how do I concatenate two lines dynamically using java?

Question

How do I concatenate two lines dynamically using java?

String s = "HackerRank ";
Scanner scan = new Scanner(System.in);
//Scanner scan = new Scanner(System.in);
String s2 = scan.nextLine();
//concatenates both the strings        
s = s+s2;
// s = s.concat(s2);
System.out.println(s);
scan.close();

The output should concatenate two complete lines. for ex. if
String s = "Hackerank" and String s1 = "is very good to learn coding",
The output should be like:

Hackerank is very good to learn coding

Your concatenation looks correct. Have you tested this code? — Tim Biegeleisen, Jan 06 '17 at 07:05
Possible duplicate of [How do I concatenate two strings in Java?](http://stackoverflow.com/questions/3753869/how-do-i-concatenate-two-strings-in-java) — Azodious, Jan 06 '17 at 07:05
It's unclear what you're asking. The code you posted does the concatenation. Are you getting an unexpected result? If so, what? — Ted Hopp, Jan 06 '17 at 07:10
@TedHopp I had to execute the aforementioned code online on a website called Hackerrank. The output didn't turnout the way I expected. Expected output: Hackerrank is very good to learn coding. My output: Hackerrank — Liswin, Jan 06 '17 at 09:35
If that was your output, then you weren't running the code you posted here. — Ted Hopp, Jan 06 '17 at 16:19

score 1 · Answer 1 · edited Jan 06 '17 at 08:46

1

I've tried your code and it works perfectly may be you don't know how to use it. There is no need to concatenate with blank space first as the previous answer says. Just keep doing as you did it work, look at the screenshot: here is the result I got when I ran you code

with this code

import java.util.Scanner;
public class test {
    public static void main(String[] args) {
        String s = "HackerRank "; //Scanner scan = new Scanner(System.in);
        try (Scanner scan = new Scanner(System.in)) {
            //Scanner scan = new Scanner(System.in);
            String s2 = scan.nextLine(); //concatenates both the strings
            s = s + s2; // s = s.concat(s2);
            System.out.println(s);
        }
    }
}

edited Jan 06 '17 at 08:46

Mark Rotteveel

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answered Jan 06 '17 at 08:08

Vivien SA'A

727
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Please don't post images when text will do just fine. – Mark Rotteveel Jan 06 '17 at 08:16
A `BufferedReader` would also work (see http://docs.oracle.com/javase/7/docs/api/java/io/BufferedReader.html#readLine() ) – NoDataFound Jan 06 '17 at 08:45
I executed the same code online via Hackerrank. It didn't work there. – Liswin Jan 06 '17 at 09:20
I've never use Hackerrank. I just intallalled JDK and that's all – Vivien SA'A Jan 06 '17 at 09:24

score -1 · Answer 2 · answered Jan 06 '17 at 08:00

-1

I don't see anything wrong with the code. The strings will be concatenated. But the output will be

Hackerankis very good to learn coding.

if you want the output to be as you described you should concatenate a white space like

s = s + " " + s2;

answered Jan 06 '17 at 08:00

Suresh karki

69
7

There already is a space in string `s`, so this is entirely unnecessary. – Mark Rotteveel Jan 06 '17 at 08:17

how do I concatenate two lines dynamically using java?

2 Answers2