Scanner doesn t read whole sentence - difference between next and nextLine of scanner class

Question

I m writing a program which allows the user to input his data then outputs it  Its 3 4 correct but when it arrives at outputting the address it only prints a word lets say only  Archbishop  from  Archbishop Street   How do I fix this   import java util     class MyStudentDetails      public static void main  String args             Scanner s   new Scanner System in           System out println  Enter Your Name              String name   s next            System out println  Enter Your Age              int age   s nextInt            System out println  Enter Your E-mail              String email   s next            System out println  Enter Your Address              String address   s next             System out println  Name    name           System out println  Age    age           System out println  E-mail    email           System out println  Address    address

User · Answer

Default delimiter of Scanner is whitespace   Check javadoc for how to change this

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next   will only store the input up to the first token  if there are two words  quot Hi there quot  it means there are two tokens separated by space  delimiter   Every time you call the next   method it reads only one token  if input is  quot Hi there   quot  Scanner scan   new Scanner System in   String str   scan next   System out println str    Output  Hi  So if you both the words you need to call next   again to get the next token which is inefficient for longer string input nextLine   on the other hand grabs the entire line that the user enters even with spaces Scanner scan   new Scanner System in   String str   scan nextLine   System out println str    Output  Hi there

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import java util Scanner   public class Solution        public static void main String   args            Scanner scan   new Scanner System in           String s   scan next            s    scan nextLine            System out println  String      s

User · Answer

Initialize the Scanner this way so that it delimits input using a new line character   Scanner sc   new Scanner System in  useDelimiter    n      Refer the JavaDoc for more details  Use sc next   to get the whole line in a String

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String s  Hi   String s1        For Reading Line by hasNext   of scanner   while scan hasNext       s1   scan nextLine       System out println s s1      This Worked Fine for me for reading Entire Line using Scanner

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java util Scanner  util - package  Scanner - Class     next   reads the string before the space  it cannot read anything after it gets the first space  nextLine   reads the whole line  Read until the end of the line or   n   Note  Not The Next line    Example   My mission in life is not merely to survive  but to thrive    and to do so with some passion  some compassion  some humor    Output    My My mission in life is not merely to survive  but to thrive    Tricks   If you want to read the next line Check Java has method   while  scanner hasNext          scan next       while  scanner hasNext          scan nextLine

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I tried following code but this is not stopping as there is no break condition so it always waiting for input   may be you could add a condition for break  public class Solution        public static void main String   args            Scanner scan   new Scanner System in           int i   scan nextInt            double d   scan nextDouble            String s             while scan hasNext                          s scan nextLine                       System out println  String     s           System out println  Double      d           System out println  Int      i

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Instead of using System in and System out directly  use the Console class - it allows you to display a prompt and read an entire line  thereby fixing your problem  of input in one call   String address   System console   readLine  Enter your Address

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We can easily done using scan nextLine  It will read the rest of the input till the end  Then assign it to your variable  Entire sentence can be printed easily   Here is the example for your better understanding       String s    HackerRank         Scanner scan   new Scanner System in         String s2         scan nextLine       read the rest of the line of input  newline character after the double token       s2   scan nextLine              Concatenate and print the String variables on a new line integer variables on a new line        System out println s   s2        scan close

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To get the whole adress add   s nextLine     read the rest of the line as input   before  System out println  Enter Your Address      String address   s next

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next   is read until the space of the encounter  and the nextLine   is read to the end of the line  Scanner scan   new Scanner System in   String address   scan next    s    scan nextLine

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I set the token delimiter to be a newline pattern  read the next token  and then put the delimiter back to whatever it was   public static String readLine Scanner scanner            Pattern oldDelimiter   scanner delimiter            scanner useDelimiter    r  n    n  x0B  x0C  r  u0085  u2028  u2029             String r   scanner next            scanner useDelimiter oldDelimiter           return r

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next   can read the input only till the space  It can t read two words separated by space  Also  next   places the cursor in the same line after reading the input   nextLine   reads input including space between the words  that is  it reads till the end of line  n   Once the input is read  nextLine   positions the cursor in the next line   for reading the entire line you can use nextLine

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Use nextLine   instead of next   for taking sentence as string input   Scanner sc   new Scanner System in   String s   sc nextLine

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import java util Scanner  public class Solution        public static void main String   args            Scanner scan   new Scanner System in           int i   scan nextInt            double d   scan nextDouble            String s             while scan hasNext                          s scan nextLine                       System out println  String     s           System out println  Double      d           System out println  Int      i

User · Answer

I would use Scanner nextLine opposed to next for your address attribute       This method returns the rest of the current line  excluding any line separator at the end    Since this returns the entire line  delimited by a line separator  it will allow the user to enter any address without any constraint

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Scanner scanner   new Scanner System in   String str   scanner next    str    scanner readLine     String str   scanner next        gt  it fetch the 1st word of the line  hello world     gt   quot hello quot   str    scanner nextLine        gt  This method returns the rest of the current line  excluding any line separator at the end   hello world     gt   quot  world   quot

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I had the same question  This should work for you    s nextLine

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You can do this   class MyStudentDetails      public static void main  String args              Scanner s   new Scanner System in            System out println  Enter Your Name               String name   s nextLine             System out println  Enter Your Age               String age   s nextLine             System out println  Enter Your E-mail               String email   s nextLine             System out println  Enter Your Address               String address   s nextLine               System out println  Name    name            System out println  Age    age            System out println  E-mail    email            System out println  Address    address

User · Answer

the below piece of code should do what yoiu are looking for   public static void main String   args        Scanner scan   new Scanner System in       String s   scan nextLine        System out println s       scan close

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it only prints a word lets say only  Archbishop  from  Archbishop Street   It is only printing the word because Scanner functions such as next    nextInt    etc  read only a token at time  Thus this function reads and returns the next token   For example if you have  x y z  s next   will return x  s nextLine   y z   Going back to your code if you want to read the whole line  Archbishop Street   String address   s next       s    Archbishop  Then address    s nextLine       s   s     Street

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This approach is working  but I don t how  can anyone explain  how does it works         String s   sc next    s    sc nextLine

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Below is the sample code to read a line in Standard input using Java Scanner class   import java util Scanner   public class Solution        public static void main String   args            Scanner scan   new Scanner System in           String s   scan nextLine            System out println s           scan close              Input      Hello World   Output      Hello World

[java] Scanner doesn't read whole sentence - difference between next() and nextLine() of scanner class

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