Using Java Define a class of Students with the following properties and actions:
ID: 3857352 • Letter: U
Question
Using Java Define a class of Students with the following properties and actions: a string name, an integer age, a Boolean variable indicating whether or not the student is an IT major, a character gender, and an integer that tracks the number of students.
The default value for name is “Jon Doe”, for age is 0, for the Boolean variable is false, and for the gender is ‘u0000’.
To compute the student’s age, the year of birth and the current year must be used. The year of birth is provided as parameter. The current year is a class variable obtained thru an instance of LocalDate.
The student’s name and gender are set to the values provided.
To set the Boolean value, we use a support method that takes the student’s major and return true if the major is “IT”, and false otherwise. The setter for this data field must call the support method. Note that the parameter provided could be any case-variation of “IT” (e.g. “it”, “It”, “iT”), or any case-variation of “Information Technology”.
Create an instance method called toString(), that will use the getters and setters to create a String of the instance data (Note that this is similar to the displayInfo() method, except that the data is not printed)
Create a TestStudent class in which you’ll create instances:
Create a student instance with default values Repeatedly asks the user for the student’s name, birthyear, gender, and major, until the user enters “DONE” to indicate no more student to enter For each student entered, create an instance of the Student class. Print the total number of Students in the class Call the toString() method to print the data for each instance.
Explanation / Answer
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 " Student Details: Name :"+name+" Age : "+ getAge()+ " gender : "+gender +" Is 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 StudentTest
{
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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