Question

Java2

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..Il AT&T令 12:28 AM Back Complete and Submit Lab 2C Detail Submission Grade Complete and Submit Lab 2C Due: Mar 1, 2019 at 11:59 PM In class you learned how to read text from a file using the Scanner class and write text to a file using the Formatter class. This lab allows you to apply the skills you learned about files and apply them to Strings and characters HCC recently opened a bee hive on campus (Really! Read about it here Now imagine that the college started to market and sell honey under the brand HCC Honey Inc. (Not really...you have to imagine it.) You are the newest employee of the college working with this fictitious brand. On your first day of work, an old USB drive was given to you by the sales department. The USB contains a mailing list text file with numerous email addresses You've been asked to perform some processing on each email address (each of which appears on a separate line) If no @ symbol appears in the address, you should displav the following to standard Dashboard Calendar To Do Notifications Inbox

This is the mailing text file for the assignment

Answer 1

Lab2C.java

/**
 *  Name: 
 *  Course number:
 *  Section:
 *  This program reads a mailing list text file from disk and tells whether
 *  the email addresses are invalid. If the email address is valid, then 
 *  it gives statistics about address and does some string manipulations 
 *  and writes to another text file.
 */
package abc1;
import java.io.*;
public class Lab2C {
        public static void main(String[] args) {
                
                try {
                        File myfile = new File("src/abc1/Lab2A.txt");         //Creating file object representing text file
                        FileReader filereader = new FileReader(myfile);         //creating a connection stream  for chars that connects to text file
                        BufferedReader reader = new BufferedReader(filereader); //chain the FileReader to BufferedReader for efficiency
                                        //For output file
                        File mynewfile = new File("src/abc1/howardBeeMailing.txt");   //creating new file
                        FileWriter filewriter = new FileWriter(mynewfile);
                        BufferedWriter writer = new BufferedWriter(filewriter);
                        
                        String line = null;
                        while((line=reader.readLine())!=null) {         //reading each line till end of file is found
                                boolean valid = false;                                  //initializing validity of each line as false, then we will check
                                if(line.contains("@")) {                                //if email address contains @
                                        valid = true;
                                        System.out.println(line.trim().toLowerCase());  //remove space, print in lowercase
                                        System.out.println("Length: " + line.length());
                                        System.out.println("Characters before @: " + (line.indexOf('@')));      //calculating chars before @
                                        System.out.println("Characters after @: " + (line.length()-line.indexOf('@')-1));       //calculating chars after @
                                                                //writing valid email addresses with @howardcc.edu to another fle
                                        
                                        if(line.contains("[email protected]")) {
                                                String str = line.trim().toUpperCase();
                                                writer.write(str);
                                                writer.write('\n');
                                        }
                                        else if(line.contains("howardcc.edu")) {
                                                writer.write(line.trim());
                                                writer.write('\n');
                                        }
                                }
                                else {                                                                  //if email address doesn't contain @
                                        System.out.println(line + " - " + "Email address unreadable");
                                }
                                
                        }
                        reader.close();
                        writer.close();
                }
                catch(Exception e){
                        e.printStackTrace();
                }
        }
}

Time taken to complete: 55 Mins

Most difficult part: Creating and accessing files.