Chap. 3. Creating Objects The String class Java Class Library (Packages) Math.random() Reading for this Lecture: L&L,

Size: px
Start display at page:

Download "Chap. 3. Creating Objects The String class Java Class Library (Packages) Math.random() Reading for this Lecture: L&L,"

Transcription

1 Chap. 3 Creating Objects The String class Java Class Library (Packages) Math.random() Reading for this Lecture: L&L,

2 From last time: Account Declaring an Account object: Account acct1 = new Account ("Ted Murphy", 72354, ); Now acct1 is a usable object reference variable. Compare to: Scanner scan = new Scanner(System.in); acct1 Ted Murphy, 72354, Object ref Object itself Using Account methods: use dot on object ref variable acct1.deposit (25.85); // changes balance in object acct1.addinterest(); Here we are calling methods of Account, namely deposit and addinterest 2

3 From last time: Account Account acct1 = new Account ("Ted Murphy", 72354, ); Now acct1 is a usable object reference variable. Picture: blue areas depict memory areas acct1 Ted Murphy, 72354, Variable Name: acct1, value: pointer to object Note how the object content is in a different memory area Compare to int variable: An int variable is self-contained in one memory area int height = 60; height 60 Variable Name: height, value: 60 3

4 Sec. 3.2 The String class We can create a String object using its constructor, listed on pg. 119: String greeting = new String( Hi! How are you ); But we usually use the more convenient form allowed by Java String greeting = Hi! How are you? ; Either way, we end up the a String object with contents Hi!, and an object reference named greeting greeting Hi! How are you? 4

5 Sec. 3.2 The String class greeting Hi! How are you? Now that we have an object variable (AKA reference), we can call String methods: int len = greeting.length(); // length method if (greeting.equals( Hello )) // equals method System.out.println(greeting.toUpperCase()); The last prints HI! HOW ARE YOU? 5

6 Class Libraries A class library is a collection of classes that we can use when developing programs The Java standard class library is part of any Java development environment Its classes are not part of the Java language per se, but we rely on them heavily Various classes we've already used (System, Scanner, String) are part of the Java standard class library (Look them up on Sun website) Other class libraries can be obtained through third party vendors, or you can create them yourself 6

7 Packages The classes of the Java standard class library are organized into packages Some packages in the standard class library are: Package java.lang java.applet java.awt javax.swing java.net java.util javax.xml.parsers Purpose General support Creating applets for the web Graphics and graphical user interfaces Additional graphics capabilities Network communication Utilities XML document processing 7

8 The import Declaration When you want to use a class contained in a package, you can use its fully qualified name java.util.scanner scan =... Or you can import the package containing the class and just use the class name Scanner import java.util.scanner; Scanner scan =... To import all classes in a particular package, you can use the * wildcard character import java.util.*; 8

9 The import Declaration All classes of the java.lang package are imported automatically into all programs It's as if all programs contain the following line: import java.lang.*; That's why we didn't have to import the System or String classes explicitly in earlier programs The Scanner class, on the other hand, is part of the java.util package, so that class must be imported as part of its package 9

10 The Random Number Generator Math.random() Needed for project 2, throwing dice Computer-generated truly random numbers are impossible We can call them pseudorandom numbers But they are such good fakes they can be used with confidence 10

11 Tiny Math.random() Example public class Random1 { public static void main (String[] args) { double num1 = Math.random(); // one random no. (< 1.0 double num2 = Math.random(); // another one System.out.println ("Random nos: " + num1 +" " + num2); } } Note: random() is a static method of the Math class So we use <classname>.<methodname> to call it. 11

12 Some generated numbers > run Random1 Random nos: > run Random1 Random nos: > run Random1 Random nos: We can turn these into ints using a little arithmetic 12

13 Math.random(): Random ints public class Random2 { public static void main (String[] args) { // Using *20, then convert to int // to generate random ints 0-19 int num1 = (int)(math.random()*20);// one random no. int num2 = (int)(math.random()*20);// another one System.out.println ("Random ints: " + num1 + " " + num2); } } 13

14 Random2 results: random ints 0-19 > run Random2 Random ints: 8 12 > run Random2 Random ints: > run Random2 Random ints: 0 8 Throwing dice: 6 possibilities so use (int)math.random()*6) for 6 outcomes 0, 1, 2, 3, 4, 5 Add one to shift to 1, 2, 3, 4, 5, 6 14

