array data type conversion

[ElderGeek]

I have a float[] array, which I need to convert to a Double[] array. The task does not seem as trivial as I expected it to be. Can anyone give me some guidance?

[JosAH]

@ElderGeek
You have to do it element by element and store the new elements in your new array. e.g.

Double[] convert(float[] f) {
 
   Double[] d= new Double[f.length];
   for (int i= 0; i < f.length; i++)
      d[i]= new Double(f); // convert any way you like
   return d;
}
 

Arrays of type D can't be cast to an array of type B, not even when type D extends type B (a D 'is a' B). Here is a small example that shows why you can't do it:

public class Animal { ... }
public class Poodle extends Animal { ... }
public class Lion extends Animal { ... }
 
Poodle[] poodles = { /* cute little poodles in here */ };
Animal[] animals= (Animal[])poodles; // this is not allowed because:
animals[0]= new Lion(); // the poodles won't survive ;-)
 

kind regards,

Jos

[ElderGeek]

Nice and concise -- thanks!