s1.staticstring ); System.out.println( s2.staticstring ); Static Variables - Why? Static variables are useful for situations where data needs to be shared across multiple objects of the same type. A good example of the utility of static variable is found in the standard Java class, called Color. public class Color { public static final Color black = new Color(0,0,0); public static final Color blue = new Color(0,0,255); public static final Color cyan = new Color(0,255,255); public static final Color darkgray = new Color(64,64,64);... Since they the Color constants are both static and final, they can be compared using ==. Color mycolor;... if (mycolor == Color.green)
4 Java Application An application is one type of Java Program. Every application begins executing with a main method. main must be static and void. main must have a single parameter of type String[]. Example (to start a Driver program) public class go { public static void main(string[] args) { Driver d = new Driver(); When the go class executes, it instantiates a local object by calling the Driver constructor method. Such an application can be executed by the following jdk command java go Java Application from BlueJ Java jar files are a kind of compressed double-clickable executable. To create a jar file from CS120 programs using BlueJ. write a static void main method in the Driver class from the BlueJ menu select Project -> Create Jar File Example (the Driver program) public class Driver { // all previous code stays here public static void main(string[] args) { Driver d = new Driver();
5 Java Applet An applet is the second type of Java Program. Applets are designed to be delivered to Internet Web browsers which means... An Applet has a built-in graphical window. An Applet has security restrictions (e.g., it cannot write to a local file). Initiating applet execution is different from initiating an application. Requirements 1) An begins with a class that inherits the Applet or JApplet class. import java.applet.applet; public class Example extends Applet {... 2) An HTML file is needed to invoke the applet. 3) The HTML file must be accessed either by a Web browser or by appletviewer (a jdk command). 4) Applets have certain methods with predefined purposes. These can be overridden. These methods include init(), start(), stop(), destroy(). (Parameterless constructor methods can also be used, but static void main cannot.) HTML HTML (HyperText Mark up Language) is a common notation for text files used on the Internet. HTML files incorporate the use of tags (like type-setting commands) <... > Example <html> <head> <title> runs the Example applet from the prior slide. </title> </head> <body> <applet code= Example.class width=100 height=50> </applet> </body> </html> program name (This class should be in the same directory as this HTML file.) These two optional parts of the tag specify the dimensions of the drawing window used by the applet
6 Applets from Driver The example programs (using the same Driver.java files) from The Object of Java can be executed as applets in the following way. 1) Include the following applet in the program directory. import javax.swing.japplet; public class AppletStarter extends JApplet { private Driver driver; public void start() { driver = new Driver(); 2) Include a copy of all.class files used by the program in the program folder. 3) Include the following HTML file, call it go.html in the program folder. <html> <body> <applet code= AppletStarter.class width=600 height=500> </applet> </body> </html> 4) Start the applet by opening the HTML file in a Web browser or with the following jdk command... appletviewer go.html
Lecture Static Methods and Variables. Static Methods
Lecture 15.1 Static Methods and Variables Static Methods In Java it is possible to declare methods and variables to belong to a class rather than an object. This is done by declaring them to be static.
