Question

Given the StudentIDDriver.java file, fill in the ‘gaps’ in the code (designated by insert code here that “exercises” (tests) the StudentID class by calling its methods.

There are six occurrences of ‘insert code here comments’. Above these are comments that help you understand what your code should accomplish.  

Don’t forget to comment your StudentIDDriver.java file

(including a prologue section at the top of the file).

Create a project in Eclipse for your StudentIdDriver.

Add another class for it StudentId

Sample session:

     Enter student name: Carol

Enter student id: 1234

Invalid student id - reenter: 123400

Carol, your new e-mail account is:

[email protected]

/**********************************************************

* StudentIdDriver.java

* Dean & Dean

*

* Exercise 6.12 driver

**********************************************************/

import java.util.Scanner;

public class StudentIdDriver

{

public static void main(String[] args)

{

    Scanner stdIn = new Scanner(System.in);

    StudentId myStudent;

    String name;

    // Instantiate StudentId object and assign it to student.

    <insert-code-here>                                                             

    System.out.print("Enter student name: ");

    name = stdIn.nextLine();

    // Assign name to the student object.

    <insert-code-here>                                                             

    System.out.print("Enter student id: ");

    // In a single statement, read an int for the id value,

    // and assign it to the student object.

    <insert-code-here>

   

    // If invalid id, execute the loop.

    // (Use the isValid method in the while loop condition.)

    while (<insert-code-here>)

    {

      System.out.print("Invalid student id - reenter: ");

      // In a single statement, read an int for the id value

      // and assign it to the student object.

      <insert-code-here>

    }

    System.out.println("\n" + name +

      ", your new e-mail account is: \n" +

     <insert-code-here>   ; // Get email account.

} // end main

} // end class StudentIdDriver

/**********************************************************

* StudentId.java

* Dean & Dean

*

* Exercise 6.12 driven class

**********************************************************/

public class StudentId

{

private String name;

private int id;

//*********************************************************

public void setName(String n)

{

    this.name = n;

}

public String getName()

{

    return this.name;

}

public void setId(int id)

{

    this.id = id;

}

public int getId()

{

    return this.id;

}

//*********************************************************

public String getEmailAccount()

{

    // Include "" in concatenation to convert to strings.

    return "" + this.name.charAt(0) + this.id +

    "@pirate.park.edu";

}

//*********************************************************

public boolean isValid()

{

    return this.id >= 100000 && this.id <= 999999;

}

} // end class StudentId

Answer 1

/**********************************************************
* StudentIdDriver.java
* Dean & Dean
*
* Exercise 6.12 driver
**********************************************************/

import java.util.Scanner;
public class StudentIdDriver
{
public static void main(String[] args)
{
Scanner stdIn = new Scanner(System.in);

StudentId myStudent;

String name;

// Instantiate StudentId object and assign it to student.
StudentId student = new StudentId();   

System.out.print("Enter student name: ");

name = stdIn.nextLine();

// Assign name to the student object.
   student.setName(name);   

System.out.print("Enter student id: ");

// In a single statement, read an int for the id value,
// and assign it to the student object.
   student.setId(stdIn.nextInt());

// If invalid id, execute the loop.
// (Use the isValid method in the while loop condition.)

while (!student.isValid())
{
System.out.print("Invalid student id - reenter: ");

// In a single statement, read an int for the id value
// and assign it to the student object.
student.setId(stdIn.nextInt());
}

System.out.println("\n" + name + ", your new e-mail account is: \n" +

student.getEmailAccount()) ; // Get email account.

} // end main

} // end class StudentIdDriver

/**********************************************************
* StudentId.java
* Dean & Dean
*
* Exercise 6.12 driven class
**********************************************************/

public class StudentId
{
//private data members
private String name;
private int id;
//*********************************************************
//method to set the name of the student
public void setName(String n)
{
this.name = n;
}

//method to return the name of the student
public String getName()
{
return this.name;
}

//method to set the id of the student
public void setId(int id)
{
this.id = id;
}

//method to return the id of the student
public int getId()
{
return this.id;
}

//*********************************************************
//method to create and return the new email account of the student
public String getEmailAccount()
{
// Include "" in concatenation to convert to strings.
return "" + this.name.charAt(0) + this.id +
"@pirate.park.edu";
}

//*********************************************************
//method to return true if id is valid, otherwise return false
public boolean isValid()
{
return this.id >= 100000 && this.id <= 999999;
}

} // end class StudentId

Output:

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