Java with BlueJ, 2016a

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30 CHAPTER 2. BASICS Operator Priorities Highest to Lowest * / % + - Multiplication is given the same priority as division and modulo, and addition is given the same priority as subtraction. However, the priority of multiplication, division, and modulo is higher than that of addition and subtraction. The following table shows expressions, the order of evaluation shown <strong>with</strong> equivalent sub-expressions, and the final result. <strong>Java</strong> expressions involving priorities expression equivalent evaluation final result 9.0 / 5.0 + 32.0 (9.0 / 5.0)+ 32.0 33.8 105 - 105 % 10 105 - (105 % 10) 100 1 + 3 * 2 1 + (3 * 2) 7 The next two examples show situations where operator priorities must be overridden in order to have correct calculations: Example: Calculate Net Pay Suppose we must calculate an employee’s net pay. Suppose for the employee we have their gross pay, deductions from gross, and their tax rate in variables named grossPay, deductions, andtaxRate respectively. Suppose net pay is calculated by subtracting deductions from gross pay and then multiplying bythetaxrate.Ifwecodethisas grossPay - deductions * taxRate we will get the wrong result since * has higher priority than -. Wecancode this using a sub-expression as: (grossPay - deductions)* taxRate
2.3. PRIMITIVE DATA TYPES 31 Example: Calculate Area of Trapezoid Consider the formula for calculating the area of a trapezoid: If we were to code the formula as a + b / 2 * h the area would be calculated incorrectly due to division and multiplication having higher priority than addition. To force the correct evaluation we can use a sub-expression and override operator priorities: the formula can be written as: (a + b)/ 2.0 * h Sub-expressions are used to change the order of evaluation . . . in this case to have a + b evaluated first before the division and multiplication.
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 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
Page 27 and 28: 2.3. PRIMITIVE DATA TYPES 27 14 Sys
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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
Page 51 and 52: 2.5. THE STRING CLASS 51 Example, d
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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Page 61 and 62: 2.7. INPUT 61 2.7 Input We examine
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Page 65 and 66: 2.7. INPUT 65 2.7.2 The JOptionPane
Page 67 and 68: Chapter 3 Control Structures Progra
Page 69 and 70: 3.2. WHILE 69 A logical expression
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Page 73 and 74: 3.2. WHILE 73 An example of output
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Page 77 and 78: 3.2. WHILE 77 Autoincrement Because
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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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