How to find the Strings within a text file in Java?

Following Java program accepts a String value from the user, verifies whether a file contains the given String and prints the number of occurrences of the word too.

Example

 Live Demo

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.util.Scanner;
public class FindingWordFromFile {
   public static void main(String args[]) throws FileNotFoundException {
      //Reading the word to be found from the user
      Scanner sc1 = new Scanner(System.in);
      System.out.println("Enter the word to be found");
      String word = sc1.next();
      boolean flag = false;
      int count = 0;
      System.out.println("Contents of the line");
      //Reading the contents of the file
      Scanner sc2 = new Scanner(new FileInputStream("D:\sampleData.txt"));
      while(sc2.hasNextLine()) {
         String line = sc2.nextLine();
         System.out.println(line);
         if(line.indexOf(word)!=-1) {
            flag = true;
            count = count+1;
         }
      }
      if(flag) {
         System.out.println("File contains the specified word");
         System.out.println("Number of occurrences is: "+count);
      } else {
         System.out.println("File does not contain the specified word");
      }
   }
}

Output

Enter the word to be found
the
Contents of the line
Tutorials Point originated from the idea that there exists a class of readers who respond better 
to online content and prefer to learn new skills at their own pace from the comforts of their drawing rooms.
The journey commenced with a single tutorial on HTML in 2006 and elated by the response it generated, 
we worked our way to adding fresh tutorials to our repository which now proudly flaunts a wealth of 
tutorials and allied articles on topics ranging from programming languages to web designing to academics and much more.
40 million readers read 100 million pages every month
Our content and resources are freely available and we prefer to keep it that way to encourage our readers
 acquire as many skills as they would like to. We don’t force our readers to sign up with us or submit 
their details either. No preconditions and no impediments. Simply Easy Learning!
File contains the specified word
Number of occurrences is: 3

Maruthi Krishna

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Updated on: 10-Sep-2019

6K+ Views

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