Check out example codes for "java output length of each line in a text document". It will help you in understanding the concepts better.

Code Example 1

//Java program to count the number of charaters in a file 
import java.io.*;

public class CountCharacters {
	public static void main(String[] args) throws IOException {
		File file = new File("C:\\Users\\Mayank\\Desktop\\1.txt");
		FileInputStream fileStream = new FileInputStream(file);
		InputStreamReader input = new InputStreamReader(fileStream);
		BufferedReader reader = new BufferedReader(input);

		String line;

		//Initializing counters 
		int countWord = 0;
		int sentenceCount = 0;
		int characterCount = 0;
		int paragraphCount = 1;
		int whitespaceCount = 0;

		//Reading line by line from the file until a null is returned 
		while((line = reader.readLine()) != null) {
			if(line.equals("")) {
				paragraphCount++;
			}

			if(!(line.equals(""))) {
				characterCount += line.length();

				// \\s+ is the space delimiter in java 
				String[] wordList = line.split("\\s+");

				countWord += wordList.length;
				whitespaceCount += countWord - 1;

				//[!?.:]+ is the sentence delimiter in java 
				String[] sentenceList = line.split("[!?.:]+");

				sentenceCount += sentenceList.length;
			}
		}

		System.out.println("Total word count = " + countWord);
		System.out.println("Total number of sentences = " + sentenceCount);
		System.out.println("Total number of characters = " + characterCount);
		System.out.println("Number of paragraphs = " + paragraphCount);
		System.out.println("Total number of whitespaces = " + whitespaceCount);
	}
}

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