visual basic 2008 barcode generator Arrays in Java

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CHAPTER 5 Arrays
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Some programmers call a multidimensional array as an array of an array For example, a two-dimensional array has two lists of array elements Each element of the first list (first dimension) points to another array (second dimension) Programmers use multidimensional arrays to organize lists of relation information so that these lists can be manipulated within a Java program However, programmers usually work with a multidimensional array that has no more than two dimensions because an array of any more dimensions is difficult to work with
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Creating a Multidimensional Array
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You declare a multidimensional array by using the new operator, which is very similar to the way you use the new operator for a single-dimensional array The following example illustrates how this is done This example declares a two-dimensional array The first dimension consists of three array elements, and the second dimension consists of two array elements Think of this as saying, each of the three array elements has two array elements of its own (see Figure 5-1)
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class Demo { public static void main (String args[]) { int grades[][] = new int [3][2]; } }
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You can declare additional dimensions by inserting a pair of square brackets for each additional dimension For example, here s the declaration for a three-dimensional array:
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int grades[][][] = new int [5][2][3];
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A three-dimensional array can be a little difficult to comprehend because we re not used to organizing data in three dimensions Think of a three-dimensional array this way: Each array element in the first dimension has two array elements of its own, and each of those three array elements has two array elements of its own
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grades[0][0]
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grades[0][1]
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grades[2][0]
grades[2][1]
Figure 5-1
Each element of the first dimension has its own two elements
Java Demystified
Values Assigned to Array Elements
An element of an array is used in an expression similar to how a variable is used in an expression The only difference between a variable and an array element is that you must specify both the array name and the index when using an array element You can assign a value to an array element by using the assignment operator, as shown here This example assigns 90 to the first array element of the grades array:
grades[0] = 90;
The value assigned to an array element is used in an expression similar to how you use the value of a variable in an expression This is illustrated in the following example, where the value of grades[0] is assigned to the second element of the array grades:
grades[1] = grades[0];
You assign a value to a multidimensional array practically the same way you do in a single-dimensional array, except you must use the index of both dimensions when referencing the array element The following example assigns a grade to the second element (second dimension) of the first array element (first dimension):
grades[0][1] = 90;
Likewise, you reference each dimension of a multidimensional array whenever you need to access the value stored in an array element This is illustrated in the following example, where the value assigned to the second element (second dimension) of the first array element (first dimension) is assigned to the third element of the first array element:
grades[0][2] = grades[0][1];
The same format is used for arrays that contain more than two dimensions, except that you ll need to include each dimension when referencing an array element in the expression
The Length Data Member
Sometimes when working with arrays, you ll need to refer to the length of the array For example, suppose you want to access each array element You can do this quite easily by using a for loop As you ll recall from the previous chapter, a for loop can use a control variable and a conditional expression that evaluates the value of the
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