15 Formatting Output: Sec 3.6 Look at NumberFormat and DecimalFormat classes in the text They provide you with ways to output numbers with a predefined precision For example: Printing double value of Pi Printing only 2 decimal digits

Packages & Random and Math Classes

Packages & Random and Math Classes Packages & Random and Math Classes Quick review of last lecture September 6, 2006 ComS 207: Programming I (in Java) Iowa State University, FALL 2006 Instructor: Alexander Stoytchev Objects Classes An object

More information

ECE 122. Engineering Problem Solving with Java

ECE 122. Engineering Problem Solving with Java ECE 122 Engineering Problem Solving with Java Lecture 4 Creating and Using Objects Outline Problem: How do I create multiple objects from a class Java provides a number of built-in classes for us Understanding

More information

ECE 122. Engineering Problem Solving with Java

ECE 122. Engineering Problem Solving with Java ECE 122 Engineering Problem Solving with Java Lecture 4 Creating and Using Objects Outline Problem: How do I create multiple objects from a class Java provides a number of built-in classes for us Understanding

More information

Using Classes and Objects. Chapter

Using Classes and Objects. Chapter Using Classes and Objects 3 Chapter 5 TH EDITION Lewis & Loftus java Software Solutions Foundations of Program Design 2007 Pearson Addison-Wesley. All rights reserved Using Classes and Objects To create

More information

Formatting Output & Enumerated Types & Wrapper Classes

Formatting Output & Enumerated Types & Wrapper Classes Formatting Output & Enumerated Types & Wrapper Classes Quick review of last lecture September 8, 2006 ComS 207: Programming I (in Java) Iowa State University, FALL 2006 Instructor: Alexander Stoytchev

More information

Using Classes and Objects

Using Classes and Objects Using Classes and Objects 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/ Today

More information

We now start exploring some key elements of the Java programming language and ways of performing I/O

We now start exploring some key elements of the Java programming language and ways of performing I/O We now start exploring some key elements of the Java programming language and ways of performing I/O This week we focus on: Introduction to objects The String class String concatenation Creating objects

More information

Objectives of CS 230. Java portability. Why ADTs? 8/18/14

Objectives of CS 230. Java portability. Why ADTs?  8/18/14 http://cs.wellesley.edu/~cs230 Objectives of CS 230 Teach main ideas of programming Data abstraction Modularity Performance analysis Basic abstract data types (ADTs) Make you a more competent programmer

More information

COMP 202. Built in Libraries and objects. CONTENTS: Introduction to objects Introduction to some basic Java libraries string

COMP 202. Built in Libraries and objects. CONTENTS: Introduction to objects Introduction to some basic Java libraries string COMP 202 Built in Libraries and objects CONTENTS: Introduction to objects Introduction to some basic Java libraries string COMP 202 Objects and Built in Libraries 1 Classes and Objects An object is an

More information

A variable is a name for a location in memory A variable must be declared

A variable is a name for a location in memory A variable must be declared Variables A variable is a name for a location in memory A variable must be declared, specifying the variable's name and the type of information that will be held in it data type variable name int total;

More information

CSCI 2010 Principles of Computer Science. Basic Java Programming. 08/09/2013 CSCI Basic Java 1

CSCI 2010 Principles of Computer Science. Basic Java Programming. 08/09/2013 CSCI Basic Java 1 CSCI 2010 Principles of Computer Science Basic Java Programming 1 Today s Topics Using Classes and Objects object creation and object references the String class and its methods the Java standard class

More information

Java Basic Introduction, Classes and Objects SEEM

Java Basic Introduction, Classes and Objects SEEM Java Basic Introduction, Classes and Objects SEEM 3460 1 Java A programming language specifies the words and symbols that we can use to write a program A programming language employs a set of rules that

More information

Java Basic Introduction, Classes and Objects SEEM

Java Basic Introduction, Classes and Objects SEEM Java Basic Introduction, Classes and Objects SEEM 3460 1 Java A programming language specifies the words and symbols that we can use to write a program A programming language employs a set of rules that

More information

Chapter. We've been using predefined classes. Now we will learn to write our own classes to define objects

Chapter. We've been using predefined classes. Now we will learn to write our own classes to define objects Writing Classes 4 Chapter 5 TH EDITION Lewis & Loftus java Software Solutions Foundations of Program Design 2007 Pearson Addison-Wesley. All rights reserved Writing Classes We've been using predefined

