how can I pass the Reference of an arraylist to an array?

Question

I have an Arraylist but the method constraints that I should return an array and I should return an array with the same reference as the one given to me in the signature of the method, and I can not simply not use The ArrayList because that would require a lot of changes in the code. so is there a quick way to do it??

public Skill[] getSkills() {
  if (skills.size() == 0) {
    return null;
  }
  Skill[] result = new Skill[skills.size()];
  result = skills.toArray(result);
  return result;
}

public void setSkills(Skill[] skills) {
  if (skills.length != 0) {
    for (int i = 0; i < skills.length; i++) {
      this.skills.add(i, skills[i]);
    }
  }
}

the Junit test is:

@Test(timeout = 1000)
public void testGetSkills() {
  instance.setSkills(skills);
  assertSame("The returned skill array should be the same", instance.getSkills(), skills);
}

can you post some code of your problem? – benzonico Mar 08 '13 at 13:32 — benzonico, Mar 08 '13 at 13:32
Could you add what you have done? – Michaël Mar 08 '13 at 13:33 — Michaël, Mar 08 '13 at 13:33

score 2 · Answer 1 · answered Mar 08 '13 at 13:33

2

how can I pass the Reference of an arraylist to an array?

public T[] method() {
List<T> list=....; 
 //other ops
return list.toArray(new T[list.size()]);
}

List#toArray(T..a) method acts as bridge between array-based and collection-based APIs.

answered Mar 08 '13 at 13:33

PermGenError

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score 1 · Answer 2 · answered Mar 08 '13 at 13:49

1

consider Ur method have parameter as follows

public Array method (Array signature)
{
ArrayList<object> ArrayList = new ArrayList<object>();

foreach(object test in ArrayList )
{
 if(test == signature)
{
    return test
}  
}
}

Thanks

answered Mar 08 '13 at 13:49

Anand

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score 0 · Answer 3 · answered Mar 08 '13 at 13:33

0

I have an Arraylist but the method constraints that I should return an array

Can you not just do:

return list.toArray(new String[list.size()]);

Assuming your ArrayList is of Strings here of course - replace String with whatever type is relevant.

answered Mar 08 '13 at 13:33

Michael Berry

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score 0 · Answer 4 · answered Mar 08 '13 at 13:35

0

you can return list.toArray( [list.size()]);

answered Mar 08 '13 at 13:35

Civa

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how can I pass the Reference of an arraylist to an array?

4 Answers4