Re: Adding arrays to arrays...
Andreas Leitgeb wrote:
Suppose, you've got two arrays oa1 and oa2, that you want to join:
Object oa1[]=..., oa2[]=..., oa3[];
Then, first you use: oa3=Arrays.copyOf(oa1,oa1.length+oa2.length);
to get a new array large enough to hold both original arrays,
and already filled with oa1's elements, and then you use:
System.arraycopy(oa2, 0, oa3, oa1.length, oa2.length);
and voila, oa3 contains oa1 and oa2 concatenated.
That's kind of a cool idea. I don't see a concatenate method in Arrays
or System. Joshua Bloch recommends making a utility class to add a few
"missing" generic methods for Collections. The same could be done for
Arrays.
package cljprogrammer;
public class CollectionsUtils {
public static <T> T[] concat( T[] a1, T[] a2 )
{
T[] t = java.util.Arrays.copyOf( a1, a1.length+a2.length );
System.arraycopy(a2, 0, t, a1.length, a2.length);
return t;
}
}
Of course now you need to code up all the primitives too....
jff (just for fun...)
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