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Method name
Creating QR Code 2d Barcode In Java
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Recognize QR Code In Java
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Method argument list
Barcode Generation In Java
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Bar Code Recognizer In Java
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Method body
Encode QR-Code In Visual C#
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QR Code JIS X 0510 Generation In .NET
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No method return value
Print QR-Code In .NET Framework
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Generate QR Code ISO/IEC18004 In VB.NET
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Figure 1-3
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All Java applications must have a main() method because the main() method is the entry point to the application
Printing UPC Code In Java
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Bar Code Generation In Java
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CHAPTER 1 Inside Java
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The method s return value is the data returned to the part of the program that requested the method to perform its functionality Not all methods have a return value, which you ll learn about in 5 In this example, the main() method doesn t have a return value Therefore, we must precede the name of the method with the keyword void, which indicates there isn t a return value You ll notice that two other keywords are used alongside the name of the main() method These are public and static The keyword public means that the method can be called from outside the class definition The main() method is also public because it is called by the Java Virtual Machine The keyword static is an advanced topic that is discussed in 5 For now, simply know that the static keyword must appear in the method definition
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Statement
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As you learned earlier in this chapter, a statement is an instruction to the computer to do something This example contains one statement that tells the computer to display the words Hello world! on the screen As shown in Figure 1-4, this statement calls one of Java s standard methods: println() You ll learn about the println() method in 5 For now, it is important to understand that the functionality of the println() method is to display data on the screen However, you must tell the println() method what data you want displayed You do this by placing the data between the parentheses when calling the println() method In this case, the words Hello world! are placed between the parentheses and appear on the screen Finally, every statement in a Java program must end in a semicolon (;) Otherwise, the compiler won t recognize the statement and is likely to display an error message when you try to compile the program
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Statement
Semicolon
Calling a method to display text on the screen
Text displayed on the screen
Figure 1-4
This statement tells Java to display Hello world! on the screen
Java Demystified
Quiz
1 What is a compiler 2 What is a high-level programming language 3 What is machine language 4 What is a key difference between C and Java 5 What is a key difference between C++ and Java 6 What is bytecode 7 What is the Java Virtual Machine 8 What is the purpose of the main() method in a Java application 9 Must all Java classes have at least one attribute declared 10 What happens after the last statement in the main() method executes
CHAPTER
Data Types and Variables
Practically every Java program you write focuses on data and instructions Data is information used by a computer to execute an instruction given to it by you, the programmer Let s begin our trek toward mastering Java by taking a close look at data You ll learn what data is, how to store data in memory, and how your Java programs can use data to achieve the goals of your program
Data and Numbers
For many of us, the terms information and data are synonymous However, information and data are distinctly different Data is the smallest amount of meaningful information No doubt this sounds like technical double talk, so let s look at an example to illustrate the difference between data and information
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Java Demystified
A person s name is information and not data because a person s name can be reduced to a person s first name, middle name, and last name A person s first name, middle name, and last name are data because they cannot be reduced to smaller amounts of meaningful information It is important to make a distinction between information and data because a Java program uses data and not information That is, you don t instruct a computer to ask the users of your program to enter their name Instead, the users are prompted to enter a first name, middle name, and last name We view data as one or more characters that can be a mixture of alphabetical characters, numeric characters, and symbols such as punctuation However, a computer sees data as a series of numbers represented as numbers of the binary numbering system These are the much talked about zeros and ones Numbering system is one of those intimidating terms that conjure images of dreaded math courses However, a number system is nothing more than a way of counting, something you probably learned in the third grade We use the decimal numbering system all the time to count The decimal number system has ten digits, which are 0 through 9 When we reach 9, we carry over 1 to the left column and begin counting again from 0
9 + 1 10
However, many other numbering systems exist All of them do exactly the same thing They are used to count The only difference among numbering systems is the number of digits You ll encounter three numbering systems as you read computer books: the octal numbering system, the hexadecimal numbering system, and the binary numbering system The octal numbering system consists of eight digits, from 0 through 7 When you reach 7, you carry over 1 to the left column and begin counting again This is illustrated in the follow example The sum of this addition calculation looks wrong because we ve learned that 7 + 1 = 8 and not 10 However, this is only true if we use the decimal numbering system However, the octal numbering system is used in this example, so the following sum is correct:
7 + 1 10
The hexadecimal numbering system has 16 digits Hex, which is what programmers called the hexadecimal numbering system, is baffling at first glance because it
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