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Java Program to Count the number of occurrences of a char in a String?

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instanceof java

Posts: 576
Nickname: instanceof
Registered: Jan, 2015

instanceof java is a java related one.
Java Program to Count the number of occurrences of a char in a String? Posted: Sep 13, 2015 8:02 AM
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This post originated from an RSS feed registered with Java Buzz by instanceof java.
Original Post: Java Program to Count the number of occurrences of a char in a String?
Feed Title: Instance Of Java
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Feed Description: Instance of Java. A place where you can learn java in simple way each and every topic covered with many points and sample programs. 		Latest Java Buzz Posts
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Solution #1:

  1. package com.javatutorial;
  2.  
  3. import java.util.Scanner;
  4.  
  5. public class CountNumberofChars {
  6.  
  7.  public static void main(String[] args) {
  8.   
  9.  String str = "";
  10.  
  11.  Scanner in= new Scanner(System.in);
  12.  System.out.println("Please enter a String");
  13.  
  14.  str=in.nextLine();
  15.  
  16.  System.out.println("Please enter a Character");
  17.  String chr=in.next();
  18.  
  19.  int charCount = str.length() - str.replaceAll("a", "").length();
  20.  
  21.  System.out.println("Number of occurances of given character:"+charCount);
  22.  
  23. }

  25. }

Output:

  1. Please enter a String
  2. Java
  3. Please enter a Character
  4. a
  5. Number of occurances of given character:2


Solution #2:


  1. package com.javatutorial;
  2.  
  3. import java.util.Scanner;
  4.  
  5. public class CountNumberofChars {
  6.   
  7. public static int countOccurrences(String find, String string)
  8. {
  9. int count = 0;
  10. int indexOf = 0;
  11.  
  12. while (indexOf > -1)
  13. {
  14.     indexOf = string.indexOf(find, indexOf + 1);
  15.     if (indexOf > -1)
  16.             count++;
  17.       }
  18. return count;
  19.  }

  21.  public static void main(String[] args) {
  22.   
  23.  int charCount=countOccurrences("a", "Instance of Java");
  24.  
  25.  System.out.println("Number of occurances of given character:"+charCount);
  26.  
  27. }

  29. }

Output:

  1. Number of occurances of given character: 3

Read: Java Program to Count the number of occurrences of a char in a String?

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