我正在尝试使用Scanner对象来接收用户输入，然后该输入将归因于名为TargetHeartRateCalculator的对象的以下值。
TargetHeartRateCalculator 采用构造函数参数。
字符串 fName， 字符串 lName， int month， int day， int year.
通常不使用扫描仪，我只会手动使用参数实例化对象，例如......
TargetHeartRateCalculator patient1 = new TargetHeartRateCalculator("Tom", "Willickers", 01, 25, 1966);
我需要使用扫描仪来获取用户输入，然后从用户收到的输入中将值分配给 fName、lName、月、日、年。
我尝试通过语法使对象实例化成为通过 Scanner 对象分配用户输入的一部分是不正确的，我什至不确定这是否是你应该做这样的事情的方式。
我觉得这可能是一个简单的解决方案，但答案对我来说是相当模糊的。
这是我的驱动程序类...
import java.util.Scanner;
public class DriverClass {
//--------------------------------------------------------------------------------------
// TARGET HEART RATE CALCULATOR CLASS FUNCTIONALITY TEST
//--------------------------------------------------------------------------------------
TargetHeartRateCalculator patient1 = new TargetHeartRateCalculator("Tom", "Willickers", 01, 25, 1966);
TargetHeartRateCalculator patient2 = new TargetHeartRateCalculator("Bill", "Skarsgard", 8,9, 1990);
//Write a java app that prompts for the persons information
//instantiates an object and prints the information from that object
//first name, last name, date of birth,
// calculates maximum heart rate, and target heart rate.
//and then displays them to the them.
Scanner input = new Scanner(System.in);
System.out.print("Please enter your first name: ");
String fnInput = input.nextDouble();
System.out.printf("%nThank you %s %s. Your date of birth is %n" +
"%d and you are %d years old!%n" +
"Your maximum heart rate is %.2f and your %n" +
"Target Heart Rate range is %.2f%n%n" get,
patientInfo(patient1);
patientInfo(patient2);
displayAgeYears(patient1);
displayAgeYears(patient2);
displayMaxHeartRate(patient1);
displayMaxHeartRate(patient2);
displayTargetHeartRate(patient1);
displayTargetHeartRate(patient2);
}
}
这是我的班级
import java.time.LocalDateTime;
public class TargetHeartRateCalculator {
private String fName;
private String lName;
private int dOB;
private int bMonth;
private int bDay;
private int bYear;
private int ageYears;
private double maxHeartRate;
private double lowTargetHearRate;
private double highTargetHearRate;
LocalDateTime now = LocalDateTime.now();
int cYear = now.getYear();
int cMonth = now.getMonthValue();
int cDay = now.getDayOfMonth();
//constructor
public TargetHeartRateCalculator(String fNameIn, String lNameIn, int monthIn, int dayIn, int yearIn) {
fName = fNameIn;
lName = lNameIn;
bMonth = monthIn;
bDay = dayIn;
bYear = yearIn;
}
public String getfName() {
return fName;
}
public void setfName(String fName) {
this.fName = fName;
}
public String getlName() {
return lName;
}
public void setlName(String lName) {
this.lName = lName;
}
public int getBMonth() {
return bMonth;
}
public void setBMonth(int month) {
this.bMonth = month;
}
public int getBDay() {
return bDay;
}
public void setBDay(int day) {
this.bDay = day;
}
public int getBYear() {
return bYear;
}
public void setBYear(int year) {
this.bYear = year;
}
public int getAgeYear(){
int currentAgeYear = cYear -bYear;
return currentAgeYear;
}
public int getAgeMonth(){
int currentAgeMonth =cMonth - bMonth;
return currentAgeMonth;
}
public int getAgeDay(){
int currentAgeDay =cDay - bDay;
return currentAgeDay;
}
public String getdOB(TargetHeartRateCalculator patient) {
String dOB = String.format("%s/%s/%s",
patient.getBMonth(), patient.getBDay(), patient.getBYear());
return dOB;
}
public void setdOB(int dOB) {
this.dOB = dOB;
}
public static String displayAgeYears(TargetHeartRateCalculator patient) {
String ageYears = String.format("%s %s is %s Years old",
patient. getfName(), patient.getlName(), patient.getAgeYear());
return ageYears;
}
public void setAgeYears(int ageYears) {
this.ageYears = ageYears;
}
public double getMaxHeartRate() {
double maxHeartRate = (220 - getAgeYear()) ;
