How to copy values of an array into another array

http://www.itcsolutions.eu/2010/12/29/tutorial-java-6-4-2-how-to-copy-values-of-an-array-into-another-array/

Based on this assumption, it is important to understand that the elements of an array are not copied like this:

         //initial array
        int[] oldArray = {1,2,3,4,5};
        //new array
        int[] newArray;
 
        //shallow copy - copy reference values
        newArray = oldArray;
 
        //print a value using seconf reference
        //prints value 3
        System.out.println(newArray[2]);

In Java there are two possibilities to copy values from an array to another:

1. an own implementation of an copying algorithm;
2. use of API functions.

For the first approach, the copy means to:

1. define a new vector;
2. allocate space for the new array;
3. copy values from the initial array:

          //initial array
        int[] oldArray = {1,2,3,4,5};
        //define a new array + allocate space
        int[] newArray = new int[oldArray.length];
 
        //copy values
        for(int i =0;i < oldArray.length;i++)
            newArray[i] = oldArray[i];

The second solution is based on the use of arraycopy function from the System library:

System.arraycopy( source, sourceStart, destination, destStart, length );