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import java.lang.reflect.Array;

import java.util.Arrays;

import java.util.Properties;

/**

* @author Syniuk Valentyn

*/

public class CreatorArrays {

public static void main(String[] args) {

int[] array = (int[]) createArray(int.class, 5);

for (int i = 0; i < array.length; i++)

array[i] = i;

System.out.println(toString(array));

array = (int[]) changeSizeArray(array, 10);

System.out.println(toString(array));

System.out.println("**********************");

int[][] matrix = (int[][]) createMatrix(int.class, 5);

for (int i = 0; i < matrix.length; i++)

matrix[i][i] = i;

System.out.println(Arrays.deepToString(matrix));

matrix = (int[][]) changeSizeMatrix(matrix, 6);

System.out.println(toString(matrix));

}

private static Object createArray(Class cls, int size) {

return Array.newInstance(cls, size);

}

private static Object createMatrix(Class cls, int size) {

return Array.newInstance(cls, size, size);

}

private static Object changeSizeArray(Object array, int size) {

Class cls = array.getClass();

Object newArray = Array.newInstance(cls.getComponentType(), size);

int oldSize = Array.getLength(array);

if (oldSize < size) size = oldSize;

System.arraycopy(array, 0, newArray, 0, size);

return newArray;

}

private static Object changeSizeMatrix(Object matrix, int size) {

Class cls = matrix.getClass();

Object newMatrix = createMatrix(cls.getComponentType().getComponentType(), size);

int oldSize = Array.getLength(matrix);

if (oldSize < size) {

for (int i = 0; i < oldSize; i++)

Array.set(newMatrix, i, changeSizeArray(Array.get(matrix, i), size));

for (int i = oldSize; i < size; i++)

Array.set(newMatrix, i, createArray(cls.getComponentType().getComponentType(), size));

} else {

for (int i = 0; i < size; i++)

Array.set(newMatrix, i, changeSizeArray(Array.get(matrix, i), size));

}

return newMatrix;

}

private static String toString(Object array) {

StringBuilder builder = new StringBuilder();

Class cls = array.getClass();

if (!cls.isArray()) {

builder.append(array.toString());

} else {

int length = Array.getLength(array);

for (int i = 0; i < length; i++) {

if (i == 0) builder.append("[");

Object value = Array.get(array, i);

builder.append(toString(value));

if (i != length - 1) {

builder.append(", ");

} else builder.append("]");

}

}

return builder.toString();

}

}