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The relational operators all have the same level of precedence and associate from left to right. We will see an example shortly.Ĭonditions in if structures can be formed by using the equality operators and relational operators summarized in Fig. If the condition is not met (i.e., the condition is false), the body statement does not execute. If the condition is met (i.e., the condition is true), the statement in the body of the if structure is executed. This section introduces a simple version of Java’s if structure that allows a program to make a decision based on the truth or falsity of some condition.
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2.8 Decision Making: Equality and Relational Operators Using parentheses for complex arithmetic expressions, even when the parentheses are not necessary, can make the arithmetic expressions easier to read. For example, the preceding assignment statement might be parenthesized as follows: Such unnecessary parentheses are also called redundant parentheses. Figure 2.18 illustrates the order in which the operators are applied in the preceding seconddegree polynomial.Īs in algebra, it is acceptable to place unnecessary parentheses in an expression to make the expression clearer. Suppose that a, b, c and x are initialized as follows: a = 2, b = 3, c = 7 and x = 5. There is no arithmetic operator for exponentiation in Java x 2 is represented as x * x. The circled numbers under the preceding statement indicate the order in which Java applies the operators. To develop a better understanding of the rules of operator precedence, consider the evaluation of a second-degree polynomial ( y = ax 2 + bx + c): Rather, these parentheses are on the same level. For example, the expressionĭoes not contain nested parentheses. Not all expressions with several pairs of parentheses contain nested parentheses. These operations are also applied from left to right. The addition and subtraction operations are evaluated next. The multiplication, modulus and division operations are evaluated first in left-to- right order (i.e., they associate from left to right), because they have higher precedence than that of addition and subtraction. The circled numbers under the statement indicate the order in which Java applies the operators. 22.8 Internet and World Wide Web Resources.22.3 Formatting and Saving Captured Media.20.8 Bit Manipulation and the Bitwise Operators.18.7 Internet and World Wide Web Resources.18.2 Loading, Displaying and Scaling Images.17.5 Establishing a Simple Client Using Stream Sockets.17.4 Establishing a Simple Server Using Stream Sockets.15.4 Thread Priorities and Thread Scheduling.15.3 Thread States: Life Cycle of a Thread.13.3 Creating a Customized Subclass of JPanel.11.5 Drawing Lines, Rectangles and Ovals.11.2 Graphics Contexts and Graphics Objects.10.21 Card Shuffling and Dealing Simulation.10.2 Fundamentals of Characters and Strings.9.19 Case Study: Creating and Using Interfaces.9.18 Case Study: Inheriting Interface and Implementation.9.14 Abstract Superclasses and Concrete Classes.9.5 Constructors and Finalizers in Subclasses.8.16 Data Abstraction and Encapsulation.8.2 Implementing a Time Abstract Data Type with a Class.7.8 Searching Arrays: Linear Search and Binary Search.
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6.13 Example Using Recursion: The Fibonacci Series.5.8 Labeled break and continue Statements.3.7 Java Applet Internet and World Wide Web Resources.3.4 Two More Simple Applets: Drawing Strings and Lines.3.3 A Simple Java Applet: Drawing a String.3.2 Sample Applets from the Java 2 Software Development Kit.2.8 Decision Making: Equality and Relational Operators.2.5 Another Java Application: Adding Integers.1.14 General Notes about Java and This Book.1.12 The Internet and the World Wide Web.Introduction to Computers, the Internet and the Web.