More information

Anatomy of a Class Encapsulation Anatomy of a Method

Anatomy of a Class Encapsulation Anatomy of a Method Writing Classes Writing Classes We've been using predefined classes. Now we will learn to write our own classes to define objects Chapter 4 focuses on: class definitions instance data encapsulation and

More information

CSC 1051 Data Structures and Algorithms I. Dr. Mary-Angela Papalaskari Department of Computing Sciences Villanova University

CSC 1051 Data Structures and Algorithms I. Dr. Mary-Angela Papalaskari Department of Computing Sciences Villanova University Designing Classes 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/ Where do objects

More information

Using Classes and Objects

Using Classes and Objects Using Classes and Objects 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/ The

More information

Where do objects come from? Good question!

Where do objects come from? Good question! Designing Classes 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/ Where do objects

More information

CSC 1051 Data Structures and Algorithms I. Dr. Mary-Angela Papalaskari Department of Computing Sciences Villanova University

CSC 1051 Data Structures and Algorithms I. Dr. Mary-Angela Papalaskari Department of Computing Sciences Villanova University Designing Classes 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/ Where do objects

More information

Learning objectives: Objects and Primitive Data. Introduction to Objects. A Predefined Object. The print versus the println Methods

Learning objectives: Objects and Primitive Data. Introduction to Objects. A Predefined Object. The print versus the println Methods CSI1102 Introduction to Software Design Chapter 2: Objects and Primitive Data Learning objectives: Objects and Primitive Data Introducing objects and their properties Predefined objects: System.out Variables

More information

Code Listing H-1. (Car.java) H-2 Appendix H Packages

Code Listing H-1. (Car.java) H-2 Appendix H Packages APPENDIX H Packages NOTE: To use this appendix you must understand how your operating system uses directories, or folders. In addition, you must know how to set the value of an environment variable. The

More information

Using Classes and Objects

Using Classes and Objects Using Classes and Objects The Java class library or Java API (Application Programming Interface) CSC 1051 Data Structures and Algorithms I Dr. Mary-Angela Papalaskari Department of Computing Sciences Villanova

More information

Classes and Objects Part 1

Classes and Objects Part 1 COMP-202 Classes and Objects Part 1 Lecture Outline Object Identity, State, Behaviour Class Libraries Import Statement, Packages Object Interface and Implementation Object Life Cycle Creation, Destruction

More information

Designing Classes part 2

Designing Classes part 2 Designing Classes part 2 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/ Getting

More information

Designing Classes. Where do objects come from? Where do objects come from? Example: Account datatype. Dr. Papalaskari 1

Designing Classes. Where do objects come from? Where do objects come from? Example: Account datatype. Dr. Papalaskari 1 Designing Classes Where do objects come from? 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/

More information

Java Libraries. Lecture 6 CGS 3416 Fall September 21, 2015

Java Libraries. Lecture 6 CGS 3416 Fall September 21, 2015 Java Libraries Lecture 6 CGS 3416 Fall 2015 September 21, 2015 Intro to Libraries We ve barely scratched the surface of Java, but before we proceed with programming concepts, we need to talk about the

More information

Object Oriented Programming. Java-Lecture 1

Object Oriented Programming. Java-Lecture 1 Object Oriented Programming Java-Lecture 1 Standard output System.out is known as the standard output object Methods to display text onto the standard output System.out.print prints text onto the screen

More information

CS 112 Introduction to Programming

CS 112 Introduction to Programming CS 112 Introduction to Programming Summary of Methods; User Input using Scanner Yang (Richard) Yang Computer Science Department Yale University 308A Watson, Phone: 432-6400 Email: yry@cs.yale.edu Admin

More information

class declaration Designing Classes part 2 Getting to know classes so far Review Next: 3/18/13 Driver classes:

class declaration Designing Classes part 2 Getting to know classes so far Review Next: 3/18/13 Driver classes: Designing Classes part 2 CSC 1051 Data Structures and Algorithms I Getting to know classes so far Predefined classes from the Java API. Defining classes of our own: Driver classes: Account Transactions

More information

CSE1720 Delegation Concepts (Ch 2)

