Get array length using reflection method : Array Reflection Utilities « Collections « Java Tutorial

1. Java Tutorial
2. Collections
3. Array Reflection Utilities

import java.lang.reflect.Array;

public class MainClass {
  public static void main (String args[]) {
    int[] array = (int[])Array.newInstance(int.class, 3);

    for(int i=0;i<array.length;i++){
      array[i] = i;
      
    }    
    
    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);
    }
  }
}

Position: 0, value: 0
Position: 1, value: 1
Position: 2, value: 2