Question

Please complete the following programming with clear explanations. Thanks!

Homework 1 – Programming with Java:

What This Assignment Is About?

Classes (methods and attributes) •

Objects

Arrays of Primitive Values

Arrays of Objects

Recursion

for and if Statements

Selection Sort   

Use the following Guidelines:

Give identifiers semantic meaning and make them easy to read (examples numStudents, grossPay, etc.)

Use upper case for constants. • Use title case (first letter is upper case) for classes.

Use lower case with uppercase word separators for all other identifiers (variables, methods, objects).

Use tabs or spaces to indent code within blocks (code surrounded by braces).

This includes classes, methods, and code associated with if, switch and loop statements. Be consistent with the number of spaces or tabs that you use to indent.

Use white space to make your program more readable.

For each file (class) in your assignment, provide a heading (in comments) which includes:
A description of what this program is doing.

Part 2 Classes, Objects, and Arrays

In this assignment, we will be making a program that create an examination seating with a number of rows and columns specified by a user.

Use the file HomeworkTwo.java (As follows).

public class HomeworkTwo {

    public static void main(String[] args) {

        Classroom classroom;
        Student data;
        int row, col, rowNum, columnNum;
        String info;
        Scanner scan = new Scanner(System.in);

        System.out.println ("How many rows do you want?");
        rowNum = scan.nextInt();

        System.out.println ("How many columns do you want?");
        columnNum = scan.nextInt();

        classroom = new Classroom(rowNum, columnNum);

        System.out.println ("Capture a student information (name/lastname) or enter \"Q\" to quit.");
        info = scan.next();

        while (!info.equalsIgnoreCase( "Q")) {

            data = new Student(studentInfo);

            System.out.println("Capture the row number where the student wants to sit: ");
            row = scan.nextInt();
            System.out.println("Capture the column number where the student wants to sit: ");
            col = scan.nextInt();

            if (classroom.isValid(row, col) == false) {
                System.out.println("\n row or column number is not valid.");
                System.out.println("A student " + data.getFirstName() + " " + data.getLastName() + " is not assigned to a seat.");
            } else {
                if (classroom.setStudentAt(row, col, data) == true) {
                    System.out.println("/n The seat at row " + row + " and column " + col + " is assigned to " + data.toString());
                    System.out.println(classroom);
                } else {
                    System.out.println("/n The seat at row " + row + " and column " + col + " is taken.");
                }
            }

            // Read the next studentInfo
            System.out.println ("Capture a student information (name/lastname) or enter \"Q\" to quit.");
            info = scan.next();
        }

        scan.close();
    }
}

Save HomeworkTwo.java and all files requested below in the same folder.


Step 1

First, create a file named Student.java and define a class Student. It should have two instance variables, lastName (String) and firstName (String). The class must include the following methods:

public Student ( ) Constructs a Student object by assigning the default string " bar " to lastName and “foo” to firstName.

public Student (String info) Constructs a Student object using the string info. Use the split method of the String class to extract first name and last name, then assign them to each instance variable of the Student class. An example of the input string is:

“John/Doe”

public String getLastName ( ) It should return the instance variable lastName.

public String getFirstName ( )

It should return the instance variable firstName.
public String toString ( )

It should return a string containing the initial character of the first name, a period, the initial character of the last name, and a period.
An example of such string for the student John Doe is:

“J.D.”

Step 2

Second, create a class called Classroom. This class should be defined in a file named Classroom.java. The class contains a 2-dimensional array (called seats) of Student objects. The class must include the following methods:

Public Classroom (int rowNum, int columnNum) It instantiates a two-dimensional array of the size "rowNum" by "columnNum". Then it initializes each student element of this array using the constructor of the class Student without any parameter. So, each student will have default values for its instance variables.

private Student getStudentAt (int row, int col)
It returns the student object at the indexes row and col (specified by the parameters) from the 2D array "seats".

public boolean setStudentAt (int row, int col, Student data)
The method assign the Student object referenced as "data" to the seat at "row" and "col". If the seat has a default student, i.e., a student with the last name "bar" and the first name "foo", then we can assign the new student "data" to that seat and the method returns true. Otherwise, this seat is considered to be taken by someone else, the method does not assign the student and returns false.

public boolean isValid (int row, int col)
The method checks if the parameters row and col are valid. If at least one of the parameters "row" or "col" is less than 0 or larger than the last index of the array then it returns false. Otherwise it returns true.

public String toString ( )
Returns a String containing the information of the array “seats”. It should use the toString method of the class Student and return the following format:

“The current seating: D.J. foo.bar. E.T. foo.bar. foo.bar. S.W. T.C. A.T. foo.bar.”

* the “” where used to indicate that the 4 lineas are one string. But, should not be included in the
returned value.


