In any Java technical Interview it is a common question asked by the interviewer, how to count number of lines characters and words in a file Java. Here is the example.
count number of lines characters and words in a file
[sourcecode language=”java”]
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.io.LineNumberReader;
/**
*
* @author chandrashekhar
*/
public class CountDemo {
final String FILE_PATH = "/home/chandrashekhar/Desktop/FileOperations.txt";
public static void main(String[] args) {
try {
CountDemo cd = new CountDemo();
System.out.println("lines: " + cd.getLineCount());
System.out.println("words: " + cd.getWordCount());
System.out.println("characters: " + cd.getCharacterCount());
} catch (Exception e) {
e.printStackTrace();
}
}
public int getLineCount() {
LineNumberReader reader = null;
int lines_count = 0;
try {
reader = new LineNumberReader(new InputStreamReader(new FileInputStream(new File(FILE_PATH))));
while (reader.readLine() != null) {
lines_count = reader.getLineNumber();
}
} catch (Exception e) {
e.printStackTrace();
}
return lines_count;
}
public int getWordCount() {
int word_count = 0;
LineNumberReader reader = null;
String line = "";
try {
reader = new LineNumberReader(new InputStreamReader(new FileInputStream(new File(FILE_PATH))));
while ((line = reader.readLine()) != null) {
word_count += line.split(" ").length;
}
} catch (Exception e) {
e.printStackTrace();
}
return word_count;
}
public int getCharacterCount() {
int character_count = 0;
LineNumberReader reader = null;
String line = "";
try {
reader = new LineNumberReader(new InputStreamReader(new FileInputStream(new File(FILE_PATH))));
while ((line = reader.readLine()) != null) {
character_count += line.toCharArray().length;
}
} catch (Exception e) {
e.printStackTrace();
}
return character_count;
}
}
[/sourcecode]
To run the above example, you have to make sure that create a file on your desktop and give a name as “FileOperations.txt”. And assign the complete path to FILE_PATH.
Output:
lines: 9
words: 8
characters: 33
