Java with BlueJ, 2016a

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6 CONTENTS 3.3 if . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78 3.4 for . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89 3.5 do ...while . . . . . . . . . . . . . . . . . . . . . . . . . . . 104 3.6 switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109 4 Classes in the Java Class Libraries 115 4.1 Random . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115 4.2 Character . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120 4.3 Scanner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127 4.4 Math . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134 4.5 Integer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137 5 ArrayLists 141 6 One-Dimensional Arrays 149 6.1 Initializing arrays . . . . . . . . . . . . . . . . . . . . . . . . . 151 6.2 Storage of arrays and copying arrays . . . . . . . . . . . . . . 152 6.3 The enhanced for . . . . . . . . . . . . . . . . . . . . . . . . . 153 6.4 Passing string values into main() . . . . . . . . . . . . . . . . 155 6.5 Parallel arrays . . . . . . . . . . . . . . . . . . . . . . . . . . 156 6.6 Partially filled arrays . . . . . . . . . . . . . . . . . . . . . . . 158 6.7 Array utilities in Java class libraries . . . . . . . . . . . . . . 161 7 Designing Java Classes 165 7.1 Using Multiple Classes . . . . . . . . . . . . . . . . . . . . . . 167 7.2 Fields . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168 7.3 Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171 7.4 Constructors . . . . . . . . . . . . . . . . . . . . . . . . . . . 176 7.5 Visibility Specifications: Public, Private . . . . . . . . . . . . 180 7.6 Overloading . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182 7.7 Associations . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183 7.8 Reusing code . . . . . . . . . . . . . . . . . . . . . . . . . . . 188 7.9 Parameter lists and arguments . . . . . . . . . . . . . . . . . 190 7.10 Varargs: a variable number of arguments . . . . . . . . . . . . 193 7.11 Code listings: Student, Subject . . . . . . . . . . . . . . . . . 195 8 A Brief Introduction to Graphical User Interfaces 203 8.1 Brief Introduction to Simple GUI Builder . . . . . . . . . . . 205 8.1.1 Listings . . . . . . . . . . . . . . . . . . . . . . . . . . 214
Preface This book is Part I of a two-part set that introduces the Java programming language. The text assumes the student will be using the BlueJ development environment and provides some introductory BlueJ material. Our experience has been that BlueJ is easy to learn and provides a good programming environment for the beginner programmer. The material in chapters 1 through 5, and 7 are required topics. • Chapter 1: This is a high-level introduction to Java. The typical HelloWorld program is discussed along with how to run HelloWorld in BlueJ. • Chapter 2: Basic concepts having to do with constants, variables, data types, expressions and input/output are covered. • Chapter 3: This chapter covers the major control structures a programmer uses. • Chapter 4: Java provides a great deal of functionality in its class libraries. In this chapter we introduce several of these classes such as Random . . . Random gives the programmer the ability to simulate throwing dice or tossing coins. As well, useful functionality in utility classes such as Math, Integer, and Character are covered. • Chapter 5: Many applications require a program to work with collections of data. For example, the set of courses at a university is a collection. Java programs must be able to manage such a set and the ArrayList data structure is well-suited to the task. • Chapter 7: The program code in a Java system is managed in structureswherethebasiccomponentistheclass. A Java class contains data and executable code. This chapter covers concepts that must be understood if one is to design and implement a Java-based system. 7
Page 1 and 2: Java with BlueJ Part I Ron McFadyen
Page 3 and 4: To Callum 3
Page 5: Contents 1 Introduction 9 1.1 Java,
Page 9 and 10: Chapter 1 Introduction This book is
Page 11 and 12: 1.2. THE JAVA COMPILER AND THE JAVA
Page 13 and 14: 1.4. A FIRST PROGRAM 13 1.4 A First
Page 15 and 16: 1.5. USING BLUEJ TO RUN HELLOWORLD
Page 17 and 18: 1.5. USING BLUEJ TO RUN HELLOWORLD
Page 19 and 20: Chapter 2 Basics This chapter cover
Page 21 and 22: 2.2. VARIABLES 21 Listing 2.1: Usin
Page 23 and 24: 2.3. PRIMITIVE DATA TYPES 23 Exerci
Page 25 and 26: 2.3. PRIMITIVE DATA TYPES 25 Defaul
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2.6. OUTPUT 57 Test your program wi
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2.6. OUTPUT 59 • Lines 14 and 15
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2.7. INPUT 61 2.7 Input We examine
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2.7. INPUT 63 Figure 2.8: Terminal
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2.7. INPUT 65 2.7.2 The JOptionPane
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Chapter 3 Control Structures Progra
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3.2. WHILE 69 A logical expression
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3.2. WHILE 71 Figure 3.1: Output fr
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3.2. WHILE 73 An example of output
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3.2. WHILE 75 25 } 26 } Figure 3.2:
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3.2. WHILE 77 Autoincrement Because