CSE1720 Delegation Concepts (Ch 2) CSE1720 Delegation Concepts (Ch 2) Output (sec 2.2.5) Output to the console Output to a file (later section 5.3.2) Instead of System.out.println( Hi ); Use: output.println( Hi ); 1 2 Ready-Made I/O Components

More information

CS 211: Existing Classes in the Java Library

CS 211: Existing Classes in the Java Library CS 211: Existing Classes in the Java Library Chris Kauffman Week 3-2 Logisitics Logistics P1 Due tonight: Questions? Late policy? Lab 3 Exercises Thu/Fri Play with Scanner Introduce it today Goals Class

More information

Designing Classes. Where do objects come from? Where do objects come from? Example: Account datatype. Dr. Papalaskari 1

Designing Classes. Where do objects come from? Where do objects come from? Example: Account datatype. Dr. Papalaskari 1 Designing Classes Where do objects come from? 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/

More information

CS 335 Lecture 02 Java Programming

CS 335 Lecture 02 Java Programming 1 CS 335 Lecture 02 Java Programming Programming in Java Define data Calculate using data Output result Java is object-oriented: Java program must: Merge data and functions into object Invoke functions

More information

Objects and Classes -- Introduction

Objects and Classes -- Introduction Objects and Classes -- Introduction Now that some low-level programming concepts have been established, we can examine objects in more detail Chapter 4 focuses on: the concept of objects the use of classes

More information

Encapsulation. Administrative Stuff. September 12, Writing Classes. Quick review of last lecture. Classes. Classes and Objects

Encapsulation. Administrative Stuff. September 12, Writing Classes. Quick review of last lecture. Classes. Classes and Objects Administrative Stuff September 12, 2007 HW3 is due on Friday No new HW will be out this week Next Tuesday we will have Midterm 1: Sep 18 @ 6:30 7:45pm. Location: Curtiss Hall 127 (classroom) On Monday

More information

CSC 1051 Data Structures and Algorithms I. Dr. Mary-Angela Papalaskari Department of Computing Sciences Villanova University

CSC 1051 Data Structures and Algorithms I. Dr. Mary-Angela Papalaskari Department of Computing Sciences Villanova University Last Class 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/ Some slides in this

More information

AP Computer Science Unit 1. Writing Programs Using BlueJ

AP Computer Science Unit 1. Writing Programs Using BlueJ AP Computer Science Unit 1. Writing Programs Using BlueJ 1. Open up BlueJ. Click on the Project menu and select New Project. You should see the window on the right. Navigate to wherever you plan to save

More information

AP Computer Science Unit 1. Writing Programs Using BlueJ

AP Computer Science Unit 1. Writing Programs Using BlueJ AP Computer Science Unit 1. Writing Programs Using BlueJ 1. Open up BlueJ. Click on the Project menu and select New Project. You should see the window on the right. Navigate to wherever you plan to save

More information

Data Representation Classes, and the Java API

Data Representation Classes, and the Java API Data Representation Classes, and the Java API CSC 1051 Data Structures and Algorithms I Dr. Mary-Angela Papalaskari Department of Computing Sciences Villanova University Course website: http://www.csc.villanova.edu/~map/1051/

More information

Chapter 2: Basic Elements of Java

Chapter 2: Basic Elements of Java Chapter 2: Basic Elements of Java TRUE/FALSE 1. The pair of characters // is used for single line comments. ANS: T PTS: 1 REF: 29 2. The == characters are a special symbol in Java. ANS: T PTS: 1 REF: 30

More information

Data Conversion & Scanner Class

Data Conversion & Scanner Class Data Conversion & Scanner Class Quick review of last lecture August 29, 2007 ComS 207: Programming I (in Java) Iowa State University, FALL 2007 Instructor: Alexander Stoytchev Numeric Primitive Data Storing

More information

Introduction to Java Unit 1. Using BlueJ to Write Programs

Introduction to Java Unit 1. Using BlueJ to Write Programs Introduction to Java Unit 1. Using BlueJ to Write Programs 1. Open up BlueJ. Click on the Project menu and select New Project. You should see the window on the right. Navigate to wherever you plan to save

More information

CSC Algorithms and Data Structures I. Midterm Examination February 25, Name:

CSC 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 information

Basic Computation. Chapter 2

Basic Computation. Chapter 2 Basic Computation Chapter 2 Increment and Decrement Operators Used to increase (or decrease) the value of a variable by 1 Easy to use, important to recognize The increment operator count++ or ++count The

