Programming and Problem Solving with Java

Knowledge Goals To understand the difference between syntax and semantics To see why it is important to use meaningful identifi ...

CHAPTER 1906 The National Electrical Signaling Company’s radio station in Massachusetts hosts the first broadcasted radio progra ...

(^42) | Java Syntax and Semantics, Classes, and Objects 2.1 The Elements of Java Programs In this section we examine in turn eac ...

2.1 The Elements of Java Programs | 43 Metalanguages Metalanguageis the word languagewith the prefix meta, which means “beyond” ...

(^44) | Java Syntax and Semantics, Classes, and Objects To read the diagrams, start at the left and follow the arrows. When you ...

2.1 The Elements of Java Programs | 45 Let’s look at an example. This template defines a Java identifier, which is Java’s way of ...

(^46) | Java Syntax and Semantics, Classes, and Objects Now let’s look at the syntax template for a Java application: A Java app ...

2.1 The Elements of Java Programs | 47 in Java), or a place in the computer’s memory that holds data (called a fieldin Java). Id ...

(^48) | Java Syntax and Semantics, Classes, and Objects of processing the computer can perform on it. Recall from Chapter 1 that ...

2.1 The Elements of Java Programs | 49 Notice that each character is enclosed in single quotes (apostrophes). The Java compiler ...

(^50) | Java Syntax and Semantics, Classes, and Objects is, Java treats the sequence of two characters \’as a single character r ...

2.1 The Elements of Java Programs | 51 turns an object of the class type. The object that is returned is an instance of the clas ...

(^52) | Java Syntax and Semantics, Classes, and Objects When we first showed the syntax template for a Java application, we ment ...

2.1 The Elements of Java Programs | 53 Don’t worry if you don’t understand everything shown here. This code includes some elemen ...

(^54) | Java Syntax and Semantics, Classes, and Objects Java provides operations for joining strings, comparing strings, copying ...

2.1 The Elements of Java Programs | 55 (^1) Many early programming languages, some of which are still in use today, allow a valu ...

(^56) | Java Syntax and Semantics, Classes, and Objects Here, Modifiers are like the modifiers for the class declarations (publi ...

2.1 The Elements of Java Programs | 57 In Java, as in mathematics, a constant is something whose value never changes. When we us ...

(^58) | Java Syntax and Semantics, Classes, and Objects As shown in the preceding code, many Java programmers capitalize the ent ...

2.1 The Elements of Java Programs | 59 They store “Introduction to “as the value for constantWORD1. The string “Programming and ...