Difference between various Array copy methods

There are answers but not a complete one.

The options considered are

• Arrays.copyOf()
• System.arraycopy()

Below is the java implementation of Arrays.copyOf()

public static double[] More ...copyOf(double[] original, int newLength) {
        double[] copy = new double[newLength];
        System.arraycopy(original, 0, copy, 0,
                         Math.min(original.length, newLength));
        return copy;
   }

As you can see copyOf uses System.arraycopy internally.

• If you already have an array created use System.arraycopy() to copy
• If you need the result in a new array use Arrays.copyOf() to copy

Note: There is no point in comparing the speed obviously because their functionalities differ.