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3.3. IF 79 Example 1 Suppose one ne
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3.3. IF 81 Exercises 15. Write a pr
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3.3. IF 83 9 { 10 public static voi
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3.3. IF 85 Listing 3.6: Using an if
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3.3. IF 87 the indentation. Each of
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3.4. FOR 89 3.4 for The for stateme
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3.4. FOR 91 Example 1 Below we use
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3.4. FOR 93 Table 3.1: Process indi
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3.4. FOR 95 Example 4 The program i
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3.4. FOR 97 Example 5 In this examp
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3.4. FOR 99 . . . Step 2, formattin
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3.4. FOR 101 Exercises 20. Modify t
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3.4. FOR 103 34. Modify the previou
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3.5. DO ...WHILE 105 Example 1 Let
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3.5. DO ...WHILE 107 Listing 3.16:
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3.6. SWITCH 109 3.6 switch The swit
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3.6. SWITCH 111 Example 1 Previousl
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3.6. SWITCH 113 Exercises 39. Write
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Chapter 4 Classes in the Java Class
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4.1. RANDOM 117 Example 2 Consider
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4.1. RANDOM 119 Exercises 1. Modify
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4.2. CHARACTER 121 Example 1 Ifthed
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4.2. CHARACTER 123 Example 2 The Ch
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4.2. CHARACTER 125 Below is the out
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4.3. SCANNER 127 4.3 Scanner Previo
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4.3. SCANNER 129 Note that the abov
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4.3. SCANNER 131
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4.3. SCANNER 133 Exercises 11. Modi
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4.4. MATH 135 The Math Class Fields
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4.5. INTEGER 137 4.5 Integer The In
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4.5. INTEGER 139 Listing 4.9: Using
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Chapter 5 ArrayLists There are seve
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143 The enhanced for Thereisavariat
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145 Example 2 The contains() method
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147 20 people.add(new Random()); 21
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Chapter 6 One-Dimensional Arrays Th
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6.1. INITIALIZING ARRAYS 151 6.1 In
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6.3. THE ENHANCED FOR 153 6.3 The e
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6.4. PASSING STRING VALUES INTO MAI
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6.5. PARALLEL ARRAYS 157 18 } This
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6.6. PARTIALLY FILLED ARRAYS 159 Th
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6.7. ARRAY UTILITIES IN JAVA CLASS
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6.7. ARRAY UTILITIES IN JAVA CLASS
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Chapter 7 Designing Java Classes Up
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7.1. USING MULTIPLE CLASSES 167 7.1
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7.2. FIELDS 169 Figure 7.2: Class d
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7.3. METHODS 171 7.3 Methods A meth
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7.3. METHODS 173 Calling the other
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7.3. METHODS 175 void methods Somet
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7.4. CONSTRUCTORS 177 10 private St
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7.4. CONSTRUCTORS 179 Using constru
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7.5. VISIBILITY SPECIFICATIONS: PUB
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7.7. ASSOCIATIONS 183 7.7 Associati
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7.7. ASSOCIATIONS 185 Notice that t
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7.7. ASSOCIATIONS 187 Now reconside
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7.8. REUSING CODE 189 24 } The outp
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7.9. PARAMETER LISTS AND ARGUMENTS
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7.10. VARARGS: A VARIABLE NUMBER OF
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7.11. CODE LISTINGS: STUDENT, SUBJE
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Chapter 8 A Brief Introduction to G
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8.1. BRIEF INTRODUCTION TO SIMPLE G
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Java with BlueJ, 2016a

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