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Java Collection Q&A » ArrayList » toArray

1. Typecast a ArrayList.toArray() in Java to normal array stackoverflow.com

I'm having some trouble to do the following:

int[] tmpIntList = (int[])MyArrayList.toArray(someValue);

MyArrayList contains only numbers. I get a typecast error since ArrayList only returns Object[] but why isnt it possible to turn ...

2. casting ArrayList.toArray() with ArrayList of Generic Arrays stackoverflow.com

A difficult question which I'm close to giving up all hope on. I'm trying to make a function, but am having problems getting ArrayList.toArray() to return the type I want. ...

3. make arrayList.toArray() return more specific types stackoverflow.com

so normally arrayList.toArray() would return a type of Object[]....but supposed it's an arraylist of object Custom, how do I make toArray() return a type of Custom[] rather than Object[]

4. Cast to an array of Message stackoverflow.com

Good Afternoon in my timezone. I have a "simple" question. I have an ArrayList , but when i transform this ArrayList to array using the method toArray from the ArrayList object and cast ...

5. ArrayList.toArray() not converting to the correct type? stackoverflow.com

So, what I got is:

class BlahBlah
{
    public BlahBlah()
    {
        things = new ArrayList<Thing>();
    }

  ...

6. using toArray with ArrayList of custom objects stackoverflow.com

Is there a way to use the toArray() method on an ArrayList<CustomObject>? From what I see, it can only be used with Object

7. ClassCastException with ArrayList.toArray() coderanch.com

8. Class Cast exception using ArrayList,toArray() coderanch.com

The method toArray() converts to the type Object[] and this cannot be cast down to String[]. You have to provide an argument to the method specifying the type such as toArray(new String[size]) where size can be specified as the same, smaller than or greater than depending on your needs From the API: array param - the array into which the elements ...

9. toArray function of ArrayList coderanch.com

I tried your code and it didn't compile - so can't explain how you get a null pointer exception Don't think (obj[]) a.toArray() makes sense - what do you expect it to do ? obj = a.toArray() works fine in code below (have replaced object with Strings just for simplicity in example) ArrayList a = new ArrayList(); a.add("obj1"); a.add("obj2"); a.add("obj3"); a.add("obj4"); ...

10. Problem with ArrayList toArray method coderanch.com

The types that the constructor expects were defined in the constructor, just shown. The types that were being passed in were revealed in the error message: CourseAdministration.java:127: cannot find symbol symbol : constructor Unit(java.lang.String,java.lang.String,courseType,Campus[]) This tells us it's looking for a Unit constructor that takes (String, String, courseType, Campus[]), but it can't find that combination. By the way, it's generally a ...

11. ArrayList.toArray([] a) Help forums.oracle.com

The variable name contacts just holds on to a reference which is immediately returned. It makes me want to scrutinize the lines more than I need to for side effects. The replacement is more straight forward. We are getting an array of the list's contents and nothing more. It doesn't work differently, it's just more concise.