Udemy_30_Person

public class Person {
    private String firstName;
    private String lastName;
    private int age;

    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 getAge() {
        return age;
    }

    public void setAge(int age) {
        if (age<0 ||age>100) {
            this.age=0;
        }
        else this.age = age;
    }

    public boolean isTeen() {
        if(getAge()>12 && getAge()<20) {
            return true;
        } else return false;
    }

    public String getFullName(){
        if(getFirstName().isEmpty() && getLastName().isEmpty()) return "";
        if (getLastName().isEmpty()) return getFirstName();
        if (getFirstName().isEmpty())return getLastName();
        else return getFirstName()+" "+getLastName();
    }
}