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javasplitint
E. Rose
E. Rose

Reputation: 53

Splitting a string to a list of integers in java

I want to split a string of form:

" 42 2152 12 3095 2"

into a list of integers, but when I use the .split(" ") function I end up with an empty "" element at the beginning due to the whitespace at the start. Is there a way to split this without the empty element?

Upvotes: 0

Views: 151

Answers (4)

Dharmesh Rupani
Dharmesh Rupani

Reputation: 1007

As per above answers and you are asking the performance difference between all these methods:

There is no real performance difference all of these would run with O(n).

Actually, splitting the strings first like , and then adding them to a collection will contain 2 x O(n) loops.

Upvotes: 1

Nirupa
Nirupa

Reputation: 787

You can use Scanner , it will read one integer at a time from string

Scanner scanner = new Scanner(number);
List<Integer> list = new ArrayList<Integer>();
while (scanner.hasNextInt()) {
    list.add(scanner.nextInt());
}

Upvotes: 1

Zain
Zain

Reputation: 469

Use the String.trim() function before you call split on the array. This will remove any white-spaces before and after your original string

For example:

    String original = " 42 2152 12 3095 2"; 
    original = original.trim();
    String[] array = original.split(" ");

To make your code neater, you could also write it as:

    String original = " 42 2152 12 3095 2"; 
    String[] array = original.trim().split(" ");

If we print the array out:

    for (String s : array) {
        System.out.println(s);
     }

The output is: 

42
2152
12
3095
2

Hope this helps.

Upvotes: 2

Sleiman Jneidi
Sleiman Jneidi

Reputation: 23329

You can use String.trim to remove leading and trailing whitespace from the original string

String withNoSpace = " 42 2152 12 3095 2".trim();

Upvotes: 2

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