In this tutorial, I am going to explain a java program to count number of words in a string.
Given an input string, write a code to count number of words in a string. The words in a string are separated by space(‘ ‘).
For example –
Example 1 –
Input – “Java Programming question”
Output – 3
Example 2 –
Input String – “Programming Tutorials”
Output – 2
Algorithm to Count Number of Words in a String
To count a number of words in a String. Traverse a string and check if a current character is a space and the next character is not space then increment the word count by 1.
Java Program to Count Number of Words in a String
Let’s write a java code for the discussed algorithm. In this programming example, we are writing a code a word count program in java.
The time complexity of this approach is O(n).
Find first non-repeating character in a string
METHOD 2:
Java Program to Count Number of Words in a String using Split
Using the split() method in java we can solve this problem in single line of code. In this solution, we use the regular expression “\\s+” to split the string on whitespace. The string split method returns an array, if we print the length of an array that is the number of words in a given string.
Video Tutorial
In this video tutorial, I have explained the logic of counting number of words in a string.
How to Count Number of Words in a String – Java
