string .nextLine()

Question

so i'm having a bit of a problem with my code. suppose the output is:

aaaaabcc1111111111

xyz

abbbc

my code will only read the first line "aaaaabcc1111111111" and not the rest. i've been try to mess around with the for loops but i can't seem to put my finger on what to do. any help would be much appreciated!

 public class Compress {

    public static void main(String[] args) {
        java.util.Scanner in = new java.util.Scanner(System.in);
        String s = in.next();
        in.nextLine();
        String compressString = compress(s);
        System.out.println(compressString);

    }

    public static String compress (String text){

        String string = "";
        int count = 0;
        char currentChar = text.charAt(0);
        for(int i=0; i<text.length(); i++){
            if (currentChar == text.charAt(i)) {
                currentChar = text.charAt(i);
                count++;
            } else {
                if (count >= 3) {
                    if (Character.isDigit(currentChar)) {
                        //if character is a digit, print #c#n
                        string += "#" + count + "#" + currentChar;
                    } else {
                        //else it is then a letter, so print #cn
                        string += "#" + count + currentChar;
                    }
                } else if (count == 2) {
                    string += currentChar;
                    string += currentChar;
                } else if (count == 1) {
                    string += currentChar;
                }
                currentChar = text.charAt(i);
                count = 1;
            }
        }
        //if count is greater than 3
        if (count >= 3) {

            //if character is a digit, print #c#n
            if (Character.isDigit(currentChar)) {
                string += "#" + count + "#" + currentChar;
            } else {
                //else it IS then a letter, so print #cn
                string += "#" + count + currentChar;
            }
        } else if (count == 2) {
            string = string + currentChar;
            string = string + currentChar;
        } else if (count == 1) {
            string += currentChar;
        }
        return string;
    }
    }

You're reading 2 lines and ignoring the second. I'm not sure what you expected. — shmosel, Feb 26 '19 at 23:41
any suggestions? i made my code store the second line but now i get an Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: 0 – error — , Feb 27 '19 at 00:24

score 0 · Answer 1 · answered Feb 26 '19 at 23:47

0

Here's what your main method is doing, line-by-line:

String s = in.next();

Read the first line in and store it in s

in.nextLine();

Read the second line in and don't store it anywhere

String compressString = compress(s);

Compress the first line

System.out.println(compressString);

Print out the compressed first line

End without ever having read in the third line.

Hopefully that's enough to point you in the right direction.

answered Feb 26 '19 at 23:47

Jordan

2,168
7
15

hello, so i stored the second and third line and printed them...but now i get an error. Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: 0 – Feb 26 '19 at 23:59
Please update the code in your post with any changes that you made. – Jordan Feb 27 '19 at 00:39

string .nextLine()

1 Answers1