return maxHeartRate;
}
public void setMaxHeartRate(int maxHeartRate) {
this.maxHeartRate = maxHeartRate;
}
public double getLowTargetHearRate() {
lowTargetHearRate = getMaxHeartRate() * .5;
return lowTargetHearRate;
}
public void setLowTargetHearRate(int lowTargetHearRate) {
this.lowTargetHearRate = lowTargetHearRate;
}
public double getHighTargetHeartRate(){
highTargetHearRate = getMaxHeartRate() * .85;
return highTargetHearRate;
}
public void setHighTargetHearRate(){
this.highTargetHearRate = highTargetHearRate;
}
public static String displayTargetHeartRate(TargetHeartRateCalculator patient){
String hRateRange = String.format("%.2f BPM - %.2f BPM", patient.getLowTargetHearRate(), patient.getHighTargetHeartRate());
return hRateRange;
}
public static String displayMaxHeartRate(TargetHeartRateCalculator patient){
String mHeartRate = String.format("%.2f BPM", patient.getMaxHeartRate());
return mHeartRate;
}
public static String patientInfo(TargetHeartRateCalculator patient) {
String result = String.format("Patient Name: %s %s DOB: %d/%d/%d",
patient.getfName(), patient.getlName(), patient.getBMonth(), patient.getBDay(), patient.getBYear());
return result;
}
}
> 您应该读取构造TargetHeartRateCalculator实例所需的所有变量。
System.out.print("Please enter your first name: ");
String firstName = input.next();
System.out.print("Please enter your lastname: ");
String lastName = input.next();
System.out.print("Please enter your birthday day: ");
String birthdayDay = input.nextInt();
System.out.print("Please enter your birthday month: ");
String birthdayMonth = input.nextInt();
System.out.print("Please enter your birthday year: ");
String birthdayYear = input.nextInt();
TargetHeartRateCalculator patient = TargetHeartRateCalculator(firstName, lastName,
birthdayDay, birthdayMonth, birthdayYear);
然后，您可以在初始化TargetHeartRateCalculator后调用静态方法。
TargetHeartRateCalculator.displayTargetHeartRate(patient);
但是，与其将所有内容放入类并在TargetHeartRateCalculator中使用静态方法，不如将TargetHeartRateCalculator分为两部分，可以是Patient和TargetHeartRateCalculator。
患者类可以是这样的：
import java.time.LocalDateTime;
public class Patient {
private String fName;
private String lName;
private int dOB;
private int bMonth;
private int bDay;
private int bYear;
private int ageYears;
private int currentYear = LocalDateTime.now().getYear();
private int currentMonth = LocalDateTime.now().getMonthValue();
private int currentDay = LocalDateTime.now().getDayOfMonth();
public Patient(String fName, String lName, int bMonth, int bDay, int bYear) {
this.fName = fName;
this.lName = lName;
this.bMonth = bMonth;
this.bDay = bDay;
this.bYear = bYear;
}
public String getfName() {
return fName;
}
public void setfName(String fName) {
this.fName = fName;
}
public String getlName() {
return lName;
}
public void setlName(String lName) {
this.lName = lName;
}
public int getbMonth() {
return bMonth;
}
public void setbMonth(int bMonth) {
this.bMonth = bMonth;
}
public int getbDay() {
return bDay;
}
public void setbDay(int bDay) {
this.bDay = bDay;
}
public int getbYear() {
return bYear;
}
public void setbYear(int bYear) {
this.bYear = bYear;
}
public int getAgeYear(){
return currentYear -bYear;
}
public int getAgeMonth(){
return currentMonth - bMonth;
}
public int getAgeDay(){
return currentDay - bDay;
}
}
计算将在另一个类中，该类将对象作为参数Patient并进行计算。
如果我理解正确，您正在尝试将输入到构造函数中吗？我将显示一个字段，因为其余字段都相同
Scanner input = new Scanner(System.in);
System.out.print("Please enter your first name: ");
String fnInput = input.nextLine();
// repeat print and scan, as needed
TargetHeartRateCalculator patient1 = TargetHeartRateCalculator(fnInput); // add more parameters
然后，您需要实例方法，而不是带有参数的静态方法。
public void patientInfo() {
System.out.printf("%s%n", this.getfName()); // for example
}
你像这样称呼这些方法
patient1.patientInfo();
我认为您应该从主方法中删除打印语句