Get array item from arraylist

Question

I am modifying my question to make it more understandable. I have the following arraylist

ArrayList<AnotherClass> exmapleName = new ArrayList<AnotherClass>();
// AnotherClass is a class I created, I store objects of the class in this array, the code to this doesn't matter this works.

Inside of exampleName I have different types of data

public AnotherClass (String someString,  int someInt, int anotherInt, int[] intArray, ArrayList<Integer> arrayList)
//Header of the constructor

Now what I need to do is access and store arrayList[0]. But I need to do it once the object has been created so there is actually something inside arrayList.

This is what I've tried but doesn't seem to work

         AnotherClass test1 = exampleName.get(1);
        ArrayList<Integer> test2 = test1.arrayList;
        int test3 = test2.arrayList[0];
// I broke it down into separate lines to make it more understandable

compiler errors are as follows

cannot find symbol
                    int test3 = test2.arrayList[0];
symbol:   variable arrayList
location: variable test2 of type ArrayList<Integer>

1 error

You have an ArrayList of int[]? It is this data your type.@Blueaddiction — Murali krishna
– Murali krishna, Commented Dec 24, 2015 at 6:59

Sarath Chandra · Accepted Answer · 2015-12-24 07:05:25Z

2

If you're having a "normal" array, you can simply access the i-th element, with the index, as myArrayList.get(1).normalArray[i].

If you need to process the array, consider storing it into a local copy and access from it.

int[] numbers = myArrayList.get(1);
for(Integer num : numbers){
  // Process the numbers array.
  System.out.print(num);
}

edited Dec 24, 2015 at 7:05

answered Dec 24, 2015 at 6:52

Sarath Chandra

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4 Comments

Blueaddiction Over a year ago

I have tried this before but, I need to store the variable as an int but it requires an integer array R.java:70: error: array required, but ArrayList<Integer> found

ajb Over a year ago

@Blueaddiction So you're saying that normalArray is declared as an ArrayList<Integer>? You didn't say that in your original post. You said "int array" which everybody else has misinterpreted. Please show us more of the code.

Blueaddiction Over a year ago

I said the main array is an integer arraylist which inside has an int array. I'll post some more code when I go back to it taking a break

Blueaddiction Over a year ago

I've modified the main post to reflect the problem more clearly

Bharat DEVre · Accepted Answer · 2015-12-24 06:55:00Z

0

 int arr[] = myArrayList.get(1);

access like,

int first=arr[0];

answered Dec 24, 2015 at 6:55

Bharat DEVre

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2 Comments

Blueaddiction Over a year ago

actually wait it didnt work, error: incompatible types: //my other class -->(anotherClass) cannot be converted to int[] int[] test1 = eQuestion.get(1);

Bharat DEVre Over a year ago

can you please post some more code so that I can figure out if its still not working for you.

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