Question

In: Computer Science

You are to create a class called ManageDB. The ManageDB class will have a 2 input...

You are to create a class called ManageDB. The ManageDB class will have a

2 input constructor

that has the following definition:

ManageDB(int number, String fileName)

The constructor will create an array of EmployeeDB objects of length

"number".

The constructor will read the file located at "fileName" and extract the

information from that

file to populate a database of EmployeeDB objects. The file contains

information on the

EmployeeDB objects. This information is contained in records.

The format of each record is as follows:

^ "index of employee" "name of field" = "value of field"

Each record will start with a '^' character.

The "index of employee" is always a 4 character field representing a

positive integer.

The "name of field" is the name of the field to be populated for a

EmployeeDB object.

There is a delimiter between the "name of field" and the "value of field"

which is '='.

The "value of field" is the character string representing the value of the

field specified in "name of field".

The valid "name of field" strings are:

"age"

"name"

"salary"

For each "name of field" the "value of field" will be of the following

type:

age - integer

name - String

salary - double

An example of a valid record is as follow:

^0002age=24

This record would set the 0002 indexed EmployeeDB object age to 24.

You can assume that a record is formatted correctly. That is there will

always be a ^, =, and a valid

"name of field". However, the "index of employee" may not have a valid

number (either out of range or

not a number). The "value of field" may also be invalid if a number is

specified. The name

"value of field" will always have a valid String value (there are no

errors for this field).

If there is an error in the "index of employee" or the "value of field"

portion then ignore the

record and decode the next record. If the "index of employee" portion is

out of range then ignore that

record.

The EmployeeDB class is provided for you. Use the EmployeeDB class to

create the EmployeeDB array and track

the information for each Employee.

You need to create 3 public methods for the ManageDB class.

public String getName(int i) // returns the name of Employee at i index

public int getAge(int i) // returns the age of Employee at i index

public double getSalary(int i) // returns the salary of Employee at i

index

Compile your program with the EmployeeDB class and the DBTester class

which are both supplied to you.

Your program must run to completion and pass all the test cases. Make sure

to handle all exception

that might occur so your program can successfully run. The file to read is

called "EmployeeData.txt"

which is provided to you. Place this file in the working directory of your

project (the base directory

of your package).

Add your name to the DBTester.java file at the top so your name is

displayed.

Capture a screen image of the program ouput with your name and the result

of the test cases.

Files provided:

EmployeeDB.java

DBTester.java

EmployeeData.txt

------------------------

public class DBTester

{

public static void main(String args[ ])

{

System.out.println("Homework 4 test case results by Your Name");

ManageDB m = new ManageDB(5, "EmployeeData.txt");

boolean result;

int testCount = 1; // used to track test numbers

result = isSame(23, m.getAge(0));

if (result == true)

System.out.println("Test Case " + testCount + " Passed");

else

System.out.println("Test Case " + testCount + " Failed");

testCount++;

if (m.getName(0).equals("Jane"))

System.out.println("Test Case " + testCount + " Passed");

else

System.out.println("Test Case " + testCount + " Failed");

testCount++;

result = isSame(1000000.98, m.getSalary(0));

if (result == true)

System.out.println("Test Case " + testCount + " Passed");

else

System.out.println("Test Case " + testCount + " Failed");

testCount++;

result = isSame(-1, m.getAge(1));

if (result == true)

System.out.println("Test Case " + testCount + " Passed");

else

System.out.println("Test Case " + testCount + " Failed");

testCount++;

if (m.getName(1).equals("Jerry"))

System.out.println("Test Case " + testCount + " Passed");

else

System.out.println("Test Case " + testCount + " Failed");

testCount++;

result = isSame(100000, m.getSalary(1));

if (result == true)

System.out.println("Test Case " + testCount + " Passed");

else

System.out.println("Test Case " + testCount + " Failed");

testCount++;

result = isSame(29, m.getAge(2));

if (result == true)

System.out.println("Test Case " + testCount + " Passed");

else

System.out.println("Test Case " + testCount + " Failed");

testCount++;

if (m.getName(2).equals("Joann"))

System.out.println("Test Case " + testCount + " Passed");

else

System.out.println("Test Case " + testCount + " Failed");

testCount++;

result = isSame(50000.8, m.getSalary(2));

if (result == true)

System.out.println("Test Case " + testCount + " Passed");

else

System.out.println("Test Case " + testCount + " Failed");

testCount++;

result = isSame(-1, m.getAge(3));

if (result == true)

System.out.println("Test Case " + testCount + " Passed");

else

System.out.println("Test Case " + testCount + " Failed");

testCount++;

if (m.getName(3).equals(""))

System.out.println("Test Case " + testCount + " Passed");

else

System.out.println("Test Case " + testCount + " Failed");

testCount++;

result = isSame(-1, m.getSalary(3));

if (result == true)

System.out.println("Test Case " + testCount + " Passed");

else

System.out.println("Test Case " + testCount + " Failed");

testCount++;

result = isSame(25, m.getAge(4));

if (result == true)

System.out.println("Test Case " + testCount + " Passed");

else

System.out.println("Test Case " + testCount + " Failed");

testCount++;

if (m.getName(4).equals("John"))

