Array Resize in Java

Creates a new array and reallocate an array with a new size, and copies the contents of the old array to the new array.

//  oldArray  is  the old array, to be reallocated.
// newSize is  the new array size.
// return   type is a new array with the same contents.

public Object resizeArray (Object oldArray, int newSize) {
   int oldSize = java.lang.reflect.Array.getLength(oldArray);
   Class elementType = oldArray.getClass().getComponentType();
   Object newArray = java.lang.reflect.Array.newInstance(
         elementType,newSize);
   int preserveLength = Math.min(oldSize,newSize);
   if (preserveLength > 0)
      System.arraycopy (oldArray,0,newArray,0,preserveLength);
   return newArray;
}