Convert String to int array in java

Question

I have one string:

String arr = "[1,2]";

ie "[1,2]" is like a single String.

How do I convert this arr to int array in java?

Answer 1

String arr = "[1,2]"; String[] items = arr.replaceAll("\\[", "").replaceAll("\\]", "").replaceAll("\\s", "").split(",");  int[] results = new int[items.length];  for (int i = 0; i < items.length; i++) {     try {         results[i] = Integer.parseInt(items[i]);     } catch (NumberFormatException nfe) {         //NOTE: write something here if you need to recover from formatting errors     }; } 

Answer 2

Using Java 8's stream library, we can make this a one-liner (albeit a long line):

String str = "[1, 2, 3, 4, 5, 6, 7, 8, 9, 0]";
int[] arr = Arrays.stream(str.substring(1, str.length()-1).split(","))
    .map(String::trim).mapToInt(Integer::parseInt).toArray();
System.out.println(Arrays.toString(arr));

substring removes the brackets, split separates the array elements, trim removes any whitespace around the number, parseInt parses each number, and we dump the result in an array. I've included trim to make this the inverse of Arrays.toString(int[]), but this will also parse strings without whitespace, as in the question. If you only needed to parse strings from Arrays.toString, you could omit trim and use split(", ") (note the space).

Answer 3

    final String[] strings = {"1", "2"};
    final int[] ints = new int[strings.length];
    for (int i=0; i < strings.length; i++) {
        ints[i] = Integer.parseInt(strings[i]);
    }

Answer 4

Saul's answer can be better implemented splitting the string like this:

string = string.replaceAll("[\\p{Z}\\s]+", "");
String[] array = string.substring(1, string.length() - 1).split(",");

Answer 5

It looks like JSON - it might be overkill, depending on the situation, but you could consider using a JSON library (e.g. http://json.org/java/) to parse it:

    String arr = "[1,2]";

    JSONArray jsonArray = (JSONArray) new JSONObject(new JSONTokener("{data:"+arr+"}")).get("data");

    int[] outArr = new int[jsonArray.length()]; 

    for(int i=0; i<jsonArray.length(); i++) {
        outArr[i] = jsonArray.getInt(i);
    }

Answer 6

try this one, it might be helpful for you

String arr= "[1,2]";
int[] arr=Stream.of(str.replaceAll("[\\[\\]\\, ]", "").split("")).mapToInt(Integer::parseInt).toArray();