Java - Coding Challenge - Classes; Person

gistfile1.txt

public class Person {

    private String firstName;
    private String lastName;
    private int age;

    public String getFirstName(){
        return firstName;
    }
    public String getLastName(){
        return lastName;
    }
    public int getAge(){
        return age;
    }

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

    public boolean isTeen(){
        if ((age<13)||(age>19)){
            return false;
        }
        return true;
    }

    public String getFullName(){
        if (firstName.isEmpty()){
            return lastName;
        } else if (lastName.isEmpty()){
            return firstName;
        }
        return firstName+" "+lastName;
    }
}