We will need to use a variety of Character class and String class methods to validate the data and separate it in order to process it. We will also use a Characterclass method to allow the user to continue the program if desired. The String class’s split method will allow us to process the tokens in a text file in order to decode a secret message. We will use the first letter of every 5th token read in from a file to reveal the secret message. Task #2 String.split and the StringBuilder Class 1. Copy the file secret.txt (Code Listing 9.3) from the Student Files or as directed byyour instructor. This file is only one line long. It contains 2 sentences.2. Write a main method that will read the file secret.txt, separate it into wordtokens.3. You should process the tokens by taking the first letter of every fifth word,starting with the first word in the file. Convert these letters to uppercase andappend them to a StringBuilder object to form a word which will be printedto the console to display the secret message. Code Listing 9.3 (secret.txt)January is the first month and December is the last. Violet is a purple color as are lilac and plum. terminateJava AppiI\.p²\poor\plugins\ g.eciException in thread "main" java.lang.Error: Unresolved compilation problem:The method append(char) is undefined for the type StringBuilderat StringBuilder.main(StringBuilder.java:20) import java.io.File;2 import java.io.FileNotFoundException;3 import java.util.Scanner;4public class StringBuilder {56789012345678901234568901234567890123}public static void main(String[] args) {// Step 1: Read the file and split it into word tokensString filename"secret (2).txt";String fileContentsString[] tokens}}}}=// Step 2: Process the tokens to extract the secret messageStringBuilder secretMessage new StringBuilder();for (int i==readFile(filename);fileContents.split("\\s+");0; i < tokens.length; i += 5) {if (i < tokens.length) { // make sure we don't go out of boundsString wordtokens[i];char firstLetter}==word.charAt(0);secretMessage.append(Character.toUpperCase(firstLetter));// Step 3: Print the secret messageSystem.out.println("The secret message is: + secretMessage.toString());private static String readFile(String filename) {StringBuilder contentsnew StringBuilder();try {scanner.close();System.exit(1);===Scanner scanner new Scanner(new File(filename));while (scanner.hasNextLine()) {scanner.nextLine();=String linecontents.append(line);=} catch (FileNotFoundExceptionSystem.err.println("Error:"1}return contents.toString();e) {File not found: + filename);

The errors you are seeing are because you have named your class StringBuilder, which is the same…

Answered: We will need to use a variety of…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

We will need to use a variety of Character class and String class methods to
validate the data and separate it in order to process it. We will also use a Character
class method to allow the user to continue the program if desired.
The String class’s split method will allow us to process the tokens in a text file in
order to decode a secret message. We will use the first letter of every 5th token read in
from a file to reveal the secret message.

Task #2 String.split and the StringBuilder Class

1. Copy the file secret.txt (Code Listing 9.3) from the Student Files or as directed by
your instructor. This file is only one line long. It contains 2 sentences.
2. Write a main method that will read the file secret.txt, separate it into word
tokens.
3. You should process the tokens by taking the first letter of every fifth word,
starting with the first word in the file. Convert these letters to uppercase and
append them to a StringBuilder object to form a word which will be printed
to the console to display the secret message.

Code Listing 9.3 (secret.txt)
January is the first month and December is the last.
Violet is a purple color as are lilac and plum.

terminate
Java Appi
I\.p²\poor\plugins\ g.eci
Exception in thread "main" java.lang.Error: Unresolved compilation problem:
The method append(char) is undefined for the type StringBuilder
at StringBuilder.main(StringBuilder.java:20)

import java.io.File;
2 import java.io.FileNotFoundException;
3 import java.util.Scanner;
4
public class StringBuilder {
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9
0
1
2
3
4
5
6
8
9
0
1
2
3
4
5
6
7
8
9
0
1
2
3}
public static void main(String[] args) {
// Step 1: Read the file and split it into word tokens
String filename
"secret (2).txt";
String fileContents
String[] tokens
}
}
}
}
=
// Step 2: Process the tokens to extract the secret message
StringBuilder secretMessage new StringBuilder();
for (int i
=
=
readFile(filename);
fileContents.split("\\s+");
0; i < tokens.length; i += 5) {
if (i < tokens.length) { // make sure we don't go out of bounds
String word
tokens[i];
char firstLetter
}
=
=
word.charAt(0);
secretMessage.append(Character.toUpperCase(firstLetter));
// Step 3: Print the secret message
System.out.println("The secret message is: + secretMessage.toString());
private static String readFile(String filename) {
StringBuilder contents
new StringBuilder();
try {
scanner.close();
System.exit(1);
=
=
=
Scanner scanner new Scanner(new File(filename));
while (scanner.hasNextLine()) {
scanner.nextLine();
=
String line
contents.append(line);
=
} catch (FileNotFoundException
System.err.println("Error:
"1
}
return contents.toString();
e) {
File not found: + filename);

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