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How to Count the number of Words in a String in Java

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by Abdul Rawoof A R dot icon Updated: Feb 12, 2024

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To count the number of words and lines in a string in Java, you can use the following methods:  

  • You can use the "split" method of the String class to split the string into an array of words. Then, use the array's length property to get the number of words. The "length" property of the array will give you the number of words in the string.  
  • To count the number of lines in a string, you can use the "split" method of the String class. This method splits the string into an array of lines. Then, use the array's length property to get the number of lines. The "length" property of the array will give you the number of lines in the string.  
  • In Java, developers use the split method of the String class to split a string into an array of substrings. It's based on a specified delimiter character or regular expression.  
  • Length: The length function is a property of the String class that returns the length of a string. 


Here is an example how to count the number of words and lines in a string in Java;

Fig 1: Preview of code snippet in IDE.

Fig 2: Preview of the output that you will get on running this code from your IDE.

Code

Words and lines counter from user input for Java

JavadotLines of Code : 14dotLicense : Strong Copyleft (CC BY-SA 4.0)

Dependent Libraries : 
List<String> arrayList = new ArrayList<>();
int words = 0;

Scanner scan = new Scanner(System.in);
while (scan.hasNext()) {
  String line = scan.nextLine();
  arrayList.add(line);
  words += line.split(" ").length;
  System.out.println("lines: " + arrayList.size());
  System.out.println("words: " + words);
}

scan.close();

Instructions

Follow the steps carefully to get the output easily:

  1. Copy the code using the "Copy" button above, and paste it in a Java file in your IDE(IntelliJ Preferable).
  2. Run the file to generate the output.


Note: Create class, main method and then copy the code snippet inside the main method.


I hope you found this useful.


I found this code snippet by searching for 'getting word and line counter using java' in kandi. You can try any such use case!

Environment Tested

I tested this solution in the following versions. Be mindful of changes when working with other versions.

  1. The solution is created in IntelliJ IDE and Java jdk-'11.0.17'.
  2. The solution is tested on Java 11.0.17.


Using this solution, we are able to get the count of line and word using java with simple steps. This process also facilities an easy way to use, hassle-free method to create a hands-on working version of code which would help us to get the count of line and word using Java.

FAQ

1. How do I count the number of words in a string in Java? 

You can cut up the string with the use of whitespace as a delimiter. Then, count the length of the resulting array. 


2. How do I handle many spaces between words? 

You can use regular expressions to handle many spaces. Split the string using "\s+" as the delimiter. 


3. How can I exclude punctuation from the word count? 

You can use regular expressions to remove punctuation before splitting the string. Or, you can loop through each character and exclude punctuation characters. 


4. What about counting words in many languages or with non-English characters? 

Java's String class methods, such as split(), work with Unicode characters. They can handle words in many languages. 


5. Is there a library or external tool I can use for more advanced word counting? 

Yes, you can use libraries like Apache Commons Text. It's for more advanced word counting and analysis. You can also use external tools like Natural Language Processing (NLP) libraries. 

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