visual basic 2008 barcode generator Arrays in Java

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CHAPTER 5 Arrays
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You can use an array element in the same way you use a variable in your program Here are two common ways to use an array element The first statement assigns the integer 90 to the array element, and the second statement assigns the value of the array element to a variable:
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finalGrades[0] = 90; myFinalGrade = finalGrades[0];
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Allocating Memory for an Array
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Similar to a variable, you must tell Java to reserve memory for an array You do this by declaring an array Programmers call declaring an array allocating memory for the array Memory is allocated dynamically in a three-step process The first step is to declare a reference to the memory allocated for the array The second step is to reserve memory, and the third step is to assign the reserved memory location to the reference All three steps are shown in the following example:
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class Demo { public static void main (String args[]) { int finalGrades[] = new int[100]; } }
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Here s what is happening First, the new operator tells Java to reserve memory to hold 100 integers, as shown here:
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new int[100]
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The new operator then returns the address of the first memory location Think of the other memory locations reserved by the new operator being laid side by side in sequence next to the first memory location Java is also told to create a reference to an array of integers, as shown here:
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int finalGrades[]
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Think of a reference as something that points to the first memory address of the block of memory that is reserved for the array The reference is called finalGrades[] Then, Java is told to assign the address of the first memory location to the reference, as shown here:
int finalGrades[] = new int[100];
Here s an important point to remember whenever you declare an array: Always specify the number of array elements you need in the declaration of an array If you
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need 100 array elements, you place 100 in the declaration However, remember that the first index of an array is 0, not 1 Some programmers get confused and place 0 as the array size or 1 when referencing the first array element Both of these are incorrect
Initializing Arrays
Initialization is the process of placing an initial value in memory by assigning the value to either a variable or an array element In 2, you learned how to initialize a variable by assigning a value when the variable is declared, as shown here:
int myGrade = 0;
An array is initialized a little differently You place the initial values of each array element within braces, as shown in the following example:
class Demo { public static void main (String args[]) { int finalGrades[]= {95, 87, 93, 84, 79}; } }
Notice that you don t explicitly specify the array size Instead, the number of initial values implies the array size The previous example implies that the array has five array elements because five values are used to initialize the array A comma must separate each initial value, and all the initial values must be contained within braces Don t use the new operator to declare an array if you plan to initialize the array because Java dynamically allocates sufficient memory for the array using the initial values to determine the size of the array
Multidimensional Arrays
The arrays you ve seen so far in this chapter are called one-dimensional arrays because they consist of one list of array elements Think of the pair of square brackets used to declare an array as a dimension Arrays can have more than one dimension These are referred to as multidimensional arrays Think of a multidimensional array as being declared within two or more pairs of square brackets, where each square bracket is a dimension
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