Using reflection to create, fill, and display an array
import java.lang.reflect.Array;
import java.util.Random;
public class MainClass {
public static void main(String args[]) {
Object array = Array.newInstance(int.class, 3);
printType(array);
fillArray(array);
displayArray(array);
}
private static void printType(Object object) {
Class type = object.getClass();
if (type.isArray()) {
Class elementType = type.getComponentType();
System.out.println("Array of: " + elementType);
System.out.println("Array size: " + Array.getLength(object));
}
}
private static void fillArray(Object array) {
int length = Array.getLength(array);
Random generator = new Random(System.currentTimeMillis());
for (int i = 0; i < length; i++) {
int random = generator.nextInt();
Array.setInt(array, i, random);
}
}
private static void displayArray(Object array) {
int length = Array.getLength(array);
for (int i = 0; i < length; i++) {
int value = Array.getInt(array, i);
System.out.println("Position: " + i + ", value: " + value);
}
}
}
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