More information

Constants. Why Use Constants? main Method Arguments. CS256 Computer Science I Kevin Sahr, PhD. Lecture 25: Miscellaneous

Constants. Why Use Constants? main Method Arguments. CS256 Computer Science I Kevin Sahr, PhD. Lecture 25: Miscellaneous CS256 Computer Science I Kevin Sahr, PhD Lecture 25: Miscellaneous 1 main Method Arguments recall the method header of the main method note the argument list public static void main (String [] args) we

More information

Introduction to Computer Science Unit 2. Exercises

Introduction to Computer Science Unit 2. Exercises Introduction to Computer Science Unit 2. Exercises Note: Curly brackets { are optional if there is only one statement associated with the if (or ) statement. 1. If the user enters 82, what is 2. If the

More information

Chapter 4 Classes in the Java Class Libraries

Chapter 4 Classes in the Java Class Libraries Programming Fundamental I ACS-1903 Chapter 4 Classes in the Java Class Libraries 1 Random Random The Random class provides a capability to generate pseudorandom values pseudorandom because the stream of

More information

1 Shyam sir JAVA Notes

1 Shyam sir JAVA Notes 1 Shyam sir JAVA Notes 1. What is the most important feature of Java? Java is a platform independent language. 2. What do you mean by platform independence? Platform independence means that we can write

More information

Using Classes and Objects Chapters 3 Creating Objects Section 3.1 The String Class Section 3.2 The Scanner Class Section 2.6

Using Classes and Objects Chapters 3 Creating Objects Section 3.1 The String Class Section 3.2 The Scanner Class Section 2.6 Using Classes and Objects Chapters 3 Creating Objects Section 3.1 The String Class Section 3.2 The Scanner Class Section 2.6 Instructor: Scott Kristjanson CMPT 125/125 SFU Burnaby, Fall 2013 2 Scope Creating

More information

Anatomy of a Method. HW3 is due Today. September 15, Midterm 1. Quick review of last lecture. Encapsulation. Encapsulation

Anatomy of a Method. HW3 is due Today. September 15, Midterm 1. Quick review of last lecture. Encapsulation. Encapsulation Anatomy of a Method September 15, 2006 HW3 is due Today ComS 207: Programming I (in Java) Iowa State University, FALL 2006 Instructor: Alexander Stoytchev Midterm 1 Next Tuesday Sep 19 @ 6:30 7:45pm. Location:

More information

Chapter 4: Writing Classes

Chapter 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 information

COMP-202 More Complex OOP

COMP-202 More Complex OOP COMP-202 More Complex OOP Defining your own types: Remember that we can define our own types/classes. These classes are objects and have attributes and behaviors You create an object or an instance of

More information

CSC 1051 Algorithms and Data Structures I. Midterm Examination February 25, Name: KEY A

CSC 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 information

CS 335 Java Programming Controls. Fall 2007

CS 335 Java Programming Controls. Fall 2007 CS 335 Java Programming Controls Fall 2007 Java Control Structures Selection: If, If/Else, Switch Repetition (looping): While, For, Do/While Assignment: Expressions, increment/decrement Java Reserved Words

More information

AP Computer Science Unit 1. Programs

AP Computer Science Unit 1. Programs AP Computer Science Unit 1. Programs Open DrJava. Under the File menu click on New Java Class and the window to the right should appear. Fill in the information as shown and click OK. This code is generated

More information

Introduction to Software Development (ISD) David Weston and Igor Razgon

Introduction to Software Development (ISD) David Weston and Igor Razgon Introduction to Software Development (ISD) David Weston and Igor Razgon Autumn term 2013 Course book The primary book supporting the ISD module is: Java for Everyone, by Cay Horstmann, 2nd Edition, Wiley,

More information

PIC 20A The Basics of Java

PIC 20A The Basics of Java PIC 20A The Basics of Java Ernest Ryu UCLA Mathematics Last edited: November 1, 2017 Outline Variables Control structures classes Compilation final and static modifiers Arrays Examples: String, Math, and

More information

Chapter Goals. Chapter 7 Designing Classes. Discovering Classes Actors (end in -er, -or) objects do some kinds of work for you: Discovering Classes

Chapter Goals. Chapter 7 Designing Classes. Discovering Classes Actors (end in -er, -or) objects do some kinds of work for you: Discovering Classes Chapter Goals Chapter 7 Designing Classes To learn how to discover appropriate classes for a given problem To understand the concepts of cohesion and coupling To minimize the use of side effects To document