More informationAn applet is a program written in the Java programming language that can be included in an HTML page, much in the same way an image is included in a
CBOP3203 An applet is a program written in the Java programming language that can be included in an HTML page, much in the same way an image is included in a page. When you use a Java technology-enabled
More informationClasses. Classes as Code Libraries. Classes as Data Structures
Classes Classes/Objects/Interfaces (Savitch, Various Chapters) TOPICS Classes Public versus Private Static Data Static Methods Interfaces Classes are the basis of object-oriented (OO) programming. They
More informationJava Applets. Last Time. Java Applets. Java Applets. First Java Applet. Java Applets. v We created our first Java application
Last Time v We created our first Java application v What are the components of a basic Java application? v What GUI component did we use in the examples? v How do we write to the standard output? v An
More informationClasses. Classes as Code Libraries. Classes as Data Structures. Classes/Objects/Interfaces (Savitch, Various Chapters)
Classes Classes/Objects/Interfaces (Savitch, Various Chapters) TOPICS Classes Public versus Private Static Data Static Methods Interfaces Classes are the basis of object-oriented (OO) programming. They
More informationCS110: PROGRAMMING LANGUAGE I
CS110: PROGRAMMING LANGUAGE I Computer Science Department Lecture 8: Methods Lecture Contents: 2 Introduction Program modules in java Defining Methods Calling Methods Scope of local variables Passing Parameters
More informationCS335 Graphics and Multimedia
CS335 Graphics and Multimedia Fuhua (Frank) Cheng Department of Computer Science University of Kentucky Lexington, KY 40506-0046 -2-1. Programming Using JAVA JAVA history: WHY JAVA? Simple Objected-oriented
More informationCSC System Development with Java Introduction to Java Applets Budditha Hettige
CSC 308 2.0 System Development with Java Introduction to Java Applets Budditha Hettige Department of Statistics and Computer Science What is an applet? applet: a Java program that can be inserted into
More informationCSC 1051 Algorithms and Data Structures I. Midterm Examination February 25, Name: KEY A
CSC 1051 Algorithms and Data Structures I Midterm Examination February 25, 2016 Name: KEY A Question Value Score 1 10 2 10 3 10 4 10 5 10 6 10 7 10 8 10 9 10 10 10 TOTAL 100 Please answer questions in
More informationPage 1 of 7. public class EmployeeAryAppletEx extends JApplet
CS 209 Spring, 2006 Lab 9: Applets Instructor: J.G. Neal Objectives: To gain experience with: 1. Programming Java applets and the HTML page within which an applet is embedded. 2. The passing of parameters
More informationCSC Algorithms and Data Structures I. Midterm Examination February 25, Name:
CSC 1051-001 Algorithms and Data Structures I Midterm Examination February 25, 2016 Name: Question Value Score 1 10 2 10 3 10 4 10 5 10 6 10 7 10 8 10 9 10 10 10 TOTAL 100 Please answer questions in the
More informationObject Oriented Programming
Object Oriented Programming 1. Class String 3. Operators, again 4. Control structures in Java 5. Classes and Objects OOP2 - M. Joldoş - T.U. Cluj 1 The Class String There is no primitive type for strings
More informationCSC 1051 Algorithms and Data Structures I. Midterm Examination March 2, Name:
CSC 1051 Algorithms and Data Structures I Midterm Examination March 2, 2017 Name: Question Value Score 1 10 2 10 3 20 4 20 5 20 6 20 TOTAL 100 Please answer questions in the spaces provided. If you make
More informationGUI, Events and Applets from Applications, Part III
GUI, Events and Applets from Applications, Part III Quick Start Compile step once always javac PropertyTax6.java mkdir labs cd labs Execute step mkdir 6 appletviewer PropertyTax6.htm cd 6 emacs PropertyTax6.htm
More informationSummary. 962 Chapter 23 Applets and Java Web Start
962 Chapter 23 Applets and Java Web Start Summary Section 23.1 Introduction Applets (p. 942) are Java programs that are typically embedded in HTML (Extensible Hyper- Text Markup Language) documents also
More informationChapter 7 Applets. Answers
Chapter 7 Applets Answers 1. D The drawoval(x, y, width, height) method of graphics draws an empty oval within a bounding box, and accepts 4 int parameters. The x and y coordinates of the left/top point
More informationCSC 1051 Algorithms and Data Structures I. Midterm Examination October 9, Name: KEY
CSC 1051 Algorithms and Data Structures I Midterm Examination October 9, 2014 Name: KEY Question Value Score 1 10 2 10 3 10 4 10 5 10 6 10 7 10 8 10 9 10 10 10 TOTAL 100 Please answer questions in the
More informationCT 229 Arrays in Java
CT 229 Arrays in Java 27/10/2006 CT229 Next Weeks Lecture Cancelled Lectures on Friday 3 rd of Nov Cancelled Lab and Tutorials go ahead as normal Lectures will resume on Friday the 10 th of Nov 27/10/2006
More informationCSC 1051 Algorithms and Data Structures I. Midterm Examination October 7, Name:
CSC 1051 Algorithms and Data Structures I Midterm Examination October 7, 2013 Name: Question Value Score 1 10 2 10 3 10 4 10 5 10 6 10 7 10 8 10 9 10 10 10 TOTAL 100 Please answer questions in the spaces
More informationChapter 5 Methods. Liang, Introduction to Java Programming, Eighth Edition, (c) 2011 Pearson Education, Inc. All rights reserved.
