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我刚刚进入Java，我很快就要为我的课程准备一个项目，并继续运行相同的错误。我要创建一个学生，教师，员工目录，可以添加新条目，更新它们，并使用String（）方法打印它们。我被推荐使用一个treeMap集合。错误涉及.getKey（）方法，无法找到它。我将包括我的代码，并将非常感谢任何意见，以帮助我弄清楚这一点。先谢谢你。Java中的学生，教师，职员目录
import java.util.TreeMap;
import java.util.*;
import java.util.Map.Entry;
import java.util.Iterator;
import java.util.Map;
/**
* Write a description of class Persons here.
*
* @author (your name)
* @version (a version number or a date)
*/
public class Directory {
private String firstName, lastName;
private TreeMap<String, Persons> schoolDirectory;
private int numberInDirectory;
public Directory() {
schoolDirectory = new TreeMap<String, Persons>();
}
public String getKey() {
return lastName + firstName;
}
public void addPerson(Persons newPersons) {
schoolDirectory.put(Persons.getKey(), newPersons);
numberInDirectory++;
}
public void addPerson(Staff newStaff) {
schoolDirectory.put(newStaff.getKey(), newStaff);
numberInDirectory++;
}
public int getNumber() {
return numberInDirectory;
}
public class Persons {
// instance variables - replace the example below with your own
private String firstName;
private String lastName;
private String email;
}
}
/**
* Write a description of class People here.
*
* @author (your name)
* @version (a version number or a date)
*/
public class People extends Directory {
private String firstName, lastName, emailAddress, phoneNumber, ID;
public People(String firstName, String lastName, String emailAddress, String phoneNumber, String ID) {
this.firstName = firstName;
this.lastName = lastName;
this.emailAddress = emailAddress;
this.phoneNumber = phoneNumber;
this.ID = ID;
}
public String getKey() {
return lastName + firstName;
}
}
/**
* Write a description of class Students here.
*
* @author (your name)
* @version (a version number or a date)
*/
public class Students extends People {
// instance variables - replace the example below with your own
private String classlevel;
private int SudentID;
}
/**
* Write a description of class Faculty here.
*
* @author (your name)
* @version (a version number or a date)
*/
public class Faculty extends People {
private String RoomNumber;
private String EmployeeStatus;
private String ProgramOfInstruction;
public Faculty(String firstName, String lastName, String emailAddress, String phoneNumber, String ID, String room, String status, String instruction) {
super(firstName, lastName, emailAddress, phoneNumber, ID);
RoomNumber = room;
EmployeeStatus = status;
ProgramOfInstruction = instruction;
}
}
/**
* Write a description of class Staff here.
*
* @author (your name)
* @version (a version number or a date)
*/
public class Staff extends People {
private String OfficeNumber;
private String JobTitle;
public Staff(String firstName, String lastName, String emailAddress, String phoneNumber, String ID, String office, String position) {
super(firstName, lastName, emailAddress, phoneNumber, ID);
OfficeNumber = office;
JobTitle = position;
}
}
你得到的* exact *错误信息是什么？ – awksp
无法找到符号 - 方法getKey（） – user3758442
您已经张贴了太多的代码。请阅读[如何创建一个最小，完整和可验证的示例]（http://stackoverflow.com/help/mcve）指出发生此错误的位置也很方便。 – PakkuDon