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в 17:44, 31 мая 2010

2010-05-31T17:44:27Z

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== Array Of int Arrays ==



<source lang="java">
/*
* Copyright (c) 1995 - 2008 Sun Microsystems, Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* - Neither the name of Sun Microsystems nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
public class ArrayOfArraysDemo2 {
public static void main(String[] args) {
int[][] aMatrix = new int[4][];
// populate matrix
for (int i = 0; i < aMatrix.length; i++) {
aMatrix[i] = new int[5]; // create sub-array
for (int j = 0; j < aMatrix[i].length; j++) {
aMatrix[i][j] = i + j;
}
}
// print matrix
for (int i = 0; i < aMatrix.length; i++) {
for (int j = 0; j < aMatrix[i].length; j++) {
System.out.print(aMatrix[i][j] + " ");
}
System.out.println();
}
}
}</source>



== Array Of string Arrays ==



<source lang="java">
/*
* Copyright (c) 1995 - 2008 Sun Microsystems, Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* - Neither the name of Sun Microsystems nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
public class ArrayOfArraysDemo {
public static void main(String[] args) {
String[][] cartoons = {
{ "Flintstones", "Fred", "Wilma", "Pebbles", "Dino" },
{ "Rubbles", "Barney", "Betty", "Bam Bam" },
{ "Jetsons", "George", "Jane", "Elroy", "Judy", "Rosie", "Astro" },
{ "Scooby Doo Gang", "Scooby Doo", "Shaggy", "Velma", "Fred", "Daphne" } };
for (int i = 0; i < cartoons.length; i++) {
System.out.print(cartoons[i][0] + ": ");
for (int j = 1; j < cartoons[i].length; j++) {
System.out.print(cartoons[i][j] + " ");
}
System.out.println();
}
}
}</source>



== Arrays of Arrays ==



<source lang="java">
public class MainClass public class MainClass {
public static void main(String[] args) {
float[][] t = new float[10][365]; // Temperature array
for (int i = 0; i < t.length; i++) {
for (int j = 0; j < t[i].length; j++) {
t[i][j] = (float) (45.0 * Math.random() - 10.0);
}
}
float average = 0.0f;
for (int i = 0; i < t.length; i++) {
for (int j = 0; j < t[i].length; j++) {
average += t[i][j];
}
}
System.out.println(average);
}
}</source>



<pre class=codeResult>44505.707</pre>

== Arrays of Arrays in Varying Length ==



<source lang="java">
public class MainClass {
public static void main(String[] arg) {
float[][] samples = new float[6][]; // Define 6 elements,
// each is an array
for (int i = 0; i < samples.length; i++) {
samples[i] = new float[i + 1]; // Allocate each array
}

for (int i = 0; i < samples.length; i++) {
System.out.println(samples[i].length);
}

}
}</source>



<pre class=codeResult>1
2
3
4
5
6</pre>

== Defining Multidimensional Arrays ==



<source lang="java">
public class MainClass {
public static void main(String[] arg) {
long[][][] beans = new long[5][10][30];
for (int i = 0; i < beans.length; i++) {
for (int j = 0; j < beans[i].length; j++) {
beans[i][j] = new long[(int) (1.0 + 6.0 * Math.random())];
}
}
}
}</source>



== Get array upperbound ==



<source lang="java">
public class Main {
public static void main(String args[]) {
String[][] data = new String[3][4];
System.out.println("Dimension 1: " + data.length);
System.out.println("Dimension 2: " + data[0].length);
}
}
/*
Dimension 1: 3
Dimension 2: 4
*/</source>



== Initialize a two-dimensional array in matrix ==



<source lang="java">
public class MainClass {
public static void main(String args[]) {
double m[][] = {
{ 0*0, 1*0, 2*0, 3*0 },
{ 0*1, 1*1, 2*1, 3*1 },
{ 0*2, 1*2, 2*2, 3*2 },
{ 0*3, 1*3, 2*3, 3*3 }
};
int i, j;

for(i=0; i<4; i++) {
for(j=0; j<4; j++)
System.out.print(m[i][j] + " ");
System.out.println();
}
}
}</source>



<pre class=codeResult>0.0 0.0 0.0 0.0
0.0 1.0 2.0 3.0
0.0 2.0 4.0 6.0
0.0 3.0 6.0 9.0</pre>

== To get the number of dimensions ==



<source lang="java">
public class Main {
public static void main(String args[]) {
String[][] data = new String[3][4];
System.out.println(getDimension(data));
}
public static int getDimension(Object array) {
int dim = 0;
Class c = array.getClass();
while (c.isArray()) {
c = c.getComponentType();
dim++;
}
return (dim);
}
}
//2</source>

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Admin: 1 версия

в 17:44, 31 мая 2010