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Property 9 allows the existence of arrays of arrays. Technically, Java allows multidimensional arrays only with primitive types. But for objects, an array of arrays is essentially the same thing. Since arrays themselves are objects, an array of arrays is an array of objects, and some of those component objects could also be nonarrays. (See Example 2.1.) Note that a consequence of Property 13 is that changing a reference component value to null has no effect upon the length of the array; null is still a valid value of a reference component. EXAMPLE 2.1 Some Array Definitions
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Here are some valid array definitions:
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public class ArrayDefs { public static void main(String[] args) { 3 float x[]; 4 x = new float[100]; 5 args = new String[10]; 6 boolean[] isPrime = new boolean[1000]; 7 int fib[] = {0, 1, 1, 2, 3, 5, 8, 13}; 8 short[][][] b = new short[4][10][5]; 9 double a[][] = {{1.1,2.2}, {3.3,4.4}, null, {5.5,6.6}, null}; 10 a[4] = new double[66]; 11 a[4][65] = 3.14; 12 Object[] objects = {x, args, isPrime, fib, b, a}; 13 } 14 } Line 3 declares x[] to be an array of floats but does not allocate any storage for the array. Line 4 defines x[] to have 100 float components.
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Line 5 declares args[] to be an array of 10 String objects. Note the two different (equivalent) ways to declare an array: The brackets may be a suffix on the type identifier or on the array identifier. Line 5 defines args[] to have 10 String components. Line 6 defines isPrime[] to be an array of 1000 boolean variables. Line 7 defines fib[] to be an array of 8 ints, initializing them to the 8 values listed. So for example, fib[4] has the value 3, and fib[7] has the value 13. Line 8 defines b[][][] to be a three-dimensional array of 4 components, each of which is a twodimensional array of 10 components, each of which is a one-dimensional array of 5 component elements of type short. Line 9 defines a[][] to be an array of five components, each of which is an array of elements of type double. Only three of the five component arrays are allocated. Then line 10 allocates a 66-element array of doubles to a[4], and line 11 assigns 3.14 to its last element. Line 12 defines the array objects to consist of six components, each of which is itself an array. The components of the first four component arrays are elements (nonarrays). But the components of the components b and a are not elements because they are also arrays. The actual elements of the objects array include 2, 5, and 13 (components of the component fib), null (components of the component a), and 2.2 and 3.14 (components of the components of the component a).
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The array a[][] defined in Example 2.1 is called a ragged array because it is a two-dimensional array with rows of different lengths. The element type of an array in Java can be a primitive type, a reference type, or an array type. The simplest, of course, are arrays of primitive type elements, such as x[], isPrime[], and fib[] in Example 2.1. These are arrays that can be sorted.
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DUPLICATING AN ARRAY
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[CHAP. 2
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Since it is an object, an array can be duplicated by invoking the Object.clone() method, as shown in Example 2.2. EXAMPLE 2.2 Duplicating an Array
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public class DuplicatingArrays { public static void main(String[] args) { int[] a = {22, 44, 66, 88}; print(a); int[] b = (int[])a.clone(); // duplicate a[] in b[] print(b); String[] c = {"AB", "CD", "EF"}; print(c); String[] d = (String[])c.clone(); // duplicate c[] in d[] print(d); c[1] = "XYZ"; // change c[], but not d[] print(c); print(d); } public static void print(int[] a) { System.out.printf("{%d", a[0]); for (int i = 1; i < a.length; i++) { System.out.printf(", %d", a[i]); } System.out.println("}"); } public static void print(Object[] a) { System.out.printf("{%s", a[0]); for (int i = 1; i < a.length; i++) { System.out.printf(", %s", a[i]); } System.out.println("}"); } }
The output is:
{22, {22, {AB, {AB, {AB, {AB, 44, 66, 88} 44, 66, 88} CD, EF} CD, EF} XYZ, EF} CD, EF}
The array a[] contains four int elements. The array b[] is a duplicate of a[]. Similarly, the array d[] is a duplicate of the array c[], each containing three String elements. In both cases, the duplication is obtained by invoking the clone() method. Since it returns a reference to an Object, it must be cast to the array type being duplicated, int[] or String[]. The last part of the example shows that the cloned array d[] is indeed a separate copy of c[]: Changing c[1] to "XYZ" has no effect upon the value "CD" of d[1].
CHAP. 2]
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