Concat() in Java

Question

I've been trying this program. But I'm not getting the required output.

import java.util.*;

class MiscTest {

    public static void main(String[] args) {

        int i = 10;
        double d = 4.0;
        String s = "Lavante ";

        Scanner scanner = new Scanner(System.in);

        int j;
        double dd;
        String ss;

        j = scanner.nextInt();
        dd = scanner.nextDouble();
        ss = scanner.next();

        System.out.println("\n" + (i + j));
        System.out.println(d + dd);
        System.out.println(s.concat(ss));

    }
}

The input I've given:

The Output I got:

I need the whole sentence "Lavante is from Maserati" as output. But, I'm getting only one word from the Second String. Help me. Thanks in advance.

Stop posting screenshots of code. Making a screenshot is harder than just copying and pasting of text. — Stefan van den Akker, Jul 02 '16 at 09:05

Yassin Hajaj · Answer 1 · 2016-07-02T09:05:16.357

3

You need to use nextLine() otherwise, Scanner stops at the whitespace delimiter using next()

Also, after having used scanner.nextDouble(), use scanner.next() to consume the rest of the characters not read by the previous call, just like below.

dd = scanner.nextDouble();
scanner.next();
ss = scanner.nextLine();

edited Jul 02 '16 at 09:05

answered Jul 02 '16 at 08:50

Yassin Hajaj

21,337
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If I use nextLine(), It's not letting me to enter the second string. I could enter only int and double. – Dheeraj Vuppuluri Jul 02 '16 at 08:59
@DheerajVuppuluri Ok, read my edit. – Yassin Hajaj Jul 02 '16 at 09:04
@DheerajVuppuluri check my answer – Govinda Sakhare Jul 02 '16 at 09:13
@YassinHajaj your snippet will fail if he'll provide inputs with spaces something like this `4 4.0 I am a boy` – Govinda Sakhare Jul 02 '16 at 09:15

score 3 · Answer 2 · answered Jul 02 '16 at 08:51

3

Scanner#next() reads up to the first whitespace. If you want to read up to the end of the line, you should use nextLine() instead:

ss = scanner.nextLine();

answered Jul 02 '16 at 08:51

Mureinik

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score 1 · Answer 3 · answered Jul 02 '16 at 08:56

1

You are currently using the next() Function which is using to take only a String before white spaces

Suppose Input : Hello World Then If User using next()

Output: Hello

To take the string till the End of line Use nextLine()

Input: Hello World If user using nextLine() Output: Hello World

answered Jul 02 '16 at 08:56

Tushar Pal

503
6
16

If I use nextLine(), It's not letting me to enter the second string. I could enter only int and double. – Dheeraj Vuppuluri Jul 02 '16 at 09:02
You need to press enter after entering the string – Tushar Pal Jul 02 '16 at 09:06
1

Got it. Thank you! – Dheeraj Vuppuluri Jul 02 '16 at 09:08

Govinda Sakhare · Accepted Answer · 2016-07-02T09:26:25.520

1

I guess you are hitting enter button after providing input of double variable. try code snippet.

dd = scan.nextDouble();
ss = scan.nextLine().trim();
if (ss.isEmpty()) {
   ss = scan.nextLine();
}

edited Jul 02 '16 at 09:26

answered Jul 02 '16 at 09:02

Govinda Sakhare

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Perfect. As i wanted. Thank you. – Dheeraj Vuppuluri Jul 02 '16 at 09:40
If I am not wrong, you're solving HackerRank daily challenge. right? – Govinda Sakhare Jul 02 '16 at 09:41

Concat() in Java

4 Answers4