In this article, we will count and print number of words and lines in a text file i.e.;
1. Counting & printing from text file:
- Number of lines
- Number of words
Note:- Same example is implemented using Java 1.8 version and Stream, check Java 8 – Count and print number of lines and words in a text file
1.1 Steps for counting words and lines:
- First write logic to read file from local drive location using BufferedReader & FileReader
- Read file line-by-line using while-loop and increase lineCount variable by 1 (starting from 0, already initialised at the top of method)
- For every line, split String using space as delimiter & assign it to temporary String[] array
- Get number of word count using length property of String[] array
- Now add word count to already initialized wordCount variable (starting from 0, already initialised at the top of method)
- Finally print lineCount & wordCount to console
Sample text file:
Let us move forward and write a simple Java program to demonstrate these steps
ReadCountPrintLinesAndWordsInTextFile.java
package in.bench.resources.count.print.occurences;
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
public class ReadCountPrintLinesAndWordsInTextFile {
// main() method - entry point to start execution
public static void main(String[] args) {
// invoke to count & print for supplied file
countAndPrintLineWord("D://WORKSPACE/TEST_WORKSPACE/"
+ "Java_8_Project/BRN.txt");
}
/**
* this method count &
* prints number of lines & words in a text file
* @param fileName
*/
public static void countAndPrintLineWord(String fileName) {
// local variables
BufferedReader bufferedReader = null;
String line = "";
int lineCount = 0;
int wordCount = 0 ;
// Step 1: Read file from local drive location
try {
bufferedReader = new BufferedReader(
new FileReader(fileName));
// Step 2: Read line from file
while ((line = bufferedReader.readLine()) != null) {
// increase line count by 1
lineCount++;
// Step 3: split line using space as delimiter
String[] words = line.split(" ");
// Step 4 & 5: add word count length
wordCount = wordCount + words.length;
}
// Step 6: print the count value of line & word
System.out.println("Number of lines is : "
+ lineCount);
System.out.println("Number of words is : "
+ wordCount);
}
catch (FileNotFoundException fnfex) {
fnfex.printStackTrace();
}
catch (IOException ioex) {
ioex.printStackTrace();
}
finally {
// close resources, if any
try {
if(null != bufferedReader) {
bufferedReader.close();
}
}
catch (IOException ioex) {
ioex.printStackTrace();
}
}
}
}
Output:
Number of lines is : 4
Number of words is : 41
2. Java 1.7 version onwards:
With the introduction of Java 1.7 version,
- We can simplify the above code by removing finally blocks
- Replacing with try-with-resources statement which takes care of automatic resource management (ARM) i.e.; auto-closing of opened resources without explicit closing inside finally block after necessary null-safety checks
- Thus, it improves readability of the code by reducing number of lines of code
- Let us re-write above program again with try-with-resources statement
ReadCountPrintLinesAndWordsInTextFile.java
package in.bench.resources.count.print.occurences;
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
public class ReadCountPrintLinesAndWordsInTextFile {
// main() method - entry point to start execution
public static void main(String[] args) {
// invoke to count & print for supplied file
countAndPrintLineWord("D://WORKSPACE/TEST_WORKSPACE/"
+ "Java_8_Project/BRN.txt");
}
/**
* this method count &
* prints number of lines & words in a text file
* @param fileName
* @throws IOException
* @throws FileNotFoundException
*/
public static void countAndPrintLineWord(String fileName) {
// local variables
String line = "";
int lineCount = 0;
int wordCount = 0 ;
// Step 1: Read file from local drive location
try(BufferedReader bufferedReader = new BufferedReader(
new FileReader(fileName))) {
// Step 2: Read line from file
while ((line = bufferedReader.readLine()) != null) {
// increase line count by 1
lineCount++;
// Step 3: split line using space as delimiter
String[] words = line.split(" ");
// Step 4 & 5: add word count length
wordCount = wordCount + words.length;
}
// Step 6: print the count value of line & word
System.out.println("Number of lines is : "
+ lineCount);
System.out.println("Number of words is : "
+ wordCount);
}
catch (FileNotFoundException fnfex) {
fnfex.printStackTrace();
}
catch (IOException ioex) {
ioex.printStackTrace();
}
}
}
Output:
Number of lines is : 4
Number of words is : 41
Related Articles:
- Java 8 – Count and print number of lines and words in a text file
- Java 8 – Count and print number of repeated word occurrences in a text file
- Java 8 – Count and print number of repeated character occurrences in a String
- Java – Count and print number of words and lines in a text file
- Java – Count and print number of repeated word occurrences in a String
- Java – Count and print number of repeated character occurrences in a String
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Happy Coding !!
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