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Encode Quick Response Code in Java Data Types and Variables

CHAPTER 2 Data Types and Variables
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Not all characters used in your program are printable characters Some characters cannot be printed on the screen These are called nonprintable characters and are used to give special direction to the computer and to programs Nonprintable characters are the first 32 characters defined in the Unicode table Table 2-2 shows the more commonly used nonprintable characters For example, you use a nonprintable character each time you want a new line to appear in a word processing document You don t see the newline character because it isn t displayed on the screen Instead, the word processor recognizes the newline character as a special command to move the cursor to the beginning of a new line You write a nonprintable character into your program by using the escape character followed by the symbol in the Unicode table that is used to represent the nonprintable character The forward slash (\) is the escape character in Java The combination of the escape character and the symbol used to represent the nonprintable character is called an escape sequence The escape sequence is also referred to as a control sequence or control character because nonprintable characters are commonly used to control the behavior of programs and sometimes hardware The follow example illustrates how to write an escape sequence in a program Here, the newline escape sequence (\n) is used to place the second portion of the text on its own line Notice that the escape sequence consists of two characters The first character is the forward slash, and the second character is the symbol found on the Unicode table However, the escape sequence is enclosed within single quotation marks because both characters are treated as single characters and not as two characters
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class Demo { public static void main( String args[]) { Systemoutprintln("Line 1" + '\n' + "Line 2"); } }
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Escape Character \n \t \r \f \b Description Newline character (also called a linefeed character) Tab character Carriage return character Formfeed character Backspace character
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Table 2-2
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A string is a series of related characters, such as the name Amber Leigh You write a string literal in a program by enclosing the series of characters in double quotations on a single line The most common use of a string literal in a program is to initialize a String object You ll learn about String objects in 7 For now, think of a String object as something that is used to store a string literal in memory and lets you do things with the string literal such as counting the number of characters in it The following example shows how to write a string literal to initialize a String object:
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class Demo { public static void main( String args[]) { String name = "Amber Leigh"; } }
Data Types
When some people who are learning computer programming hear the term memory, they go into a state of panic because memory is something abstract It is difficult to imagine what memory is because no one can really feel and touch it However, there isn t any need to panic when learning about memory Think of memory as a bunch of empty boxes Each box can hold eight binary digits (bits), collectively known as a byte, as you learned in 1 A number called a memory address uniquely identifies each box Fortunately, you don t have to be concerned about memory addresses because Java handles memory addresses for your However, you do have to be concerned about telling Java how many boxes you ll need to store data in memory Let s say your program needs to store an integer into memory An integer takes up four boxes (four bytes) Therefore, you need to tell Java to reserve four boxes of memory for your program before your program can store the integer into memory No programmer wants to memorize the number of boxes (bytes) needed to store various kinds of data into memory So, instead of telling Java to reserve a specific number of boxes, programmers simply use a keyword that tells Java the kind of data the program needs to store in memory This keyword is called a data type A data type tells Java how much memory to reserve and the kind of data that will be stored in that memory location A data type also tells Java the kinds of operation that can be performed using the data stored at that memory location Table 2-3 lists the data types used to tell Java the amount of boxes (bytes) of memory to reserve
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