Chapter 5 Methods 1 Opening Problem Find the sum of integers from 1 to 10, from 20 to 30, and from 35 to 45, respectively. 2 Problem int sum = 0; for (int i = 1; i
More informationName CS/120 Sample Exam #1 -- Riley. a) Every program has syntax, which refers to the form of the code, and, which refers to the meaning of the code.
Name CS/120 Sample Exam #1 -- Riley Please show all of your work. 1. For each part below write the term, symbols, or phrase from class that best fits the description. (Each part is worth 2 points.) a)
More informationTo define methods, invoke methods, and pass arguments to a method ( ). To develop reusable code that is modular, easy-toread, easy-to-debug,
1 To define methods, invoke methods, and pass arguments to a method ( 5.2-5.5). To develop reusable code that is modular, easy-toread, easy-to-debug, and easy-to-maintain. ( 5.6). To use method overloading
More informationCS 209 Programming in Java #12 JAR Files: Creation and Use
CS 209 Programming in Java #12 JAR Files: Creation and Use Textbook Chapter 14 Spring, 2006 Instructor: J.G. Neal 1 Topics Introduction to JAR Files Using the JAR Tool for an Applet Deploying an Applet
More informationChapter 5 Methods / Functions
Chapter 5 Methods / Functions 1 Motivations A method is a construct for grouping statements together to perform a function. Using a method, you can write the code once for performing the function in a
More informationCSC 1051 Data Structures and Algorithms I. Dr. Mary-Angela Papalaskari Department of Computing Sciences Villanova University
Graphics & Applets CSC 1051 Data Structures and Algorithms I Dr. Mary-Angela Papalaskari Department of Computing Sciences Villanova University Course website: www.csc.villanova.edu/~map/1051/ Back to Chapter
More informationProgramming by Delegation
Chapter 2 a Programming by Delegation I. Scott MacKenzie a These slides are mostly based on the course text: Java by abstraction: A client-view approach (4 th edition), H. Roumani (2015). 1 Topics What
More informationCSCI 053. Week 5 Java is like Alice not based on Joel Adams you may want to take notes. Rhys Price Jones. Introduction to Software Development
CSCI 053 Introduction to Software Development Rhys Price Jones Week 5 Java is like Alice not based on Joel Adams you may want to take notes Objectives Learn to use the Eclipse IDE Integrated Development
More informationChapter 3 - Introduction to Java Applets
1 Chapter 3 - Introduction to Java Applets 2 Introduction Applet Program that runs in appletviewer (test utility for applets) Web browser (IE, Communicator) Executes when HTML (Hypertext Markup Language)
More informationProgramming: You will have 6 files all need to be located in the dir. named PA4:
PROGRAMMING ASSIGNMENT 4: Read Savitch: Chapter 7 and class notes Programming: You will have 6 files all need to be located in the dir. named PA4: PA4.java ShapeP4.java PointP4.java CircleP4.java RectangleP4.java
More informationINTRODUCTION TO COMPUTER PROGRAMMING. Richard Pierse. Class 9: Writing Java Applets. Introduction
INTRODUCTION TO COMPUTER PROGRAMMING Richard Pierse Class 9: Writing Java Applets Introduction Applets are Java programs that execute within HTML pages. There are three stages to creating a working Java
More informationAdvanced Internet Programming CSY3020
Advanced Internet Programming CSY3020 Java Applets The three Java Applet examples produce a very rudimentary drawing applet. An Applet is compiled Java which is normally run within a browser. Java applets
