Question

Description:

This Java program will read in data from a file students.txt that keeps records of some students. Each line in students.txt contains information about one student, including his/her firstname, lastname, gender, major, enrollmentyear and whether he/she is a full-time or part-time student in the following format.

FIRSTNAME      LASTNAME        GENDER              MAJORENROLLMENTYEAR FULL/PART

The above six fields are separated by a tab key.

A user can input a keyword indicating what group of students he is searching for. For example, if the user inputs “IT”, it means he is interested and expecting to retrieve information about students majored in IT; if the user inputs “Female”, it means he wants to retrieve some information about those female students.

Based upon the user’s input, the program is expected to collect the records of those students that satisfy the searching criteria, and write these records into another specified file. The resulting file will be a subset of the original file.

Specifications:

In addition to the main method, you need to create another method

• processData()

main Method

1. The main method should first create a Scanner object connected to file students.txt.
2. The main method should create a second Scanner object for users’ input.
3. The main will then prompt a message asking for users’ input of the searching keyword, and read in this keyword.
4. The main will then prompt a message asking the user for the name of the output file, and read in that file name.
5. The main method will then create a PrintStream object connected to the file with the specified output file name.
6. The main method will then call the method processData(), passing in the Scanner object for the input file, the PrintStream object for the output file, and the searching keyword which is a string.
7. Close the input file by closing the Scanner object.
8. Close the output file by closing the PrintStream object.
1. Please apply the try/catch statement in the main method to prevent the FileNotFoundException exception occurring.

processData Method

1. The processData() method has three parameters: a Scanner object, a PrintStream object, and a String for the searching keyword.
2. The processData() method will read in data line by line, and then process every token on that line.
3. If any token in a line matches with the searching keyword, output the entire line to the specified output file.

4. Please do NOT use the split() method in this program to split a string into a string array, but create a Scanner object for a line, and process every token on that line.

Output Your output should look something like follows $java Students Please input the keyword you are searching for: IT Please input the name of the output file. itResults.txt When opening the itResult.txt file, you should be able to see the content of the file as: Henry Brown Male IT Ayanna Miller Female IT Mia Eva Nina Taylor Female IT James Murphy Male IT Evan Perry Male IT 2017 2018Full-time 2017 2018Full-time 2017 2015 Part-time Part-time Davis Female IT Moore Female IT Part-time Full-time 2014 Full-time java Students Please input the keyword you are searching for: Female Please input the name of the output file. femaleResults.txt When opening the femaleResulttxt file, you should be able to see the content of the file as: Full-time Full-time Part-time 2015 Full-time Bella Williams Female Business 2016 Part-time Part-time Full-time 2017 Full-time 2015 Part-time Sophia Wright Female Business 2018 Full-time Tracy Scott Female Business 2016 Full-time Smith Female CS 2014 2018 2017 Ava Ayanna Miller Female IT Mia Ellie Wilson Female CS Davis Female IT Roselyn Jones Female Business 2017 2018 Moore Female IT Nina Taylor Female IT Jennifer Powell Female CS Eva

Answer 1

If you have any doubts, please give me comment...

import java.io.*;

import java.util.*;

public class Students {

public static void main(String[] args) {

try {

Scanner fileIn = new Scanner(new File("students.txt"));

Scanner in = new Scanner(System.in);

System.out.print("Please input the keyword you are searching for: ");

String keyword = in.next();

System.out.print("Please input the name of the output file: ");

String fname = in.next();

PrintStream ps = new PrintStream(new File(fname));

processData(fileIn, ps, keyword);

fileIn.close();

ps.close();

} catch (FileNotFoundException e) {

System.out.println(e.getMessage());

}

}

public static void processData(Scanner scnr, PrintStream ps, String keyword) {

while(scnr.hasNextLine()){

String line = scnr.nextLine();

StringTokenizer st = new StringTokenizer(line);

boolean isContained = false;

while(st.hasMoreTokens()){

if(keyword.equalsIgnoreCase(st.nextToken())){

isContained = true;

break;

}

}

if(isContained)

ps.println(line);

}

}

}