Shrinking an array in Java.

Hobbes

I have something like this...

String[] list = new String[100];

now I have it filled with data but I want to cull it do that they get an array back of x

eg.

String[] newList = myClass.getList(x); 

Do I have to create a new array and step through the other array copying? or is there a faster method?

String[] returnList = new String[x];
for (int i = 0; i < x; i++) { 
  returnList[i] = list[i];
}

return returnList;

Mixie

Not touched Java in a while, but try:

System.arraycopy(list, 0, newlist, 0, x);

public static void arraycopy(Object source, int sourcePosition,
Object destination, int destinationPosition, int numberOfElements)

Hobbes

Perfect! Cheers.

Mixie

No problem.

Depending on array content/size sometimes I've found for-loops to be faster than using .arraycopy or .clone - being punished for clean code annoys me :mad:

fatlog

i think you could also use vectors

madramor

fatlog wrote:

i think you could also use vectors

An ArrayList would be better
http://www.javaworld.com/javaworld/javaqa/2001-06/03-qa-0622-vector.html

fatlog

madramor wrote:

An ArrayList would be better
http://www.javaworld.com/javaworld/javaqa/2001-06/03-qa-0622-vector.html

good point