More informationClass 9: Static Methods and Data Members
Introduction to Computation and Problem Solving Class 9: Static Methods and Data Members Prof. Steven R. Lerman and Dr. V. Judson Harward Goals This the session in which we explain what static means. You
More informationModule 5 Applets About Applets Hierarchy of Applet Life Cycle of an Applet
About Applets Module 5 Applets An applet is a little application. Prior to the World Wide Web, the built-in writing and drawing programs that came with Windows were sometimes called "applets." On the Web,
More informationJava Applet & its life Cycle. By Iqtidar Ali
Java Applet & its life Cycle By Iqtidar Ali Java Applet Basic An applet is a java program that runs in a Web browser. An applet can be said as a fully functional java application. When browsing the Web,
More informationG51PRG: Introduction to Programming Second semester Applets and graphics
G51PRG: Introduction to Programming Second semester Applets and graphics Natasha Alechina School of Computer Science & IT nza@cs.nott.ac.uk Previous two lectures AWT and Swing Creating components and putting
More informationCSC 1051 Algorithms and Data Structures I. Midterm Examination February 26, Name: Key
CSC 1051 Algorithms and Data Structures I Midterm Examination February 26, 2015 Name: Key Question Value 1 10 Score 2 10 3 10 4 10 5 10 6 10 7 10 8 10 9 10 10 10 TOTAL 100 Please answer questions in the
More informationPROGRAMMING LANGUAGE 2
1 PROGRAMMING LANGUAGE 2 Lecture 13. Java Applets Outline 2 Applet Fundamentals Applet class Applet Fundamentals 3 Applets are small applications that are accessed on an Internet server, transported over
More informationMethods and Data (Savitch, Chapter 5)
Methods and Data (Savitch, Chapter 5) TOPICS Invoking Methods Return Values Local Variables Method Parameters Public versus Private 2 public class Temperature { public static void main(string[] args) {
More informationLecture 5: Methods CS2301
Lecture 5: Methods NADA ALZAHRANI CS2301 1 Opening Problem Find the sum of integers from 1 to 10, from 20 to 30, and from 35 to 45, respectively. 2 Solution public static int sum(int i1, int i2) { int
More informationObject-Oriented Concepts
JAC444 - Lecture 3 Object-Oriented Concepts Segment 2 Inheritance 1 Classes Segment 2 Inheritance In this segment you will be learning about: Inheritance Overriding Final Methods and Classes Implementing
More informationClasses and Objects 3/28/2017. How can multiple methods within a Java class read and write the same variable?
Peer Instruction 8 Classes and Objects How can multiple methods within a Java class read and write the same variable? A. Allow one method to reference a local variable of the other B. Declare a variable
More informationCSC 1051 Algorithms and Data Structures I. Midterm Examination October 6, Name:
CSC 1051 Algorithms and Data Structures I Midterm Examination October 6, 2016 Name: Question Value Score 1 20 2 20 3 20 4 20 5 20 TOTAL 100 Please answer questions in the spaces provided. If you make a
More informationIntroduction to Computer Science I
Introduction to Computer Science I Graphics Janyl Jumadinova 7 February, 2018 Graphics Graphics can be simple or complex, but they are just data like a text document or sound. Java is pretty good at graphics,
More informationChapter 5 Methods. Liang, Introduction to Java Programming, Eighth Edition, (c) 2011 Pearson Education, Inc. All rights reserved.
