Chapter 12 Exercise 13, Introduction to Java Programming , Tenth Edition Y. Dani

Question

Chapter 12 Exercise 13, Introduction to Java Programming, Tenth Edition Y. Daniel LiangY.

Please include comments in your source code.

12.13 (Count characters, words, and lines in a file)
Write a program that will count the number of characters,
words, and lines in a file. Words are separated by whitespace characters.
The file name should be passed as a command-line argument, as shown in Figure 12.13.

FIGURE 12.13 The program displays the number of characters, words, and lines in the given

file.

Explanation / Answer

package Q

import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;

public class A {

public static void main(String[] args) {

if (args.length != 1) {
System.out.println("Invalid arguments.");
System.out.println("Usage: java Q.A filename");
System.exit(1);
}
File filename = new File(args[0]);
if (!filename.exists()) {
System.out.println(filename + " does not exist.");
System.exit(2);
}

int characters = 0;
int words = 0;
int lines = 0;

try {
Scanner input = new Scanner(filename);
while (input.hasNext()) {
String s = input.nextLine();
lines++;
characters += s.length();
String[] split = s.split(" ");
for (String word : split) {
words++;
}
}

} catch (FileNotFoundException ex) {
ex.printStackTrace();
}

System.out.println("Characters: " + characters);
System.out.println("Words: " + words);
System.out.println("Lines: " + lines);

}
}

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