feb18_21_Person.java

/*   Created by IntelliJ IDEA.
 *   Author: Kshitij Varshney (kshitijvarshne1)
 *   Date: 18-Feb-21
 *   Time: 6:35 PM
 *   File: Person.java
 */

package feb18_21;

public class Person {
    private String firstName;
    private String lastName;
    private int birthMonth;
    private int birthDay;
    private int birthYear;

    public Person(String firstName, String lastName, int birthMonth, int birthDay, int birthYear) {
        this.firstName = firstName;
        this.lastName = lastName;
        this.birthMonth = birthMonth;
        this.birthDay = birthDay;
        this.birthYear = birthYear;
    }

    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    public int getBirthMonth() {
        return birthMonth;
    }

    public void setBirthMonth(int birthMonth) {
        this.birthMonth = birthMonth;
    }

    public int getBirthDay() {
        return birthDay;
    }

    public void setBirthDay(int birthDay) {
        this.birthDay = birthDay;
    }

    public int getBirthYear() {
        return birthYear;
    }

    public void setBirthYear(int birthYear) {
        this.birthYear = birthYear;
    }

    public void setBirthDate(int month, int day, int year) {
        if ((day >= 1 && day <= 31) && (month >= 1 && month <= 12) && (year >= 1900 && year <= 2019)) {
            if (month == 2 && (day >= 1 && day <= 28)) {
                this.birthDay = day;
                this.birthMonth = month;
                this.birthYear = year;
            } else {
                System.out.println("A/c to Febuary month , day is worng");
            }
        } else {
            System.out.println("Worng values input");
        }
    }

    public int computeAge() {
        int currentdate = 5;
        int currentMonth = 11;
        int currentYear = 2020;

        int[] month = {31, 28, 31, 30, 31, 30, 31,
                31, 30, 31, 30, 31};

        if (this.birthDay > currentdate) {
            currentMonth = currentMonth - 1;
            currentdate = currentdate + month[this.birthMonth - 1];
        }

        if (this.birthMonth > currentMonth) {
            currentYear = currentYear - 1;
            currentMonth = currentMonth + 12;
        }

        return currentYear - this.birthYear;
    }

    public boolean isAdult() {
        return computeAge() >= 18;
    }

    public void printDetails() {
        System.out.println(this.firstName + " " + this.lastName
                + " " + "born " + this.birthMonth + "/" + this.birthDay + "/" + birthYear + " age " +
                computeAge() + " " + (isAdult() ? "adult" : "minor"));
    }
}

feb18_21_PersonTest.java

/*   Created by IntelliJ IDEA.
 *   Author: Kshitij Varshney (kshitijvarshne1)
 *   Date: 18-Feb-21
 *   Time: 6:53 PM
 *   File: PersonTest.java
 */

package feb18_21;

public class PersonTest {
    public static void main(String[] args) {
        Person[] persons= new Person[4];
        persons[0]= new Person("Robin","Doe",12,1,1999);
        persons[1]= new Person("Pat","Smith",11,3,2002);
        persons[2]=new Person("Tyler","Willians",11,25,2002);
        persons[3]=new Person("Alex","Park",10,1,2019);
        for (int i = 0; i < 4; i++) {
            persons[i].printDetails();
        }
    }
}

feb18_21_README.md

#Output Screenshot