How to convert the numeric comma separated string into int array

Question

    //convert the comma separated numeric string into the  array of int. 
    public class HelloWorld
    {
      public static void main(String[] args)
      {
       // line is the input  which have the comma separated number
        String line = "1,2,3,1,2,2,1,2,3,";
       // 1 > split   
         String[] inputNumber =  line.split(",");
       // 1.1 > declare int array
         int number []= new int[10];
       // 2 > convert the String into  int  and save it in int array.
         for(int i=0; i<inputNumber.length;i++){
               number[i]=Integer.parseInt(inputNumber[i]);
         }
    }
}

Is it their any better solution of doing it. please suggest or it is the only best solution of doing it.

My main aim of this question is to find the best solution.

Note: this question has been cross-posted on Code Review. (That's OK, but please declare cross-posts as a courtesy to other users.) — 200_success
– 200_success, Commented Mar 8, 2016 at 19:23

MartinS · Accepted Answer · 2016-03-03 06:58:39Z

16

Java 8 streams offer a nice and clean solution:

String line = "1,2,3,1,2,2,1,2,3,";
int[] numbers = Arrays.stream(line.split(",")).mapToInt(Integer::parseInt).toArray();

Edit: Since you asked for Java 7 - what you do is already pretty good, I changed just one detail. You should initialize the array with inputNumber.length so your code does not break if the input String changes.

Edit2: I also changed the naming a bit to make the code clearer.

String line = "1,2,3,1,2,2,1,2,3,";
String[] tokens = line.split(",");
int[] numbers = new int[tokens.length];
for (int i = 0; i < tokens.length; i++) {
    numbers[i] = Integer.parseInt(tokens[i]);
}

edited Mar 3, 2016 at 6:58

answered Mar 3, 2016 at 6:53

MartinS

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2 Comments

Prabhat Yadav Over a year ago

Thanks I did not about java 8, Any solution related to java 7.

MartinS Over a year ago

@PrabhatYadav I edited my solution but what you had is already pretty much the best you can do in Java 7

user3437460 · Accepted Answer · 2016-03-03 06:57:55Z

2

By doing it in Java 7, you can get the String array first, then convert it to int array:

String[] tokens = line.split(",");
int[] nums = new int[tokens.length];

for(int x=0; x<tokens.length; x++)
    nums[x] = Integer.parseInt(tokens[x]);

answered Mar 3, 2016 at 6:57

user3437460

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1 Comment

shmosel Over a year ago

Hmm yes quite an innovative solution

shmosel · Accepted Answer · 2016-03-03 07:18:02Z

1

Since you don't like Java 8, here is the Best™ solution using some Guava utilities:

int[] numbers = Ints.toArray(
        Lists.transform(
                Splitter.on(',')
                        .omitEmptyStrings()
                        .splitToList("1,2,3,1,2,2,1,2,3,"),
                Ints.stringConverter()));

answered Mar 3, 2016 at 7:18

shmosel

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