我在小医院系统中为患者设置了一个ArrayList，需要编写一种方法来更新患者信息。此方法应采用名为“id”的整数，将此id与Patient ArrayList中的所有id匹配，并更改该对象中的某些信息。我该如何迭代这个列表？感谢。
这是我的病人类
import java.util.ArrayList;
import java.util.List;
public class Patient {
String strName,strSurname,strAddress,strDepartment,strGender;
int iId,iClass,iDob;
List<Entry> entries = new ArrayList<Entry>();
long longTel;
boolean boolAllergy,boolChronicDisease,boolRegularMedicine;
public boolean isBoolAllergy() {
return boolAllergy;
}
public void setBoolAllergy(boolean boolAllergy) {
this.boolAllergy = boolAllergy;
}
public boolean isBoolChronicDisease() {
return boolChronicDisease;
}
public void setBoolChronicDisease(boolean boolChronicDisease) {
this.boolChronicDisease = boolChronicDisease;
}
public boolean isBoolRegularMedicine() {
return boolRegularMedicine;
}
public void setBoolRegularMedicine(boolean boolRegularMedicine) {
this.boolRegularMedicine = boolRegularMedicine;
}
public String getStrName() {
return strName;
}
public void setStrName(String strName) {
this.strName = strName;
}
public String getStrSurname() {
return strSurname;
}
public void setStrSurname(String strSurname) {
this.strSurname = strSurname;
}
public String getStrAddress() {
return strAddress;
}
public void setStrAddress(String strAddress) {
this.strAddress = strAddress;
}
public String getStrDepartment() {
return strDepartment;
}
public void setStrDepartment(String strDepartment) {
this.strDepartment = strDepartment;
}
public int getiId() {
return iId;
}
public void setiId(int iId) {
this.iId = iId;
}
public long getlongTel() {
return longTel;
}
public void setiTel(long iTel) {
this.longTel = iTel;
}
public int getiClass() {
return iClass;
}
public void setiClass(int iClass) {
this.iClass = iClass;
}
public int getiDob() {
return iDob;
}
public void setiDob(int iDob) {
this.iDob = iDob;
}
public String getStrGender() {
return strGender;
}
public void setStrGender(String strGender) {
this.strGender = strGender;
}
public void Details() {
System.out.println("*********************************");
System.out.println("Patient Id: " + getiId());
System.out.println("Name: " + getStrName() + " Surname: " + getStrSurname());
System.out.println("Address: " + getStrAddress() + " Department: " + getStrDepartment() + " Gender: " + getStrGender());
System.out.println("Class: " + getiClass() + " Date of birth: " + getiDob() + " Tel: " + getlongTel());
System.out.println("Chronical Disease? " + isBoolChronicDisease());
System.out.println("Any Allergy? " + isBoolAllergy());
System.out.println("Using regular drugs?" + isBoolRegularMedicine());
System.out.println("*********************************");
}
}
这是使用Patient类的主要类
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Scanner;
public class Main {
static List<Doctor> listDoctors = new ArrayList<Doctor>();
static List<Nurse> listNurses = new ArrayList<Nurse>();
static List<Patient> listPatients = new ArrayList<Patient>();
static String strUserName = "admin";
static String strPass = "password";
public static void main(String[] args) {
@SuppressWarnings("unused")
int iChoice;
boolean exit = false;
boolean boolAccess = Login();
if (boolAccess) {
while(!exit) {
iChoice = Menu();
switch(iChoice) {
case 1:
AddDoctor();
break;
case 2:
AddNurse();
break;
case 3:
AddPatient();
break;
case 4:
ListDoctors();
break;
case 5:
ListNurses();
break;
case 6:
ListPatients();
break;
case 8:
ChangeUserName();
break;
case 9:
ChangePass();
break;
//Hastalığa göre hastalar listelenecek
//Kronik hastlalıkları olan hastalar listelenecek
//Sigortasını yatırmayan hastalar listelenecek
//delete ve update olayları
//Hastaneye sevkedilen hastalar listelenecek
//Yatılı kalan hastalar listelensin
//Raporlu olan entryler listelenecek
//Kayıt girilirken eğer hasta ismi ilk defa giriliyorsa önce hasta kaydı yapın diye uyarı cıkacak
case 15:
exit = true;
break;
}
}
}
}
private static void ChangeUserName() {
Scanner scan = new Scanner(System.in);
if(Login()) {
System.out.println("Enter new User Name:");
strUserName = scan.next();
System.out.println("Saved..");
}
}
private static void ChangePass() {
Scanner scan = new Scanner(System.in);
if(Login()) {
System.out.println("Enter new Password:");
strPass = scan.next();
System.out.println("Saved..");
}
}
private static void ListNurses() {
Iterator<Nurse> it = listNurses.iterator();
