Split string array to int array

Question

I want to convert array of strings, for example

str1[][] ={{"1,2,3,4","0","2,1"}};

to int array like that:

int arr[][]={{1,2,3,4},{0,0,0,0},{2,1,0,0}}

Im not able to use just split method, because the size of the tempString changes after every iteration.

My code:

int numOfelements = 3;

        String str1[][] = { { "1,2,3,4", "0", "2,1" } };
        int graph[][] = new int[numOfelements][numOfelements];
        String str[]= new String[numOfelements];


            for (int i = 0; i < numOfelements; ++i) {
                str = str1[i][0].split(",");
                for (int j = 0; j < numOfelements; ++j) {
                    try {
                        if (str.length < j)
                            graph[i][j] = Integer.parseInt(str[i]);
                        else
                            graph[i][j] = 0;
                    } catch (Exception e) {
                        JOptionPane.showMessageDialog(new JFrame(), "Error in the data!",
                                "Error", JOptionPane.ERROR_MESSAGE);
                        break;
                    }
                }
            }

I think, instead of str = str1[i][0].split(","); you should switch the indices by using str = str1[0][i].split(","); — Benjamin Lücking
– Benjamin Lücking, Commented Mar 15, 2016 at 22:15
Is string like "1,2,3,4,5" possible? If so it be converted to {1,2,3,4} or {1,2,3,4,5}? — Pshemo
– Pshemo, Commented Mar 15, 2016 at 22:27

user3437460 · Accepted Answer · 2016-03-15 22:15:42Z

1

You may write a customized method to fill the array with zeroes. .split() still can be used if you use it cautiously.

public static int[] fillArray(String s, int size){
    String[] tok = str.split(",");
    int[] newArr = new int[size];

    for(int x=0; x<Math.min(size, tok.length); x++)
        newArr[x] = Integer.parseInt(tok[x]);

    for(int x=Math.min(size, tok.length); x<Math.max(size, tok.length); x++)
        newArr[x] = 0;

    return newArr;
}

Get the array data and fill it with zeroes and put it back in a new array:

int[][] arr;
for(int x=0; x<str1[0].length; x++)
    arr[0][x] = fillArray(str1[0][x], 4);  //size of 4 can be changed to your needs

answered Mar 15, 2016 at 22:15

user3437460

17.5k18 gold badges67 silver badges110 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Expiredmind Over a year ago

I must modify your solution a little but it gives me good clue, thanks!

kedar kamthe · Accepted Answer · 2016-03-16 10:20:56Z

0

try this solution :

int numOfelements = 4;
        String str1[][] = { { "1,2,3,4", "0", "2,1" }};
        int graph[][] = new int[numOfelements][numOfelements];
        String str[]= new String[numOfelements];

        for (int k = 0; k < str1.length; k++) {
            int len =str1[k].length;    
            for (int i = 0; i < len; i++) {
                str = str1[k][i].split(",");    
                for(int j = 0; j < str.length; j++ )
                    graph[i][j]=Integer.parseInt(str[j]);
            }
        }

answered Mar 16, 2016 at 10:20

kedar kamthe

8,20811 gold badges38 silver badges46 bronze badges

Collectives™ on Stack Overflow

Split string array to int array

2 Answers 2

1 Comment

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

1 Comment

Comments

Your Answer

Sign up or log in

Post as a guest

Related