Copying Arrays Using arraycopy() method

In Java, the System class contains a method named arraycopy() to copy arrays. This method is a better approach to copy arrays than the above two. The arraycopy() method allows you to copy a specified portion of the source array to the destination array. For example,

$\begin{lstlisting} arraycopy(Object src, int srcPos,Object dest, int destPos, int length) \end{lstlisting}$

Here,

src - source array you want to copy
srcPos - starting position (index) in the source array
dest - destination array where elements will be copied from the source
destPos - starting position (index) in the destination array
length - number of elements to copy

Let's take an example:

$\begin{lstlisting} // To use Arrays.toString() method import java.util.Arrays; \... ...2); System.out.println(''n3 = '' + Arrays.toString(n3)); } } \end{lstlisting}$

Output for the above program can be

$\begin{lstlisting} n2 = [2, 3, 12, 4, 12, -2] n3 = [0, 12, 4, 0, 0] \end{lstlisting}$

In the above example, we have used the arraycopy() method,

System.arraycopy(n1, 0, n2, 0, n1.length) - entire elements from the n1 array are copied to n2 array
System.arraycopy(n1, 2, n3, 1, 2) - 2 elements of the n1 array starting from index 2 are copied to the index starting from 1 of the n3 array

As you can see, the default initial value of elements of an int type array is 0.