After compiling Student.java, Classroom.java, and HomeworkTwo.java files then execute HomeworkTwo.class.    

Sample Output:

Make sure that your program works at least with this scenario.

C:\MyJava\applications>java HomeworkTwo

How many rows do you want?

3

How many columns do you want?

3

Capture a student information (name/lastname) or enter "Q" to quit. Mickey/Mouse Capture the row number where the student wants to sit:

1

Capture the column number where the student wants to sit:

2

The seat at row 1 and column 2 is assigned to M.M.

The current seating:

foo.bar. foo.bar. foo.bar.

foo.bar. foo.bar. M.M.

foo.bar. foo.bar. foo.bar.

Capture a student information (name/lastname) or enter "Q" to quit.

Daisy/Duck

Capture the row number where the student wants to sit:
2

Capture the column number where the student wants to sit:

0 The seat at row 2 and column 0 is assigned to D.D.

The current seating:

foo.bar. foo.bar. foo.bar.

foo.bar. foo.bar. M.M.

D.D. foo.bar. foo.bar.

Capture a student information (name/lastname) or enter "Q" to quit.

Clarabelle/Cow

Capture the row number where the student wants to sit:

2 Capture the column number where the student wants to sit:

1
The seat at row 2 and column 1 is assigned to C.C.

The current seating:

foo.bar. foo.bar. foo.bar.

foo.bar. foo.bar. M.M.

D.D. C.C. foo.bar.

Capture a student information (name/lastname) or enter "Q" to quit.

Max/Goof

Capture the row number where the student wants to sit:

0

Capture the column number where the student wants to sit:

0

The seat at row 0 and column 0 is assigned to M.G.


The current seating:

M.G. foo.bar. foo.bar.

foo.bar. foo.bar. M.M.

D.D. C.C. foo.bar.

Capture a student information (name/lastname) or enter "Q" to quit.

Horace/Horsecollar

Capture the row number where the student wants to sit:

5

Capture the column number where the student wants to sit:

1

row or column number is not valid.

A student Horace Horsecollar is not assigned a seat.

Capture a student information (name/lastname) or enter "Q" to quit.

Sylvester/Shyster

Capture the row number where the student wants to sit:

2

Capture the column number where the student wants to sit:

0

The seat at row 2 and column 0 is taken.

Capture a student information (name/lastname) or enter "Q" to quit.

Snow/White

Capture the row number where the student wants to sit:

-1

Capture the column number where the student wants to sit:

0

row or column number is not valid.

A student Snow White is not assigned a seat.

Capture a student information (name/lastname) or enter "Q" to quit.

Jiminy/Criket

Capture the row number where the student wants to sit:

0

Capture the column number where the student wants to sit:

2

The seat at row 0 and column 2 is assigned to J.C.

The current seating:

M.G. foo.bar. J.C.

foo.bar. foo.bar. M.M.

D.D. C.C. foo.bar.

Capture a student information (name/lastname) or enter "Q" to quit.

Q

Answer 1

Note: Could you plz go through this code and let me know if u need any changes in this.Thank You
=================================

// Student.java

public class Student {
   private String lastName;
   private String firstName;

   public Student() {
       this.firstName = "foo";
       this.lastName = "bar";
   }

   public Student(String info) {
       String arr[] = info.split("/");
       this.firstName = arr[0];
       this.lastName = arr[1];
   }

   /**
   * @return the lastName
   */
   public String getLastName() {
       return lastName;
   }

   /**
   * @return the firstName
   */
   public String getFirstName() {
       return firstName;
   }

   /* (non-Javadoc)
   * @see java.lang.Object#toString()
   */
   @Override
   public String toString() {
       String s="";
       if(firstName.equals("foo") && lastName.equals("bar"))
       {
           s+=firstName+"."+lastName+".";
       }
       else      
       s=firstName.charAt(0)+"."+lastName.charAt(0)+".";
       return s;
   }

  
}

===============================

// Classroom.java

public class Classroom {
   private Student seats[][] = null;

   public Classroom(int rowNum, int columnNum) {
       this.seats = new Student[rowNum][columnNum];
       for(int i=0;i        {
           for(int j=0;j            {
               seats[i][j]=new Student();
           }
       }
   }
  
   private Student getStudentAt (int row, int col)
   {
       return seats[row][col];
   }
  
   public boolean setStudentAt (int row, int col, Student data)
   {
      
       if(seats[row][col].getFirstName().equals("foo") && seats[row][col].getLastName().equals("bar"))
       {
           seats[row][col]=data;
           return true;
       }
       else
       {
           return false;
       }
   }
  
   public boolean isValid (int row, int col)
   {
       if(row<0 || row>seats.length-1)
       {
           return false;
       }
       else if(col<0 || col>seats[0].length-1)
       {
           return false;
       }
       else
       {
           return true;
       }
   }
  
   public String toString()
   {
       String s="The current seating:\n";
       for(int i=0;i        {
           for(int j=0;j            {
              
               s+=seats[i][j].toString()+" ";
           }
           s+="\n";
       }
      
       return s;
   }
}

================================

// HomeworkTwo.java

import java.util.Scanner;

public class HomeworkTwo {

public static void main(String[] args) {

Classroom classroom;
Student data;
int row, col, rowNum, columnNum;
String info;
Scanner scan = new Scanner(System.in);

