String to Array Int

Question

Write a function which takes a number represented as a String as an argument, for example "12345" or "4321432143214321" and returns the digits of that number in an array.

Your function should create an int[] array with one digit of your number per element.

Can someone please a hint as how I can approach this problem?

second answer http://stackoverflow.com/questions/8391979/does-java-have-a-int-tryparse-that-doesnt-throw-an-exception-for-bad-data — caps lock, Feb 03 '16 at 01:44

score 1 · Answer 1 · answered Feb 03 '16 at 01:49

public int[] convertToArray(String str){
    int array[] = new int[str.length()];
    for(int i = 0; i < array.length; i++){
       try{
           array[i] = Integer.parseInt(str.substring(i,i+1));
       }catch(NumberFormatException e){
           e.printStackTrace();
           array[i] = 0;
       }
    }
    return array;
}

score 1 · Answer 2 · answered Feb 03 '16 at 11:38

1

Just for fun, a Java 8 solution:

int[] result = input.codePoints().map(Character::getNumericValue).toArray();

answered Feb 03 '16 at 11:38

Robert Bräutigam

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Tim Biegeleisen · Answer 3 · 2016-02-03T01:59:24.007

0

int[] getStringAsArray(String input) {
    int[] result = new int[input.length()];

    for (int i=0; i < input.length(); ++i) {
        result[i] = Character.getNumericValue(input.charAt(i));
    }

    return result;
}

Note that any character in the input string which is not a number will be converted to a negative value in the output int[] array, so your calling code should check for this.

edited Feb 03 '16 at 01:59

answered Feb 03 '16 at 01:45

Tim Biegeleisen

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String to Array Int

3 Answers3