a. Create a Java program using a NetBeans project containing a single class to p

Question

a. Create a Java program using a NetBeans project containing a single class to produce a table of the occurrences of all letters (A thru Z) and digits (0 thru 9) contained in a user input text.

*Program must have a main method, a method to get user input and a method to get the count of any single character. Other methods may be added as needed.

*Program should regard upper and lower case letters as the same (occurrences of ‘A’ and ‘a’ should be counted together as ‘A’).

*All characters that are not letters nor digits should be ignored.

Sample program run:

Enter text: Use your phone and call me at 1-800-223-343 [Enter]

*Do not use any additional classes in the solution.

Explanation / Answer

AllCharactersCount.java

public class AllCharactersCount {

   /**
   * @param args
   */
   public static void main(String[] args) {
       // TODO Auto-generated method stub
       java.util.Scanner in = new java.util.Scanner(System.in);
       System.out.println("Please enter the input string.. ");
       String s = in.nextLine();
       int count = 0;
       char characters[] = {'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9'};
       for(int i=0; i<characters.length; i++){
       count = getEachCharacterCount(s, characters[i]);
       if(count != 0){
           System.out.println("'"+characters[i] +"' "+ count);
       }
       }
  
   }
   public static int getEachCharacterCount(String s, char c1){
       int count = 0;
       for(int i=0; i<s.length(); i++){
           if(Character.toLowerCase(s.charAt(i)) == Character.toLowerCase(c1)){
               count++;
           }
       }
       return count;
   }

}

Output

Please enter the input string..
Use your phone and call me at 1-800-223-343
'A' 3
'C' 1
'D' 1
'E' 3
'H' 1
'L' 2
'M' 1
'N' 2
'O' 2
'P' 1
'R' 1
'S' 1
'T' 1
'U' 2
'Y' 1
'0' 2
'1' 1
'2' 2
'3' 3
'4' 1
'8' 1

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