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Java Program to Count Number of Words in a String
This article is created to cover a program in Java to count the total number of words available in a string entered by user.
Count Words in String - Basic Version
The question is, write a Java program to count the number of words in a string. The string must be entered by user at run-time of the program. The program given below is the answer:
import java.util.Scanner; public class fresherearth { public static void main(String[] args) { String str; int totalWords; Scanner s = new Scanner(System.in); System.out.print("Enter the String: "); str = s.nextLine(); String words[] = str.split(" "); totalWords = words.length; System.out.println("\nTotal Number of Words = " +totalWords); } }
Here is its sample run with user input, Welcome to Java as string to count total words available in it:
In above program, the following statement:
String words[] = str.split(" ");
is used to split the string str by white spaces. That above statement can also be replaced with the statement given below:
String words[] = str.split("\\s");
Count Words in String - Complete Version
The problem with previous program is, what if user enters a string in which there is/are single or multiple words separated with more than one white spaces. Therefore, in that case, we need to replace the above statement with:
String words[] = str.split("\\s+");
Here is the complete version of the program:
import java.util.Scanner; public class fresherearth { public static void main(String[] args) { Scanner s = new Scanner(System.in); System.out.print("Enter the String: "); String str = s.nextLine(); String words[] = str.split("\\s+"); System.out.println("\nTotal Number of Words = " +words.length); } }
The snapshot given below shows the sample run with a string input that contains some words separated with multiple white spaces:
The same job of counting total number of words in a given string, can also be done using the following program:
import java.util.Scanner; public class fresherearth { public static void main(String[] args) { String str; int i, strLen, count=1; Scanner s = new Scanner(System.in); System.out.print("Enter the String: "); str = s.nextLine(); strLen = str.length(); for(i=0; i<=(strLen-1); i++) { if(str.charAt(i) == ' ' && str.charAt(i+1)!=' ') count++; } System.out.println("\nTotal Number of Words = " +count); } }
You'll get the same output as of previous program.
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