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A class of Students was previously defined with the following properties: a string name, an integer age, a Boolean variable indicating whether or not the student is an IT major, and a character gender. 2 constructors were also defined: one default constructor and one constructor that takes the name, age, major, and gender to set the data fields. The instance methods were also defined, including the getters and setters. Two instances of the student class were also created; one with set values, and the other taking data from the user. For this activity, you will: Create an instance method called displayInfo(), that will use the getters and setters to print the instance data. Create a running class in which you’ll paste the 2 instances of student class created in the previous activity, then call the displayInfo() method to print then You want to track the number of students enrolled. Modify your Student class to include that variable and a method to get it. Your running class should: Display the current number of students enrolled; that is, print the number of students after each instance is created, along with new student information You are to create one more student, taking data from the user.

track the number of students enrolled. Modify your Student class to include that variable and a method to get it.

Respuesta :

Answer:

The Java program is explained below

Explanation:

###################################################

public class Student

{

  private String name;

  private int age;

  private Boolean IT_major;

  private char gender;

  public static int num; //static variable for number of students

  public Student() //default constructor

  {

      name = "Jon Doe";

      age = 0;

      IT_major = false;

      gender = '\u0000';

      num++;

  }

  public Student(String name,char gender) //parameterized constructor

  {

      this.name = name;

      this.gender = gender ;

      num++;

  }

  public void setAge(int Birth_year,int Current_year) //set age by sending birth year and current year

  {

      age = Current_year - Birth_year;

  }

  public int getAge()

  {

      return age;

  }

  public void setIT_Major(String major)

  {

      IT_major = Is_IT_major(major); //call Is_IT_major()

  }

  public boolean Is_IT_major(String major) //check if student is IT_major

  {

      if(major.equalsIgnoreCase("IT")|| major.equalsIgnoreCase("Information Technology"))

          return true;

      else

          return false;

  }

  public Boolean getIT_major()

  {

      return IT_major;

  }

 

  public String getName(){

      return name;

  }

 

  public char getGender(){

      return gender;

  }

  public String toString() //override toString()

  {

      return "\nStudent Details: \nName :"+name+" \nAge : "+ getAge()+ "\ngender : "+gender +"\nIs IT Major : "+getIT_major();

  }

 

  public void displayInfo(){

      System.out.println("Name: "+getName());

      System.out.println("Age: "+getAge());

      System.out.println("Gender: "+getGender());

      System.out.println("Is It Major: "+getIT_major());

  }

}

##############################################################

import java.time.LocalDate;

public class Test

{

  public static void main (String[] args)

  {

      LocalDate d = LocalDate.of(2017, 04, 07); // LocalDate object

      int Current_year = d.getYear();

      Student s = new Student("Christina Lewis",'f');

      s.setIT_Major("It");

      s.setAge(2000,Current_year);

      s.displayInfo();

      System.out.println("Number of students :"+s.num);

     

      System.out.println();

      Student s1 = new Student("Alex Bob",'m');

      s1.setIT_Major("It");

      s1.setAge(2000,Current_year);

      s1.displayInfo();

      System.out.println("Number of students :"+s.num);

  }

}

/*

Sample run:

Name: Christina Lewis

Age: 17

Gender: f

Is It Major: true

Number of students :1

Name: Alex Bob

Age: 17

Gender: m

Is It Major: true

Number of students :2

*/

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