Hashmap implementation to count the occurrences of each character

by

You’re leaving char ch set as the same character through each execution of the loop.

It should be:

ch = char_array[i]; 
if(charCounter.containsKey(ch)){
     charCounter.put(ch, charCounter.get(ch)+1);
}
else
{
    charCounter.put(ch, 1);
}

Inside the for loop.

More Related Contents:

  1. What are the differences between a HashMap and a Hashtable in Java?
  2. Initialization of an ArrayList in one line
  3. Why is there no SortedList in Java?
  4. How to convert comma-separated String to List?
  5. Why there is no ConcurrentHashSet against ConcurrentHashMap
  6. Assert equals between 2 Lists in Junit
  7. Java Immutable Collections
  8. How to copy a java.util.List into another java.util.List
  9. How do I keep the iteration order of a List when using Collections.toMap() on a stream?
  10. What is the most efficient Java Collections library? [closed]
  11. How to convert a Java object (bean) to key-value pairs (and vice versa)?
  12. How to sort alphabetically while ignoring case sensitive?
  13. Binding a list in @RequestParam
  14. Java List Sorting: Is there a way to keep a list permantly sorted automatically like TreeMap?
  15. What is the time complexity performance of HashSet.contains() in Java?
  16. Easy way to convert Iterable to Collection
  17. Add multiple items to an already initialized arraylist in Java
  18. Ordering of elements in Java HashSet
  19. Multiple indexes for a Java Collection – most basic solution?
  20. ArrayList: how does the size increase?
  21. Using a prepared statement and variable bind Order By in Java with JDBC driver
  22. Sort List of Strings with Localization
  23. Iterate through string array in Java
  24. How to flatten all items from a nested Java Collection into a single List?
  25. Checking if a collection is empty in Java: which is the best method?
  26. ArrayList vs LinkedList from memory allocation perspective
  27. Why Collections.sort uses merge sort instead of quicksort?
  28. Best way to get value from Collection by index
  29. How to remove common values from two array lists
  30. How to convert an int[] array to a List?

Leave a Comment