Java with BlueJ, 2016a

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10 CHAPTER 1. INTRODUCTION In 2010 Oracle acquired Sun Microsystems and took over the development of the language. The language has gone through a number of updates, and at the time of writing the current release is referred to as Java 8. All programs in this text have been tested on Java 8. This text is about programming Java applications. The student may be interested Java applets (these run in a web browser) which are discussed in a future appendix.
1.2. THE JAVA COMPILER AND THE JAVA VIRTUAL MACHINE 11 1.2 The Java Compiler and the Java Virtual Machine When someone develops a Java program they must first enter the Java code in a text file. Such files have names that end with ”.java” and are known as source code files. In order to execute a Java program the program must first be translated into Java bytecode. We say source code files are humanreadable but bytecode files are just 0’s and 1’s and are not human-readable. A program that performs this transation is called a compiler, andwesay that the source code is compiled into bytecode. The compiler made available by Oracle is called javac. Bytecode files always have a name that ends with ”.class”. The bytecode is not directly executable on a computer - bytecode is not machine code, but it is close to that. Bytecode is ”executed” by a special program call the Java Virtual Machine, or JVM. Java programs are portable in the sense that you can write a program and deploy it anywhere - as long as there is a JVM for that platform. The process of developing, compiling, and running a Java program is shown below.
Page 1 and 2: Java with BlueJ Part I Ron McFadyen
Page 3 and 4: To Callum 3
Page 5 and 6: Contents 1 Introduction 9 1.1 Java,
Page 7 and 8: Preface This book is Part I of a tw
Page 9: Chapter 1 Introduction This book is
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
Page 27 and 28: 2.3. PRIMITIVE DATA TYPES 27 14 Sys
Page 29 and 30: 2.3. PRIMITIVE DATA TYPES 29 2.3.3
Page 31 and 32: 2.3. PRIMITIVE DATA TYPES 31 Exampl
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Page 41 and 42: 2.3. PRIMITIVE DATA TYPES 41 use in
Page 43 and 44: 2.4. OPERATORS 43 2.4 Operators We
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Page 47 and 48: 2.5. THE STRING CLASS 47 Since text
Page 49 and 50: 2.5. THE STRING CLASS 49 name of th
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Page 53 and 54: 2.5. THE STRING CLASS 53 Exercises
Page 55 and 56: 2.6. OUTPUT 55 12 // Each time prin
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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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Bibliography [1] http://publication
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