Iterate over String Arrays inside ArrayList

Question

I'm trying to iterate over string arrays inside a ArrayList. How is this possible?

public ArrayList<String[]> arrayList = new ArrayList<String[]>();

// [ [12, "Something"], [6, "Thing"], [3, "Cookies"] ]

public void getText(final List arrayList) {
  for (String[] array : arrayList) {
    Log.d("Text", array[1]);
  }
}

Error (line 4)

Required: String[]
Found: Object

`Log.d("Text", array);` gives you a `String[]`, while your `Log.d("Text", array[1]);` gives you a `String` — Pphoenix, Aug 25 '14 at 08:33
@Pphoenix It's the same thing I wrote, what are you talking about? — Kenny, Aug 25 '14 at 08:36
You have something in angle brackets on your `ArrayList`, what does it do? Why are there no angle brackets on the `List` in the method signature? — Boris the Spider, Aug 25 '14 at 08:38
In short - read [this](http://stackoverflow.com/a/2770692/2071828). — Boris the Spider, Aug 25 '14 at 08:40

score 1 · Accepted Answer · edited May 23 '17 at 11:49

1

You did not specified the actual type of data which your List into getText method is going to take. You need to replace final List arrayList with final List<String[]> arrayList into getText()

public void getText(final List<String[]> arrayList) {
  for (String[] array : arrayList) {
    Log.d("Text", array[1]);
  }
}

You should read What is a raw type and why shouldn't we use it?.

edited May 23 '17 at 11:49

Community

1
1

answered Aug 25 '14 at 08:34

Pankaj Kumar

81,967
29
167
186

While correct, code only answers are discouraged - and you should know that. Please add an explanation of what the problem was and how you have fixed it. – Boris the Spider Aug 25 '14 at 08:36
@PankajKumar Thank you so much! I'm gonna make this answer correct when the time expires. You are a hero! – Kenny Aug 25 '14 at 08:39

score 0 · Answer 2 · answered Aug 25 '14 at 08:37

0

It looks like maybe you are trying to use an ArrayList when just a good old String Array by itself will do the trick. I certainly understand ArrayLists are great tools, but it seems unnecessary here without more context.

Just iterate over the String array as follows:

String[] array = yourInputSourceHere;

for( int i = 0 ; i < array.length; i++ ) {
     Log.d("Text", array[i]);
}

answered Aug 25 '14 at 08:37

Dominic Holt

162
1
12

I'm using ArrayList because their size isn't fixed. Thanks anyways. – Kenny Aug 25 '14 at 08:40

score 0 · Answer 3 · answered Aug 25 '14 at 09:01

0

To Make use of For each loop do the following

for (String array:arraylist)

{
// use Array as one String object
System.out.println(array);
}

answered Aug 25 '14 at 09:01

Muneeb Tariq

35
7

Iterate over String Arrays inside ArrayList

3 Answers3