Chapter 5 Methods rights reserved. 0132130807 1 Opening Problem Find the sum of integers from 1 to 10, from 20 to 30, and from 35 to 45, respectively. rights reserved. 0132130807 2 1 Problem int sum =
More informationDUBLIN CITY UNIVERSITY
DUBLIN CITY UNIVERSITY REPEAT EXAMINATIONS 2008 MODULE: Object-oriented Programming I - EE219 COURSE: B.Eng. in Electronic Engineering (Year 2 & 3) B.Eng. in Information Telecomms Engineering (Year 2 &
More informationDUBLIN CITY UNIVERSITY
DUBLIN CITY UNIVERSITY SEMESTER ONE EXAMINATIONS 2007 MODULE: Object Oriented Programming I - EE219 COURSE: B.Eng. in Electronic Engineering B.Eng. in Information Telecommunications Engineering B.Eng.
More informationProgramming graphics
Programming graphics Need a window javax.swing.jframe Several essential steps to use (necessary plumbing ): Set the size width and height in pixels Set a title (optional), and a close operation Make it
More informationFramework. Set of cooperating classes/interfaces. Example: Swing package is framework for problem domain of GUI programming
Frameworks 1 Framework Set of cooperating classes/interfaces Structure essential mechanisms of a problem domain Programmer can extend framework classes, creating new functionality Example: Swing package
More informationJava Applet Basics. Life cycle of an applet:
Java Applet Basics Applet is a Java program that can be embedded into a web page. It runs inside the web browser and works at client side. Applet is embedded in a HTML page using the APPLET or OBJECT tag
More informationRoad Map. Introduction to Java Applets Review applets that ship with JDK Make our own simple applets
Java Applets Road Map Introduction to Java Applets Review applets that ship with JDK Make our own simple applets Introduce inheritance Introduce the applet environment html needed for applets Reading:
More informationGoals. Java - An Introduction. Java is Compiled and Interpreted. Architecture Neutral & Portable. Compiled Languages. Introduction to Java
Goals Understand the basics of Java. Introduction to Java Write simple Java Programs. 1 2 Java - An Introduction Java is Compiled and Interpreted Java - The programming language from Sun Microsystems Programmer
More informationObject Orientation Fourth Story. Bok, Jong Soon
Object Orientation Fourth Story Bok, Jong Soon javaexpert@nate.com www.javaexpert.co.kr abstract Methods Java allows you to specify that a superclass declares a method that does not supply an implementation.
More informationChapter 5 Methods. Lecture notes for computer programming 1 Faculty of Engineering and Information Technology Prepared by: Iyad Albayouk
Chapter 5 Methods Lecture notes for computer programming 1 Faculty of Engineering and Information Technology Prepared by: Iyad Albayouk ١ Introducing Methods A method is a collection of statements that
More informationCS1004: Intro to CS in Java, Spring 2005
CS4: Intro to CS in Java, Spring 25 Lecture #8: GUIs, logic design Janak J Parekh janak@cs.columbia.edu Administrivia HW#2 out New TAs, changed office hours How to create an Applet Your class must extend
More informationChapter 6 Methods. Dr. Hikmat Jaber
Chapter 6 Methods Dr. Hikmat Jaber 1 Opening Problem Find the sum of integers from 1 to 10, from 20 to 30, and from 35 to 45, respectively. 2 Problem int sum = 0; for (int i = 1; i
More informationINDEX. A SIMPLE JAVA PROGRAM Class Declaration The Main Line. The Line Contains Three Keywords The Output Line
A SIMPLE JAVA PROGRAM Class Declaration The Main Line INDEX The Line Contains Three Keywords The Output Line COMMENTS Single Line Comment Multiline Comment Documentation Comment TYPE CASTING Implicit Type
More informationCh 7 Designing Java Classes & Class structure
Ch 7 Designing Java Classes & Class structure Classes comprise fields and methods Fields: Things that describe the class or describe instances (i.e. objects) e.g. student number, first name, last name,
More informationCS506 Web Design & Development Final Term Solved MCQs with Reference
