my{} heartheateapp JAVA

/* HeartRates.java */

import java.util.*;
public class HeartRates {

private String firstName;
private String lastName;
private int month; //month of date of birth
private int day; //day of DOB
private int year; //year of DOB

//constructor
public HeartRates(String firstName,String lastName, int month, int day, int year){
this.firstName = firstName;
this.lastName = lastName;
this.month = month;
this.day = day;
this.year = year;
}

//setter methods
public void setFirstName(String value){
firstName = value;
}
public void setLastName(String value){
lastName = value;
}
public void setMonth(int value){
month = value;
}
public void setDay(int value){
day =value;
}
public void setYear(int value){
year =value;
}

//getter methods
public String getFirstName(){
return firstName;
}
public String getLastName(){
return lastName;
}
public int getMonth(){
return month;
}
public int getDay(){
return day;
}
public int getYear(){
return year;
}

//returns age of the person in years
public int getAge(){
Calendar cd = Calendar.getInstance();
return (cd.get(Calendar.YEAR)) - year;
}

//return maximum heart rate
public int maximumHeartRate(){
return 220 - getAge();
}

//displays the target herat rate range
public void targetHeartRate(){
System.out.print("Target Heart Rate Range: "+ maximumHeartRate() * 0.5 + " to "+ maximumHeartRate() * 0.85);
}
}