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Counting number of characters in text file using java
We can read characters in a file using BufferedReader class of Java. See the example below −
Example
Consider the following text file in the classpath.
test.txt
This is Line 1 This is Line 2 This is Line 3 This is Line 4 This is Line 5 This is Line 6 This is Line 7 This is Line 8 This is Line 9 This is Line 10
Tester.java
import java.io.BufferedReader; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; import java.io.InputStreamReader; public class Tester { private static final String FILE_PATH = "data.txt"; public static void main(String args[]) throws IOException { FileUtil fileUtil = new FileUtil(FILE_PATH); System.out.println("No. of characters in file: " + fileUtil.getCharCount()); } } class FileUtil { static BufferedReader reader = null; public FileUtil(String filePath) throws FileNotFoundException { File file = new File(filePath); FileInputStream fileStream = new FileInputStream(file); InputStreamReader input = new InputStreamReader(fileStream); reader = new BufferedReader(input); } public static int getCharCount() throws IOException { int charCount = 0; String data; while((data = reader.readLine()) != null) { charCount += data.length(); } return charCount; } }
This will produce the following result −
Output
No. of characters in file: 141
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