Merge array's in java?

[Reshma Shanbhag]

HI all,
I am stuck in a situation where i need to merge the contents of two long[].
Heres the example for my requirement

 long[] l1 = new long[]{1,2,3,4,5};
 long[] l2 = new long[]{6,7,8,9,10};
 
 long[] l3 = Contents Of l1+ l2 i.e l3= [1,2,3,4,5,6,7,8,9,10];

I know the routine way of running for loops to copy the contents from one array to other...
IS THERE ANY OTHER EFFICIENT WAY OF DOING THIS.
Regards
Reshma

[Carl Trusiak]

Believe it or not System has a method to help you with that. arraycopy (Yes, naming convention doesn't follow Sun's standard imagine that :roll: )

        long a1[] = new long[]{1, 2, 3, 4, 5};
        long a2[] = new long[]{6, 7, 8, 9, 10};
        long a3[] = new long[a1.length + a2.length];
        System.arraycopy(a1, 0, a3, 0, a1.length);
        System.arraycopy(a2, 0, a3, a1.length, a2.length);
        for(int j = 0; j < a3.length; j++) {
            System.out.println(a3[j]);
        }

:roll:
[ August 27, 2003: Message edited by: Carl Trusiak ]

[Chris Shepherd]

Check into System.arrayCopy()
You should be able to create a third array with a length equal to the sum of the other two. Then just use this method to place the elements from the first two into the third array.
hth
-EDIT----------------------------
DOH! Carl beat me to it...
---------------------------------
[ August 27, 2003: Message edited by: Chris Shepherd ]

[Reshma Shanbhag]

Hi Chris .
Thanks a ton for the help, it was extremely helpful to me. For a while i was in java.util park looking for this functionality :roll:
Reshma
[ August 27, 2003: Message edited by: Reshma Pai ]