System.out.println("Test Case " + testCount + " Passed");

else

System.out.println("Test Case " + testCount + " Failed");

testCount++;

result = isSame(1177.22, m.getSalary(4));

if (result == true)

System.out.println("Test Case " + testCount + " Passed");

else

System.out.println("Test Case " + testCount + " Failed");

testCount++;

}

private static boolean isSame(double x, double y)

{

double error = .00001;

boolean rv = false;

if (((x + error) >= y) && ((x - error) <= y))

{

rv = true;

}

return rv;

}

}

-----------------------------

employeedata.txt

^0000age=23^0000name=Jane^0000salary=1000000.98^0005age=20^0005name=Joe^00

05salary=11888.22^0002age=29^0002name=Joann^0002salary=50000.8

^00a1age=36^0001name=Jerry^0001salary=100000^0004age=25^0003age=3q2^0004sa

lary=1177.22^0w03name=Joan

^0004name=John^0003salary=100a00a

----------------------------

class EmployeeDB

{

// Member variables

private int age;

private String name;

private double salary;

// Constructors

public EmployeeDB()

{

age = -1;

name = "";

salary = -1.0;

}

// Mutators

public void setName(String n)

{

name = n;

}

public void setAge(int a)

{

age = a;

}

public void setSalary(double s)

{

salary = s;

}

// Accessors

public String getName()

{

return name;

}

public int getAge()

{

return age;

}

public double getSalary()

{

return salary;

}

}

Solutions

Expert Solution

Hi, Please find the solution:

import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.util.ArrayList;
import java.util.List;

public class ManageDB {
    EmployeeDB[] employeeDBS;

    public ManageDB(int number, String fileName) {
        employeeDBS = new EmployeeDB[number];
        File f = new File(fileName);
        List<String> strings = null;
        try {
            strings = Files.readAllLines(f.toPath());
        } catch (IOException e) {
            e.printStackTrace();
            return;
        }
        String wholeFile = strings.get(0);//assuming there are no newlines in the file
        //it is ambiguous if the file has new lines
        String arr[] = wholeFile.split("\\^");
        for (String s : arr) {
            if(s.equalsIgnoreCase("")) continue;
            String indexStr = giveIndexFromStringAsString(s);
            if (isStringOnlyNumbers(indexStr)) {
                int index = Integer.parseInt(indexStr);
                if(index>=number)continue;;
                String s1 = s.split("=")[0].trim();
                String valueOfField = s.split("=")[1].trim();
                String fieldForEmployee = s1.substring(4, s1.length());
                if (fieldForEmployee.equalsIgnoreCase("name") && !isStringOnlyNumbers(valueOfField)) {
                    if( employeeDBS[index]==null){
                        employeeDBS[index] = new EmployeeDB();
                    }
                    employeeDBS[index].setName(valueOfField);
                } else if (fieldForEmployee.equalsIgnoreCase("age") && isStringOnlyNumbers(valueOfField)) {
                    if( employeeDBS[index]==null){
                        employeeDBS[index] = new EmployeeDB();
                    }
                    employeeDBS[index].setAge(Integer.parseInt(valueOfField));
                } else if (fieldForEmployee.equalsIgnoreCase("salary") && isStringAFloatNumber(valueOfField)) {
                    if( employeeDBS[index]==null){
                        employeeDBS[index] = new EmployeeDB();
                    }
                    employeeDBS[index].setSalary(Double.parseDouble(valueOfField));
                }
            } else {
                //ignoring records for improper index
            }

        }
    }

    private static boolean isStringOnlyNumbers(String str) {
        boolean birthyearProper = true;
        for (char s : str.toCharArray()) {
            if (!Character.isDigit(s)) {
                birthyearProper = false;
                break;
            }
        }
        return birthyearProper;
    }

    private static boolean isStringAFloatNumber(String str) {
        boolean stringProper = true;
        int countDots = 0;
        for (char s : str.toCharArray()) {
            if (s == '.') {
                countDots++;
                continue;
            }
            if (!Character.isDigit(s)) {
                stringProper = false;
                break;
            }
        }
        return stringProper && ((countDots == 1 || countDots==0) ? true : false);
    }


    static String giveIndexFromStringAsString(String whole) {
        return whole.substring(0, 4);
    }

    // returns the name of Employee at i index
    public String getName(int i) {
        return employeeDBS[i].getName();
    }

    /// returns the age of Employee at i index
    public int getAge(int i) {
        return employeeDBS[i].getAge();
    }

    // returns the salary of Employee at i index
    public double getSalary(int i) {
        return employeeDBS[i].getSalary();
    }

//    index
}

class EmployeeDB {

// Member variables

    private int age;

    private String name;

    private double salary;

// Constructors

    public EmployeeDB() {

        age = -1;

        name = "";

        salary = -1.0;

    }

// Mutators

    public void setName(String n) {

        name = n;

    }

    public void setAge(int a) {

        age = a;

    }

    public void setSalary(double s) {

        salary = s;

    }

// Accessors

    public String getName() {

        return name;

    }

    public int getAge() {

        return age;

    }

    public double getSalary() {

        return salary;

    }

}

Sample output: Exception(below) is because of lack of data. There will be only minor corrections. For the entries in the array where the index is not present, those records can be removed by you. I left them just in case.

venereology answered 8 months ago
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