More information

Interpreted vs Compiled. Java Compile. Classes, Objects, and Methods. Hello World 10/6/2016. Python Interpreted. Java Compiled

Interpreted vs Compiled. Java Compile. Classes, Objects, and Methods. Hello World 10/6/2016. Python Interpreted. Java Compiled Interpreted vs Compiled Python 1 Java Interpreted Easy to run and test Quicker prototyping Program runs slower Compiled Execution time faster Virtual Machine compiled code portable Java Compile > javac

More information

System.out.print(); Scanner.nextLine(); String.compareTo();

System.out.print(); Scanner.nextLine(); String.compareTo(); System.out.print(); Scanner.nextLine(); String.compareTo(); Starting Out with Java: From Control Structures Through Objects Sixth Edition Chapter 6 A First Look at Classes Chapter Topics 6.1 Objects and

More information

Object-Based Programming. Programming with Objects

Object-Based Programming. Programming with Objects ITEC1620 Object-Based Programming g Lecture 8 Programming with Objects Review Sequence, Branching, Looping Primitive datatypes Mathematical operations Four-function calculator Scientific calculator Don

More information

CSC 1051 Algorithms and Data Structures I. Midterm Examination February 26, Name: Key

CSC 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 information

BLOCK STRUCTURE. class block main method block do-while statement block if statement block. if statement block. Block Structure Page 1

BLOCK STRUCTURE. class block main method block do-while statement block if statement block. if statement block. Block Structure Page 1 BLOCK STRUCTURE A block is a bundle of statements in a computer program that can include declarations and executable statements. A programming language is block structured if it (1) allows blocks to be

More information

COMP 202. Java in one week

COMP 202. Java in one week COMP 202 CONTENTS: Basics of Programming Variables and Assignment Data Types: int, float, (string) Example: Implementing a calculator Java in one week The Java Programming Language A programming language

More information

Lecture 5: Methods CS2301

Lecture 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 information

Introduction to Computer Science I

Introduction to Computer Science I Introduction to Computer Science I String and Random Java Classes Janyl Jumadinova 12-13 February, 2018 Divide and Conquer Most programs are complex and involved. The best way to develop and maintain a

More information

CS61BL. Lecture 1: Welcome to CS61BL! Intro to Java and OOP Testing Error-handling

CS61BL. Lecture 1: Welcome to CS61BL! Intro to Java and OOP Testing Error-handling CS61BL Lecture 1: Welcome to CS61BL! Intro to Java and OOP Testing Error-handling About me Name: Edwin Liao Email: edliao@berkeley.edu Office hours: Thursday 3pm - 5pm Friday 11am - 1pm 611 Soda Or by

More information

Name: Checked: Access the Java API at the link above. Why is it abbreviated to Java SE (what does the SE stand for)?

Name: Checked: Access the Java API at the link above. Why is it abbreviated to Java SE (what does the SE stand for)? Lab 5 Name: Checked: Objectives: Learn about the Java API Practice using Math, Random, String, and other classes from the Java API Practice writing code to do basic String processing Preparation: Complete

More information

Computer Programming I - Unit 2 Lecture 1 of 13

Computer Programming I - Unit 2 Lecture 1 of 13 1 of 13 Precedence, Mixed Expressions, Math Methods, and Output Fmatting I. Precedence Rules - der of operations Introduction example: 4 + 2 X 3 =? A) Parenthesis, Division Multiplication (from left to

More information

Name: Checked: Access the Java API at the link above. Why is it abbreviated to Java SE (what does the SE stand for)?

Name: Checked: Access the Java API at the link above. Why is it abbreviated to Java SE (what does the SE stand for)? Lab 6 Name: Checked: Objectives: Learn about the Java API Test code snippets interactively to explore data representation and casts Practice using Math, Random, String, and other classes from the Java

More information

OBJECTS AND CLASSES CHAPTER. Final Draft 10/30/2011. Slides by Donald W. Smith TechNeTrain.com

OBJECTS AND CLASSES CHAPTER. Final Draft 10/30/2011. Slides by Donald W. Smith TechNeTrain.com CHAPTER 8 OBJECTS AND CLASSES Slides by Donald W. Smith TechNeTrain.com Final Draft 10/30/2011 Chapter Goals To understand the concepts of classes, objects and encapsulation To implement instance variables,