with Reference I am student in MCS (Virtual University of Pakistan). All the MCQs are solved by me. I followed the Moaaz pattern in Writing and Layout this document. Because many students are familiar
More informationMethods. Methods. Mysteries Revealed
Methods Methods and Data (Savitch, Chapter 5) TOPICS Invoking Methods Return Values Local Variables Method Parameters Public versus Private A method (a.k.a. func2on, procedure, rou2ne) is a piece of code
More informationFundamentals of Object Oriented Programming
INDIAN INSTITUTE OF TECHNOLOGY ROORKEE Fundamentals of Object Oriented Programming CSN- 103 Dr. R. Balasubramanian Associate Professor Department of Computer Science and Engineering Indian Institute of
More informationCSCE3193: Programming Paradigms
CSCE3193: Programming Paradigms Nilanjan Banerjee University of Arkansas Fayetteville, AR nilanb@uark.edu http://www.csce.uark.edu/~nilanb/3193/s10/ Programming Paradigms 1 Java Packages Application programmer
More informationCmSc 150 Fundamentals of Computing I. Lesson 28: Introduction to Classes and Objects in Java. 1. Classes and Objects
CmSc 150 Fundamentals of Computing I Lesson 28: Introduction to Classes and Objects in Java 1. Classes and Objects True object-oriented programming is based on defining classes that represent objects with
More informationChapter 12 Advanced GUIs and Graphics
Chapter 12 Advanced GUIs and Graphics Chapter Objectives Learn about applets Explore the class Graphics Learn about the classfont Explore the classcolor Java Programming: From Problem Analysis to Program
More informationJava Memory Management
Java Memory Management Memory Allocation in Java When a program is being executed, separate areas of memory are allocated for each code (classes and interfaces) objects running methods 1-2 Memory Areas
More informationenum Types 1 1 The keyword enum is a shorthand for enumeration. Zheng-Liang Lu Java Programming 267 / 287
enum Types 1 An enum type is an reference type limited to an explicit set of values. An order among these values is defined by their order of declaration. There exists a correspondence with string names
More informationCS/ENGRD 2110 SPRING Lecture 2: Objects and classes in Java
1 CS/ENGRD 2110 SPRING 2014 Lecture 2: Objects and classes in Java http://courses.cs.cornell.edu/cs2110 Java OO (Object Orientation) 2 Python and Matlab have objects and classes. Strong-typing nature of
More informationJava and OOP. Part 3 Extending classes. OOP in Java : W. Milner 2005 : Slide 1
Java and OOP Part 3 Extending classes OOP in Java : W. Milner 2005 : Slide 1 Inheritance Suppose we want a version of an existing class, which is slightly different from it. We want to avoid starting again
More informationJAVA: A Primer. By: Amrita Rajagopal
JAVA: A Primer By: Amrita Rajagopal 1 Some facts about JAVA JAVA is an Object Oriented Programming language (OOP) Everything in Java is an object application-- a Java program that executes independently
More informationHTML Links Tutorials http://www.htmlcodetutorial.com/ http://www.w3.org/markup/guide/ Quick Reference http://werbach.com/barebones/barebones.html Applets A Java application is a stand-alone program with
More informationYou should now start on Chapter 4. Chapter 4 introduces the following concepts
Summary By this stage, you have met the following principles : the relationship between classes and objects that a class represents our understanding of something weʼre interested in, in a special and
More informationBuilding Java Programs
Building Java Programs Graphics reading: Supplement 3G videos: Ch. 3G #1-2 Objects (briefly) object: An entity that contains data and behavior. data: variables inside the object behavior: methods inside
More informationCS 116 Week 8 Page 1
CS 116 Week 8: Outline Reading: 1. Dale, Chapter 11 2. Dale, Lab 11 Objectives: 1. Mid-term exam CS 116 Week 8 Page 1 CS 116 Week 8: Lecture Outline 1. Mid-term Exam CS 116 Week 8 Page 2 CS 116 Week 8:
More informationChapter 4: Writing Classes
