Expand String

 Write A Function

String expnadString(String x);

string x="1,2,3,6";

output : 1,2,3,4,5,6

x=1,....,4....,10

output:

1,2,3,4,5,6,7,8,9,10


public class ExpandMyString {

    public static void main(String[] args) {
        TestData obj = new TestData();
        String x = "1,2,3,15,......,20,....,30";
        System.out.println("out put=" + obj.expnadString(x));
    }

    public String expnadString(String x) {
        String[] namesOfArray = x.split(",");
        char[] arr = namesOfArray[namesOfArray.length - 1].toCharArray();
        int i = 0;
        int num = 0;
        int zeroAscii = (int) '0';
        while (i < arr.length) {
            int charAscii = (int) arr[i];
            num = num * 10 + (charAscii - zeroAscii);
            i++;
        }

        String y = "";
        for (int j = 1; j < num; j++) {
            y += j + ",";
        }
        y += num;

        return y;
    }

}

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