Reflections and Arrays

By using java.lang.reflect.Array class, you can create and access arrays.

Creating Arrays

Array class provides newInstance method to create single and multi dimensional arrays.

public static Object newInstance(Class<?> componentType, int length)

public static Object newInstance(Class<?> componentType, int... dimensions)

Example

int[] arr1 = (int[])Array.newInstance(int.class, 10);

int[][] arr2 = (int[][])Array.newInstance(int.class, 5,5);

Assign values to Array

Array class provides set method, to set values to array.

public static native void set(Object array, int index, Object value)

Get the Values of Array

Array class provide 'get' method to get the elements of an array.

public static native Object get(Object array, int index)

import java.lang.reflect.Array;

public class CreateArray {
    public static void main(String args[]){
        int[] arr1 = (int[])Array.newInstance(int.class, 10);
        
        for(int i=0; i<10; i++)
            Array.set(arr1, i, i);
        
        for(int i=0; i<10; i++)
            System.out.println(Array.get(arr1, i));
    }
}

Output

0
1
2
3
4
5
6
7
8
9

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