Chapter 4: Writing Classes Java Software Solutions Foundations of Program Design Sixth Edition by Lewis & Loftus Writing Classes We've been using predefined classes. Now we will learn to write our own
More informationInheritance. Inheritance Reserved word protected Reserved word super Overriding methods Class Hierarchies Reading for this lecture: L&L
Inheritance Inheritance Reserved word protected Reserved word super Overriding methods Class Hierarchies Reading for this lecture: L&L 9.1 9.4 1 Inheritance Inheritance allows a software developer to derive
More informationContents 8-1. Copyright (c) N. Afshartous
Contents 1. Classes and Objects 2. Inheritance 3. Interfaces 4. Exceptions and Error Handling 5. Intro to Concurrency 6. Concurrency in Java 7. Graphics and Animation 8. Applets 8-1 Chapter 8: Applets
More informationChapter 4 Java Language Fundamentals
Chapter 4 Java Language Fundamentals Develop code that declares classes, interfaces, and enums, and includes the appropriate use of package and import statements Explain the effect of modifiers Given an
More informationThe life and death of objects, sta2cs. CSCI 136: Fundamentals of Computer Science II Keith Vertanen
The life and death of objects, sta2cs CSCI 136: Fundamentals of Computer Science II Keith Vertanen Overview Where Java stores stuff The Heap The Stack Breaking both Java Garbage Collector (GC) CreaAng
More informationShared Collection of Java Course Materials: New Topics Covered. Agenda
Shared Collection of Java Course Materials: New Topics Covered Dragoslav Pešovi ović DAAD project Joint Course on OOP using Java Humboldt University Berlin, University of Novi Sad, Polytehnica University
More informationDo this by creating on the m: drive (Accessed via start menu link Computer [The m: drive has your login id as name]) the subdirectory CI101.
Creating and running a Java program. This tutorial is an introduction to running a computer program written in the computer programming language Java using the BlueJ IDE (Integrated Development Environment).
More informationASSIGNMENT NO 14. Objectives: To learn and demonstrated use of applet and swing components
Create an applet with three text Fields and four buttons add, subtract, multiply and divide. User will enter two values in the Text Fields. When any button is pressed, the corresponding operation is performed
More informationCS/B.TECH/CSE(New)/SEM-5/CS-504D/ OBJECT ORIENTED PROGRAMMING. Time Allotted : 3 Hours Full Marks : 70 GROUP A. (Multiple Choice Type Question)
CS/B.TECH/CSE(New)/SEM-5/CS-504D/2013-14 2013 OBJECT ORIENTED PROGRAMMING Time Allotted : 3 Hours Full Marks : 70 The figures in the margin indicate full marks. Candidates are required to give their answers
More informationCommand-Line Applications. GUI Libraries GUI-related classes are defined primarily in the java.awt and the javax.swing packages.
1 CS257 Computer Science I Kevin Sahr, PhD Lecture 14: Graphical User Interfaces Command-Line Applications 2 The programs we've explored thus far have been text-based applications A Java application is
More informationJava 1.8 Programming
One Introduction to Java 2 Usage of Java 3 Structure of Java 4 Flexibility of Java Programming 5 Two Running Java in Dos 6 Using the DOS Window 7 DOS Operating System Commands 8 Compiling and Executing
More informationCS 302 Week 9. Jim Williams
CS 302 Week 9 Jim Williams This Week P2 Milestone 3 Lab: Instantiating Classes Lecture: Wrapper Classes More Objects (Instances) and Classes Next Week: Spring Break Will this work? Double d = new Double(10);
More informationMethods (Deitel chapter 6)
Methods (Deitel chapter 6) 1 Plan 2 Introduction Program Modules in Java Math-Class Methods Method Declarations Argument Promotion Java API Packages Random-Number Generation Scope of Declarations Methods
More informationOverview. Applets. A Java GUI inside your browser! Important methods Drawing images Playing audio Getting input parameters Double buffering
Java Applets don't panic about frogs!
