visual basic 2008 barcode generator Data Types and Variables in Java

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CHAPTER 2 Data Types and Variables
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long
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The long data type is the best choice whenever your program needs to store very large whole numbers that are beyond the range of the int data type Always consult Table 2-3 to determine whether an integer value used by your program is beyond the range of the int data type
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Floating-point Data Types
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The floating-point data type group consists of data types used to store real numbers A real number contains a whole number and a decimal value There are two data types in the floating-point data type group: float and double
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float
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A float data type is used to store single-precision values and is perfect for storing United States currency, where a fraction of a penny isn t critical to the program However, you should always verify the result of any calculation that uses a data type in the floating-point data type group to ensure that the value isn t truncated Truncation occurs when one or more digits to the left of the decimal are dropped because of insufficient room in memory to store those digits
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The double data type is used when you have very large or very small values that are beyond the range of a float A double data type is used to store double-precision values
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Character Data Type
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The character data type group contains the char data type, which is used to store a character in memory Previously in this chapter, you learned that each character is assigned an integer in Unicode It is this integer that is stored in memory Besides telling Java that the program needs to store a character in memory, the char data type tells Java how to interpret the integer that represents the character As you saw at the beginning of this chapter, the letter B is assigned the integer 66 in Unicode This means when your program stores the letter B in memory, Java stores the integer 66 in memory (66 is a number, just as if you stored the number 66 in memory) However, by using the char data type, you are telling Java that 66 must be
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interpreted as Unicode and not as a number This means that the character B is used within the program and not the integer 66
Boolean Data Type
The Boolean data type group consists of the boolean data type The boolean data type tells Java to reserve memory sufficient to store a Boolean value A Boolean value is either true or false You should use a boolean data type whenever your program needs to store one of two possible values that represents the state of a condition, such as on/off, true/false, yes/no, or 0/1 Java will then decide how to efficiently store this condition in memory
Casting Data Types
Sometimes your program will call a method that performs a specific functionality and then returns a value to your program However, the value returned by the method maybe of a data type different from the data type you used to tell Java to reserve memory for your program Let s say the prompt needs to read a character from the keyboard In order to do this, you need to call the Systeminread() method You ll learn how to do this in 11 For now, you need to know that this method returns the character entered into the keyboard as the integer that corresponds to the character s Unicode value Suppose that your program saves the return value from the Systeminread() method as a character instead of as an integer, as shown in the following example The name choice is called a variable You ll learn about variables in the next section For now, think of a variable as a name that you assign to the box of memory that is used to store the character read from the keyboard Also notice that the char data type is used to tell Java to reserve enough memory to store the character You re also telling Java that you ll be using the name choice throughout your program to refer to that memory location (box of memory)
class Demo { public static void main( String args[]) { char choice = Systeminread(); } }
There is a problem, however The Systeminread() method returns an integer (technically a byte data type) Memory is reserved to store a char data type These are unlike data types An error message is displayed when you try compiling this example
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