More information

H212 Introduction to Software Systems Honors

H212 Introduction to Software Systems Honors Introduction to Software Systems Honors Lecture #04: Fall 2015 1/20 Office hours Monday, Wednesday: 10:15 am to 12:00 noon Tuesday, Thursday: 2:00 to 3:45 pm Office: Lindley Hall, Room 401C 2/20 Printing

More information

Class Libraries and Packages

Class Libraries and Packages Class Libraries and Packages Wolfgang Schreiner Research Institute for Symbolic Computation (RISC) Johannes Kepler University, Linz, Austria Wolfgang.Schreiner@risc.jku.at http://www.risc.jku.at Wolfgang

More information

Chapter 4. Mathematical Functions, Characters, and Strings

Chapter 4. Mathematical Functions, Characters, and Strings Chapter 4 Mathematical Functions, Characters, and Strings 1 Outline 1. Java Class Library 2. Class Math 3. Character Data Type 4. Class String 5. printf Statement 2 1. Java Class Library A class library

More information

CSCE3193: Programming Paradigms

CSCE3193: 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 information

Tester vs. Controller. Elementary Programming. Learning Outcomes. Compile Time vs. Run Time

Tester vs. Controller. Elementary Programming. Learning Outcomes. Compile Time vs. Run Time Tester vs. Controller Elementary Programming EECS1022: Programming for Mobile Computing Winter 2018 CHEN-WEI WANG For effective illustrations, code examples will mostly be written in the form of a tester

More information

Example: Tax year 2000

Example: Tax year 2000 Introductory Programming Imperative Programming I, sections 2.0-2.9 Anne Haxthausen a IMM, DTU 1. Values and types (e.g. char, boolean, int, double) (section 2.4) 2. Variables and constants (section 2.3)

More information

CS111: PROGRAMMING LANGUAGE II

CS111: PROGRAMMING LANGUAGE II 1 CS111: PROGRAMMING LANGUAGE II Computer Science Department Lecture 1: Introduction Lecture Contents 2 Course info Why programming?? Why Java?? Write once, run anywhere!! Java basics Input/output Variables

More information

Elementary Programming

Elementary Programming Elementary Programming EECS1022: Programming for Mobile Computing Winter 2018 CHEN-WEI WANG Learning Outcomes Learn ingredients of elementary programming: data types [numbers, characters, strings] literal

More information

COMP 202 Java in one week

COMP 202 Java in one week CONTENTS: Basics of Programming Variables and Assignment Data Types: int, float, (string) Example: Implementing a calculator COMP 202 Java in one week The Java Programming Language A programming language

More information

Using Java Classes Fall 2018 Margaret Reid-Miller

Using Java Classes Fall 2018 Margaret Reid-Miller Using Java Classes 15-121 Fall 2018 Margaret Reid-Miller Today Strings I/O (using Scanner) Loops, Conditionals, Scope Math Class (random) Fall 2018 15-121 (Reid-Miller) 2 The Math Class The Math class

More information

Decisions: Logic Java Programming 2 Lesson 7

Decisions: Logic Java Programming 2 Lesson 7 Decisions: Logic Java Programming 2 Lesson 7 In the Java 1 course we learned about if statements, which use booleans (true or false) to make decisions. In this lesson, we'll dig a little deeper and use

More information

Entry Point of Execution: the main Method. Elementary Programming. Learning Outcomes. Development Process

Entry Point of Execution: the main Method. Elementary Programming. Learning Outcomes. Development Process Entry Point of Execution: the main Method Elementary Programming EECS1021: Object Oriented Programming: from Sensors to Actuators Winter 2019 CHEN-WEI WANG For now, all your programming exercises will

More information

Full file at

Full file at Chapter 2 Introduction to Java Applications Section 2.1 Introduction ( none ) Section 2.2 First Program in Java: Printing a Line of Text 2.2 Q1: End-of-line comments that should be ignored by the compiler

More information

Flexible data exchange with a method Parameters and return value

Flexible data exchange with a method Parameters and return value Chapter 9 Flexible data exchange with a method Parameters and return value A method provides flexibility as to where in the code its task is described to be performed: anywhere the method is called. Up

