Java Maps Part 3: use HashMap to find number of word occurrences in a file

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How to use a HashMap to find the number of word occurrences in a file and then find the most frequently used word.

Also a pretty good and basic java hashmap interview problem.
  1. Aaron Writes Code
  2. java
  3. java hashmap
  4. java find number of word occurences
  5. java most frequently used word
  6. java hashmap interview problem
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HashMap is a data structure that you can use to do a O(1) lookup. So, although you have a feature to iterate over the HashMap, using it wouldn't be effecient. A better way to find a word with maximum frequency is to have a variable for it and update it during insertion into the hashmap itself

sril
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how would go about printing the top 20 most occurring words ?

walterbryne
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Hi, I want know how can you exclude some words from a txt file. For ex. "the", "and"

tamtamns
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how do we count the frequency of a specific word?

Lanzengying
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I followed what you did in the video and saved my text file where the project is, but im getting this error. Any ideas?
Exception in thread "main" (The system cannot find the file specified)
at Method)
at Source)
at Source)
at Source)
at Main.main(Main.java:16)

walterbryne