More informationCSD Univ. of Crete Fall Java Applets
Java Applets 1 Applets An applet is a Panel that allows interaction with a Java program Typically embedded in a Web page and can be run from a browser You need special HTML in the Web page to tell the
More informationComputer Science II (20082) Week 1: Review and Inheritance
Computer Science II 4003-232-08 (20082) Week 1: Review and Inheritance Richard Zanibbi Rochester Institute of Technology Review of CS-I Syntax and Semantics of Formal (e.g. Programming) Languages Syntax
More informationMethods (Deitel chapter 6)
1 Plan 2 Methods (Deitel chapter ) Introduction Program Modules in Java Math-Class Methods Method Declarations Argument Promotion Java API Packages Random-Number Generation Scope of Declarations Methods
More informationCS/ENGRD 2110 FALL Lecture 2: Objects and classes in Java
1 CS/ENGRD 2110 FALL 2017 Lecture 2: Objects and classes in Java http://courses.cs.cornell.edu/cs2110 CMS VideoNote.com, PPT slides, DrJava 2 CMS. Visit course webpage, click Links, then CMS for 2110.
More informationCS Internet programming Unit- I Part - A 1 Define Java. 2. What is a Class? 3. What is an Object? 4. What is an Instance?
CS6501 - Internet programming Unit- I Part - A 1 Define Java. Java is a programming language expressly designed for use in the distributed environment of the Internet. It was designed to have the "look
More informationIntroduction to Java
Introduction to Java Module 1: Getting started, Java Basics 22/01/2010 Prepared by Chris Panayiotou for EPL 233 1 Lab Objectives o Objective: Learn how to write, compile and execute HelloWorld.java Learn
More informationChapter 5 Methods. Liang, Introduction to Java Programming, Ninth Edition, (c) 2013 Pearson Education, Inc. All rights reserved.
Chapter 5 Methods 1 Opening Problem Find the sum of integers from 1 to 10, from 20 to 30, and from 35 to 45, respectively. 2 Problem int sum = 0; for (int i = 1; i
More informationChapter 2 Using Objects. Types. Number Literals. A type defines a set of values and the operations that can be carried out on the values Examples:
Chapter 2 Using Objects Chapter Goals To learn about variables To understand the concepts of classes and objects To be able to call methods To learn about parameters and return values To be able to browse
More informationEE219 Object Oriented Programming I (2005/2006) SEMESTER 1 SOLUTIONS
Q1(a) Corrected code is: EE219 Object Oriented Programming I (2005/2006) SEMESTER 1 SOLUTIONS 01 #include 02 using namespace std; 03 04 class Question1 05 06 int a,b,*p; 07 08 public: 09 Question1(int
More informationProgrammierpraktikum
Programmierpraktikum Claudius Gros, SS2012 Institut für theoretische Physik Goethe-University Frankfurt a.m. 1 of 22 10/25/2012 09:08 AM Java - Basic Data Types 2 of 22 10/25/2012 09:08 AM primitive data
More informationArray. Lecture 12. Based on Slides of Dr. Norazah Yusof
Array Lecture 12 Based on Slides of Dr. Norazah Yusof 1 Introducing Arrays Array is a data structure that represents a collection of the same types of data. In Java, array is an object that can store a
More informationLecture 02, Fall 2018 Friday September 7
Anatomy of a class Oliver W. Layton CS231: Data Structures and Algorithms Lecture 02, Fall 2018 Friday September 7 Follow-up Python is also cross-platform. What s the advantage of Java? It s true: Python
More informationPrimitive Data Types: Intro
Primitive Data Types: Intro Primitive data types represent single values and are built into a language Java primitive numeric data types: 1. Integral types (a) byte (b) int (c) short (d) long 2. Real types
More informationS.E. Sem. III [CMPN] Object Oriented Programming Methodology
S.E. Sem. III [CMPN] Object Oriented Programming Methodology Time : 3 Hrs.] Prelim Question Paper Solution [Marks : 80 Q.1(a) Write a program to calculate GCD of two numbers in java. [5] (A) import java.util.*;
More information