How to search a particular character from string and find how many times it occured

Question

Store the following sentence in String

“JAVA IS TOUGH LANGUAGE"

I would like to ask a user to provide a character as an input and then print the total number of occurrence of that character in the above sentence. Moreover if a user wants to search a particular phrase or character in string he/she should able to search it.

Please tell me the simple way of beginners.

See there: http://stackoverflow.com/questions/275944/how-do-i-count-the-number-of-occurrences-of-a-char-in-a-string — Mik378, Nov 17 '12 at 17:27
i am bigginer i know about loops,arrays,methods,class,constructor,string,inputoutput method and etc but this question i couldn't understand what it means :( — user1832150, Nov 17 '12 at 17:48

score 2 · Accepted Answer · answered Nov 17 '12 at 17:49

  String s ="JAVA IS TOUGH LANGUAGE";
       char c ='A'; //character c is static...can be modified to accept user input
    int cnt =0;
    for(int i=0;i<s.length();i++)
        if(s.charAt(i)==c)
            cnt++;
    System.out.println("No of Occurences of character "+c+"is"+cnt);

Bohemian · Answer 2 · 2012-11-17T18:19:46.967

1

The calculation can be done in one line:

String sentence ="JAVA IS TOUGH LANGUAGE";
String letter = "x"; // user input

int occurs = sentence.replaceAll("[^" + letter + "]", "").length();

This works by replacing every character that is not the letter (using the regex [^x]) with a blank (effectively deleting it), then looking at the length of what's left.

edited Nov 17 '12 at 18:19

answered Nov 17 '12 at 17:50

Bohemian

412,405
93
575
722

Nothing. You have your answer of how many time the letter occurs in the sentence – Bohemian Nov 17 '12 at 17:53
@user1832150 See edited answer for an explanation of how it works. – Bohemian Nov 17 '12 at 18:04

score 0 · Answer 3 · answered Nov 17 '12 at 18:09

This version the user would pass in the character they wish to search for. So for example, from the command line they would call the program like so:

java TestClass A

This would search for "A" in the string.

public class TestClass {
  static String searchString = "JAVA IS TOUGH LANGUAGE";
  static public void main(String[] args) {
    int answer = 0;
    if(args.length > 0){
        char searchChar = args[0].charAt(0);
        for (int i = 0; i < searchString.length(); i++){
            if (searchString.charAt(i) == searchChar){
                answer += 1;
            }
        }
    }
    System.out.println("Number of occurences of " + args[0] + " is " + answer);
  }
}

How to search a particular character from string and find how many times it occured

3 Answers3