Expanding an Array
The length of an array cannot be changed. The closest thing to expanding an array is to create a larger one of the same type and copy the contents from the old array. 

 Object newArray = Array.newInstance(
   array.getClass().getComponentType(), 
   Array.getLength(array)*2);
 System.arraycopy(array, 0, newArray, 
   0, Array.getLength(array));