Convert Object arrayList object to Integer

Question

I have created an ArrayList of Object and it contains both Integer and String.

List<Object> arrayList = new ArrayList<>();

Using the below condition I have checked whether it is integer or not

if(arrayList.get(indexValue) instanceof Integer){
 // Here how convert the object into integer
}

But the problem is, how can I convert the object into integer ?

Thanks

Since you are sure the object is of Integer type, you can simply Cast it! — Aditya Jain
– Aditya Jain, Commented Nov 1, 2012 at 5:30
Use Integer i = Integer.valueOf(someObject); docs.oracle.com/javase/6/docs/api/java/lang/… — Zak
– Zak, Commented Nov 1, 2012 at 5:59

Subhrajyoti Majumder · Accepted Answer · 2020-11-20 15:35:57Z

3

You can explicitly cast it to Integer but dont need Java does does it for you.

if(arrayList.get(indexValue) instanceof Integer){
  Integer i = arrayList.get(indexValue);
}

answered Nov 1, 2012 at 5:30

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3 Comments

you don't need to even do that. Java will box and unbox from Integer to int

If I want to convert array[0} to integer can I convert `(int)array[0}' like this ???

yes you can, But as @Tom suggested, it box automatically.