More information

Introduction to Computer Science Unit 2. Notes

Introduction to Computer Science Unit 2. Notes Introduction to Computer Science Unit 2. Notes Name: Objectives: By the completion of this packet, students should be able to describe the difference between.java and.class files and the JVM. create and

More information

Example packages from Java s standard class library:

Example packages from Java s standard class library: CBOP3203 A class library is a set of classes that supports the development of programs. Java contains an extensive library of prewritten classes you can use in your programs. These classes are divided

More information

CSC 1051 Data Structures and Algorithms I

CSC 1051 Data Structures and Algorithms I Repetition 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/ Some slides in this

More information

Chapter VI. Using Object Methods. Chapter VI Topics

Chapter VI. Using Object Methods. Chapter VI Topics Chapter VI Using Object Methods Chapter VI Topics 6.1 Introduction 6.2 Classes and Objects 6.3 Using Object Methods 6.4 Using the Random Class 6.5 Using the DecimalFormat Class 6.6 Working with Graphics

More information

Overview. Software Code is Everywhere. Software Crisis. Software crisis Development approaches Reusability Java packages API Sample classes:

Overview. Software Code is Everywhere. Software Crisis. Software crisis Development approaches Reusability Java packages API Sample classes: Overview Software crisis Development approaches Reusability Java packages API Sample classes: String, Random, StringBuffer, StringTokenizer 8 November 2007 Ariel Shamir 1 Software Code is Everywhere Televisions:

More information

Packages. Examples of package names: points java.lang com.sun.security drawing.figures

Packages. Examples of package names: points java.lang com.sun.security drawing.figures Packages To make classes easier to find and to use, to avoid naming conflicts, and to control access, programmers bundle groups of related classes and interfaces into packages. A package is a program module

More information

Chapter 4 Writing Classes

Chapter 4 Writing Classes Chapter 4 Writing Classes Java Software Solutions Foundations of Program Design Seventh Edition John Lewis William Loftus Writing Classes We've been using predefined classes from the Java API. Now we will

More information

Full file at

Full file at Chapter 2 Console Input and Output Multiple Choice 1) Valid arguments to the System.out object s println method include: (a) Anything with double quotes (b) String variables (c) Variables of type int (d)

More information

Objects and Classes 1: Encapsulation, Strings and Things CSC 121 Fall 2014 Howard Rosenthal

Objects and Classes 1: Encapsulation, Strings and Things CSC 121 Fall 2014 Howard Rosenthal Objects and Classes 1: Encapsulation, Strings and Things CSC 121 Fall 2014 Howard Rosenthal Lesson Goals Understand objects and classes Understand Encapsulation Learn about additional Java classes The

More information

AP CS Unit 3: Control Structures Notes

AP CS Unit 3: Control Structures Notes AP CS Unit 3: Control Structures Notes The if and if-else Statements. These statements are called control statements because they control whether a particular block of code is executed or not. Some texts

More information

IQTIDAR ALI Lecturer IBMS Agriculture University Peshawar

IQTIDAR ALI Lecturer IBMS Agriculture University Peshawar IQTIDAR ALI Lecturer IBMS Agriculture University Peshawar Upon completing the course, you will understand Create, compile, and run Java programs Primitive data types Java control flow Operator Methods

More information

Chapter 2: Data and Expressions

Chapter 2: Data and Expressions Chapter 2: Data and Expressions CS 121 Department of Computer Science College of Engineering Boise State University April 21, 2015 Chapter 2: Data and Expressions CS 121 1 / 53 Chapter 2 Part 1: Data Types

More information

CS 121 Intro to Programming:Java - Lecture 7 Professor Robert Moll (+ TAs) CS BLDG 276-545-4315 moll@cs.umass.edu course web page below http://twiki-edlab.cs.umass.edu/bin/view/moll121/webhome Announcements

More information

COMP-202 Unit 8: Basics of Using Objects

COMP-202 Unit 8: Basics of Using Objects COMP-202 Unit 8: Basics of Using Objects CONTENTS: Concepts: Classes and Objects Creating and Using Objects Introduction to Basic Java Classes (String, Scanner, ArrayList,...) Introduction (1) As we know,

More information

AP Computer Science A

AP Computer Science A AP Computer Science A 2nd Quarter Notes Table of Contents - section links - Click on the date or topic below to jump to that section Date: 11/9/2017 Aim: Binary Numbers (lesson 14) Number Systems Date:

More information