import java.lang.reflect.Array;
public class Main {
public static Object copyArray(final Object input) {
final Class type = input.getClass();
if (!type.isArray()) {
throw new IllegalArgumentException();
}
final int length = Array.getLength(input);
final Class componentType = type.getComponentType();
final Object result = Array.newInstance(componentType, length);
for (int idx = 0; idx < length; idx++) {
Array.set(result, idx, Array.get(input, idx));
}
return result;
}
public static void main(final String[] args) {
try {
int[] x = new int[] { 2, 3, 8, 7, 5 };
char[] y = new char[] { 'a', 'z', 'e' };
String[] z = new String[] { "Jim", "John", "Joe" };
System.out.println(" -- z and copy of z --");
outputArrays(z, copyArray(z));
} catch (final Exception ex) {
ex.printStackTrace();
}
}
public static void outputArrays(final Object first, final Object second) {
if (!first.getClass().isArray()) {
throw new IllegalArgumentException("first is not an array.");
}
if (!second.getClass().isArray()) {
throw new IllegalArgumentException("second is not an array.");
}
final int lengthFirst = Array.getLength(first);
final int lengthSecond = Array.getLength(second);
final int length = Math.max(lengthFirst, lengthSecond);
for (int idx = 0; idx < length; idx++) {
System.out.print("[" + idx + "]\t");
if (idx < lengthFirst) {
System.out.print(Array.get(first, idx) + "\t\t");
} else {
System.out.print("\t\t");
}
if (idx < lengthSecond) {
System.out.print(Array.get(second, idx) + "\t");
}
System.out.println();
}
}
}
|
