how to take user input in Array using java

Question

how to take user input in Array using Java   i e we are not initializing it by ourself in our program but the user is going to give its value   please guide

User · Answer

import java util Scanner   class Example     Checks to see if a string is consider an integer   public static boolean isInteger String s        if s isEmpty   return false       for  int i   0  i  lt s length     i            char c   s charAt i            if  Character isDigit c   amp  amp  c    -                return false             return true       Get integer  Prints out a prompt and checks if the input is an integer  if not it will keep asking   public static int getInteger String prompt       Scanner input   new Scanner System in       String in           System out println prompt       in   input nextLine        while  isInteger in            System out println prompt           in   input nextLine              input close        return Integer parseInt in      public static void main String   args       int    a   new int 6       for  int i   0  i  lt  a length   i           int tmp   getInteger  Enter integer for array   i         Force to read an int using the methods above          a i    tmp

User · Answer

import java util Scanner   class bigest       public static void main  String   args            Scanner input   new Scanner System in            System out println   how many number you want to put in the pot             int num   input nextInt            int numbers     new int num            for  int i   0  i  lt  num  i                  System out println   number    i                     numbers i    input nextInt                       for  int temp   numbers               System out print  temp     t                       input close

User · Answer

Here s a simple code that reads strings from stdin  adds them into List lt String gt   and then uses toArray to convert it to String    if you really need to work with arrays    import java util     public class UserInput       public static void main String   args            List lt String gt  list   new ArrayList lt String gt             Scanner stdin   new Scanner System in            do               System out println  Current list is     list               System out println  Add more   y n                 if  stdin next   startsWith  y                      System out println  Enter                       list add stdin next                   else                   break                          while  true           stdin close            System out println  List is     list           String   arr   list toArray new String 0            System out println  Array is     Arrays toString arr                See also    Why is it preferred to use Lists instead of Arrays in Java  Fill a array with List data

User · Answer

package userinput   import java util Scanner   public class USERINPUT        public static void main String   args             Scanner input   new Scanner System in              allow user  input          System out println  How many numbers do you want to enter             int num   input nextInt             int array     new int num            System out println  Enter the     num     numbers now              for  int i   0   i  lt  array length  i                  array i    input nextInt                         you notice that now the elements have been stored in the array    array            System out println  These are the numbers you have entered             printArray array            input close                  this method prints the elements in an array             if this case is true  then that s enough to prove to you that the user input has    been stored in an array            public static void printArray int arr              int n   arr length           for  int i   0  i  lt  n  i                  System out print arr i

User · Answer

It vastly depends on how you intend to take this input  i e  how your program is intending to interact with the user   The simplest example is if you re bundling an executable - in this case the user can just provide the array elements on the command-line and the corresponding array will be accessible from your application s main method   Alternatively  if you re writing some kind of webapp  you d want to accept values in the doGet doPost method of your application  either by manually parsing query parameters  or by serving the user with an HTML form that submits to your parsing page   If it s a Swing application you would probably want to pop up a text box for the user to enter input   And in other contexts you may read the values from a database file  where they have previously been deposited by the user   Basically  reading input as arrays is quite easy  once you have worked out a way to get input   You need to think about the context in which your application will run  and how your users would likely expect to interact with this type of application  then decide on an I O architecture that makes sense

User · Answer

How to accept array by user Input  Answer -  import java io     import java lang     class Reverse1        public static void main String args    throws IOException         int a   new int 25         int num 0 i 0        BufferedReader br new BufferedReader new InputStreamReader System in          System out println  Enter the Number of element          num Integer parseInt br readLine           System out println  Enter the array          for i 1 i lt  num i              a i  Integer parseInt br readLine                  for i num i gt  1 i--            System out println a i

User · Answer

You can do the following       import java util Scanner       public class Test                public static void main String   args                 int arr                Scanner scan   new Scanner System in                  If you want to take 5 numbers for user and store it in an int array             for int i 0  i lt 5  i                      System out print  Enter number      i 1                           arr i    scan nextInt          Taking user input                               For printing those numbers             for int i 0  i lt 5  i                     System out println  Number      i 1           arr i

User · Answer

int length      Scanner input   new Scanner System in       System out println  How many numbers you wanna enter         length   input nextInt        System out println  Enter     length     numbers  one by one           int   arr   new int length       for  int i   0  i  lt  arr length  i              System out println  Enter the number      i   1                     Below is the way to collect the element from the user         arr i    input nextInt                auto generate the elements           arr i     int  Math random   100             input close        System out println Arrays toString arr

[java] how to take user input in Array using java?

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