while(it.hasNext()) {
Nurse nur = (Nurse) it.next();
nur.Details();
}
}
private static void ListPatients() {
Iterator<Patient> it = listPatients.iterator();
while(it.hasNext()) {
Patient patient = (Patient) it.next();
patient.Details();
}
}
public static boolean Login() {
Scanner scan = new Scanner(System.in);
System.out.println("Enter Username: ");
if(strUserName.contentEquals(scan.next())) {
System.out.println("Enter Password:");
if(strPass.contentEquals(scan.next())) {
return true;
}
else
System.out.println("Wrong password");
return Login();
}
System.out.println("Wrong user name");
return Login();
}
public static int Menu() {
Scanner scan = new Scanner(System.in);
System.out.println("Choose one of the following order:");
System.out.println("1.Enter new Doctor");
System.out.println("2.Enter new Nurse");
System.out.println("3.Enter new Patient");
System.out.println("4.List all doctors");
System.out.println("5.List all nurses");
System.out.println("6.List all patients");
System.out.println("8.Change user name");
System.out.println("9.Change password");
System.out.println("15.Exit");
return scan.nextInt();
}
private static void ListDoctors() {
Iterator<Doctor> it = listDoctors.iterator();
while(it.hasNext()) {
Doctor doc = (Doctor) it.next();
doc.Details();
}
}
private static void AddDoctor() {
Doctor doctor;
String strName,strSurname,strSpeciality;
int iSSN;
Scanner scan = new Scanner(System.in);
System.out.println("Enter name:");
strName=scan.next();
System.out.println("Enter surname:");
strSurname = scan.next();
System.out.println("Enter speciality");
strSpeciality = scan.next();
System.out.println("Enter SSN");
iSSN = scan.nextInt();
doctor = new Doctor(strName,strSurname,strSpeciality,iSSN);
listDoctors.add(doctor);
System.out.println("Saved..");
}
private static void AddNurse() {
Nurse nurse;
String strName,strSurname;
int iSSN;
Scanner scan = new Scanner(System.in);
System.out.println("Enter name:");
strName=scan.next();
System.out.println("Enter surname:");
strSurname = scan.next();
System.out.println("Enter SSN");
iSSN = scan.nextInt();
nurse = new Nurse(strName,strSurname,iSSN);
listNurses.add(nurse);
System.out.println("Saved..");
}
private static void AddPatient() {
Patient patient = new Patient();
Scanner scan = new Scanner(System.in);
System.out.println("Enter name:");
patient.setStrName(scan.next());
System.out.println("Enter surname:");
patient.setStrSurname(scan.next());
System.out.println("Enter date of birth(DDMMYYYY)");
patient.setiDob(scan.nextInt());
System.out.println("Enter address:");
patient.setStrAddress(scan.next());
System.out.println("Enter department:");
patient.setStrDepartment(scan.next());
System.out.println("Enter gender:");
patient.setStrGender(scan.next());
System.out.println("Enter Telephone number:");
patient.setiTel(scan.nextLong());
System.out.println("Enter id:");
patient.setiId(scan.nextInt());
System.out.println("Enter class:");
patient.setiClass(scan.nextInt());
System.out.println("Does patient have any chronical disease? (Y/N)");
if(scan.next().contentEquals("Y"))
patient.setBoolChronicDisease(true);
else
patient.setBoolChronicDisease(false);
System.out.println("Does patient use any regular drugs? (Y/N)");
if(scan.next().contentEquals("Y"))
patient.setBoolRegularMedicine(true);
else
patient.setBoolRegularMedicine(false);
System.out.println("Does patient have any allergies?");
if(scan.next().contentEquals("Y"))
patient.setBoolAllergy(true);
else
patient.setBoolAllergy(false);
listPatients.add(patient);
}
private static void SearchPatientById(int id) {
Iterator<Patient> it = listPatients.iterator();
while(it.hasNext()) {
Patient patient = (Patient) it.next();
if(it.next().getiId() == id)
patient.Details();
}
}
}
答案 0 :(得分：2)
稍微修改一下，您的searchPatientById就可以返回找到的患者对象：
private static Patient searchPatientById(int id) {
Iterator<Patient> it = listPatients.iterator();
while(it.hasNext()) {
Patient patient = (Patient) it.next();
if(patient.getiId() == id)
return patient;
}
// if not found return null
return null;
}
请注意，我删除了对next()的双重通话
这样，您可以执行类似
Patient foundPatient = searchPatientById(idToFind);
if (foundPatient != null) {
foundPatient.setBoolAllergy(patientsAllergyState);
} else {
// whatever you need to do if the patient cannot be found
}
另请注意，在Java中，将变量类型编码为变量名称并不常见，但是普遍遵循naming convention