java 數組反射_java 數組反射例子

import java.lang.reflect.Array;

import java.util.Random;

public class ArrayCreate {

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

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

int value = Array.getInt(array, i);

System.out.println("Position: " + i +", value: " + value);

}

}

}