System.out.println ("How many rows do you want?");
rowNum = scan.nextInt();

System.out.println ("How many columns do you want?");
columnNum = scan.nextInt();

classroom = new Classroom(rowNum, columnNum);

System.out.println ("Capture a student information (name/lastname) or enter \"Q\" to quit.");
info = scan.next();

while (!info.equalsIgnoreCase("Q")) {

           data = new Student(info);

          
System.out.println("Capture the row number where the student wants to sit: ");
row = scan.nextInt();
System.out.println("Capture the column number where the student wants to sit: ");
col = scan.nextInt();

  
if (classroom.isValid(row, col) == false) {
System.out.println("\n row or column number is not valid.");
System.out.println("A student " + data.getFirstName() + " " + data.getLastName() + " is not assigned to a seat.");
} else {
  
if (classroom.setStudentAt(row, col, data) == true) {
System.out.println("\n The seat at row " + row + " and column " + col + " is assigned to " + data.toString());
System.out.println(classroom);
} else {
System.out.println("\n The seat at row " + row + " and column " + col + " is taken.");
}
}

// Read the next studentInfo
System.out.println ("Capture a student information (name/lastname) or enter \"Q\" to quit.");
info = scan.next();
}

scan.close();
}
}

===============================

output:

How many rows do you want?
3
How many columns do you want?
3
Capture a student information (name/lastname) or enter "Q" to quit.
Mickey/Mouse
Capture the row number where the student wants to sit:
1
Capture the column number where the student wants to sit:
2

The seat at row 1 and column 2 is assigned to M.M.
The current seating:
foo.bar. foo.bar. foo.bar.
foo.bar. foo.bar. M.M.
foo.bar. foo.bar. foo.bar.

Capture a student information (name/lastname) or enter "Q" to quit.
Daisy/Duck
Capture the row number where the student wants to sit:
2
Capture the column number where the student wants to sit:
0

The seat at row 2 and column 0 is assigned to D.D.
The current seating:
foo.bar. foo.bar. foo.bar.
foo.bar. foo.bar. M.M.
D.D. foo.bar. foo.bar.

Capture a student information (name/lastname) or enter "Q" to quit.
Clarabelle/Cow
Capture the row number where the student wants to sit:
2
Capture the column number where the student wants to sit:
1

The seat at row 2 and column 1 is assigned to C.C.
The current seating:
foo.bar. foo.bar. foo.bar.
foo.bar. foo.bar. M.M.
D.D. C.C. foo.bar.

Capture a student information (name/lastname) or enter "Q" to quit.
Max/Goof
Capture the row number where the student wants to sit:
0
Capture the column number where the student wants to sit:
0

The seat at row 0 and column 0 is assigned to M.G.
The current seating:
M.G. foo.bar. foo.bar.
foo.bar. foo.bar. M.M.
D.D. C.C. foo.bar.

Capture a student information (name/lastname) or enter "Q" to quit.
Horace/Horsecollar
Capture the row number where the student wants to sit:
5
Capture the column number where the student wants to sit:
1

row or column number is not valid.
A student Horace Horsecollar is not assigned to a seat.
Capture a student information (name/lastname) or enter "Q" to quit.
Sylvester/Shyster
Capture the row number where the student wants to sit:
2
Capture the column number where the student wants to sit:
0

The seat at row 2 and column 0 is taken.
Capture a student information (name/lastname) or enter "Q" to quit.
Snow/White
Capture the row number where the student wants to sit:
-1
Capture the column number where the student wants to sit:
0

row or column number is not valid.
A student Snow White is not assigned to a seat.
Capture a student information (name/lastname) or enter "Q" to quit.
Jiminy/Criket
Capture the row number where the student wants to sit:
0
Capture the column number where the student wants to sit:
2

The seat at row 0 and column 2 is assigned to J.C.
The current seating:
M.G. foo.bar. J.C.
foo.bar. foo.bar. M.M.
D.D. C.C. foo.bar.

Capture a student information (name/lastname) or enter "Q" to quit.
Q

=====================Could you plz rate me well.Thank You