Array Index Out of Bounds Exception Java

Question

Here is my code   public class countChar        public static void main String   args            int i          String userInput   new String             userInput   Input getString  Please enter a sentence             int   total   totalChars userInput toLowerCase              for  i   0  i  lt  total length  i                           if  total i     0                    System out println  Letter     char    a    i      count      total i                                       public static int   totalChars String userInput            int   total   new int 26           int i          for  i   0  i  lt  userInput length    i                  if  Character isLetter userInput charAt i                      total userInput charAt i  -  a                                      return total            The program s purpose is to ask the user for a string  and then count the number of times each character is used in the string    When I go to compile the program  it works fine  When I run the program  I am able to enter a string in the popup box  but after I submit the string and press OK  I get an error  saying    Exception in thread  main  java lang ArrayIndexOutOfBoundsException  26 at countChar main countChar java 14    I m not completely sure what the problem is or how to fix it

User · Answer

import java io    import java util Scanner  class ar1       public static void main String   args              Scanner sc new Scanner System in           int   a  10 20 30 40 12 32           int bi 0 sm 0            bi sc nextInt              sm sc nextInt            for int i 0 i lt  a length-1 i                  if a i  gt a i 1                    bi a i                if a i  lt a i 1                   sm a i                     System out println  big  bi  small  sm

User · Answer

for   i   0  i  lt  total length  i         remove this       if  total i   0          System out println   Letter     char    a    i      count      total i        The for loop loops until i 26  where 26 is total length  and then your if is executed  going over the bounds of the array  Remove the   at the end of the for loop

User · Answer

This is Very Good Example of minus Length of an array in java  i am giving here both examples   public static int linearSearchArray        int   arrayOFInt    1 7 5 55 89 1 214 78 2 0 8 2 3 4 7      int key   7     int i   0     int count   0     for   i   0  i lt  arrayOFInt length  i             if   arrayOFInt i      key             System out println  Key Found in arrayOFInt       arrayOFInt i              count                        System out println  this Element found the     count     number of Times    return i        this above  i  lt  arrayOFInt length  not need to minus one by length of array  but if you  i  lt   arrayOFInt length -1  is necessary other wise arrayOutOfIndexException Occur  hope this will help you

User · Answer

for   i   0  i  lt  total length  i                                           -- remove the semi-colon here   With this semi-colon  the loop loops until i    total length  doing nothing  and then what you thought was the body of the loop is executed

[java] Array Index Out of Bounds Exception (Java)

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