final int MAX_SIZE = 50;
int capacityIncrement=0, capacity=MAX_SIZE;

double[] myArray = new double[MAX_SIZE];


if (capacityIncrement == 0) {
  capacity *= 2;
}
else {
  capacity += capacityIncrement;
}

// now create a new array using the updated 
// capacity value
double [] newArray = new double[capacity];

// copy the contents of the original array
// to the new array
for (int i = 0; i < myArray.length; i++) {
  newArray[i] = myArray[i];
} // end for

// now change the reference to the original array
// to the new array
myArray = newArray;