How do i get the elements form an Object array to a String array?

Question

I get a coding error in eclips Type mismatch, cannot convert Object to String. All data going into AL is String Type and AL is declared as String.
If i can just have AL go to a String[] that would be better. heres my code:

Object[] Result;
AL.toArray (Result);
String[] news= new String[Result.length];
for (int i1=0;i1<news.length;i1++){
    news[i1]=Result[i1]; <=====here is where the error shows up

That's what goes in, but how is AL declared? Is it a List<String>, List<Object>, or something else? — Ted Hopp
– Ted Hopp, Commented Jun 12, 2013 at 6:00
Um, how can AL be declared as a String when it has a toArray method? — Ted Hopp
– Ted Hopp, Commented Jun 12, 2013 at 6:17

mcalex · Accepted Answer · 2013-06-12 05:53:47Z

1

Change this:

 news[i1]=Result[i1];

to this:

 news[i1]=Result[i1].toString();

answered Jun 12, 2013 at 5:53

mcalex

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wns349 · Accepted Answer · 2013-06-12 05:54:43Z

1

Try type casting.

news[i1] = (String) Result[i1];

However, it is probably a good idea to check the type of Result[i1] before type casting like that. So you could do something like

if( Result[i1] instanceof String){
 news[i1] = (String) Result[i1];
}

If you are absolutely sure that every object in Result array is String type, why don't you use String[] in the first place? Personally, I'm not a big fan of Object[]...

answered Jun 12, 2013 at 5:54

wns349

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shreyansh jogi · Accepted Answer · 2013-06-12 05:55:42Z

0

String[] stringArray = Arrays.copyOf(objectArray, objectArray.length, String[].class);

answered Jun 12, 2013 at 5:55

shreyansh jogi

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1 Comment

Ted Hopp Over a year ago

This will throw an ArrayStoreException unless all the elements of objectArray are already instances of String.

ldam · Accepted Answer · 2013-06-12 06:01:12Z

0

You can supply the ArrayList.toArray() method with an existing array to define what type of array you want to get out of it.

So, you could do something like this:

String[] emptyArray = new String[0];
String[] news = AL.toArray(emptyArray);

answered Jun 12, 2013 at 6:01

ldam

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Ehab Mo. · Accepted Answer · 2013-06-12 08:46:33Z

0

Try this code:

public static void main(String[] args)
{
    Object[] Result = {"a1","a2","a3"};

    String[] AL = new String[Result.length];

    for(int a=0; a<Result.length; a++)
    {
        AL[a] = Result[a].toString();
    }

    System.out.println(AL[0]);
    System.out.println(AL[1]);
    System.out.println(AL[2]);
}

answered Jun 12, 2013 at 8:46

Ehab Mo.

1

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Ted Hopp · Accepted Answer · 2013-06-12 13:44:00Z

0

Since AL is, as you report, an ArrayList<String>, this should do what you want in one line of code:

String[] news = AL.toArray(new String[AL.size()]);

answered Jun 12, 2013 at 13:44

Ted Hopp

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