Java实例化求助

Question

package com.dh.hrmanager.util;
import java.util.Scanner;
import com.dh.hrmanager.entity.*;import com.dh.hrmanager.entity.Employee;public class StartHr {
public static void main(String[] args) {

Employee staff = new Employee(1,"DH001","Staff","Staff",2,1,3000.5);//用户名为第三个，密码为第四个
Employee manager = new Employee(2,"DH002","Manager","Manager",2,2,6000.5);
Employee admin = new Employee(3,"DH003","Admin","Admin",2,3,4000.5);
HrHelper helper = new HrHelper();
Data.init();
Menu menu  = new Menu();
menu.showLoginMenu();
boolean flag = true;
Scanner input = new Scanner(System.in);
while(flag) {
int choice = input.nextInt();
switch(choice) {
case 1:
System.out.println("请输入用户名：");
String userName = input.next();
System.out.println("请输入密码：");
String password = input.next();
Employee emp = helper.login(userName, password);
if(userName.equals(staff.getUserName())&&password.equals(staff.getPassword()))
menu.showStaffMenu();
else if(userName.equals(manager.getUserName())&&password.equals(manager.getPassword()))
menu.showManagerMenu();
else if(userName.equals(admin.getUserName())&&password.equals(admin.getPassword()))
menu.showAdminMenu();
else
System.out.println("用户名或者密码不正确"
+ "请重新输入数字：");
break;
case 2:
System.out.println("本功能将在后面实践篇实现，"
+ "请选择其它选项");
menu.showLoginMenu();
break;
case 3:
flag = false;
System.out.println("您退出了系统！");
break;
default:
System.out.println("输入选项不正确，请重新输入数字：");}
if(!flag)
break;
}



}}
求教大神Employee显示没出错，运行时这里面的Employee显示不能实例化，我该怎么改                Employee staff = new Employee(1,"DH001","Staff","Staff",2,1,3000.5);//用户名为第三个，密码为第四个
Employee manager = new Employee(2,"DH002","Manager","Manager",2,2,6000.5);
Employee admin = new Employee(3,"DH003","Admin","Admin",2,3,4000.5);

Answer 1

没Employee的代码，怎么知道原因在哪？

Answer 2

Employee的代码一并粘上来吧

Answer 3

public abstract class Employee {
public Employee(int userId, String empNo,String userName,String password,int departId,int roleId,double salary) {
this.userId = userId;
this.empNo = empNo;
this.userName = userName;
this.password = password;
this.departId = departId;
this.roleId = roleId;
this.salary = salary;
}
/**
 * 
 * 显示员工信息
 */
public void displayInfo() {
String position = null;
if(roleId == 1) {
position = "Staff";}
if(roleId == 2) {
position = "Manager";
}
if(roleId == 3) {
position = "Admin";
}
String department = null;
if(departId == 1)department = "市场部";
if(departId == 2)department = "开发部";
if(departId == 3)department = "信息部";
System.out.println("\t\t当前用户信息\n\n");
System.out.println("*********************************");
System.out.println("\t\t雇员编号： "+empNo);
System.out.println("\t\t姓名："+userName);
System.out.println("\t\t职务："+position);
System.out.println("\t\t部门： "+department);
System.out.println("\t\t薪水:"+String.valueOf(salary));
System.out.println("**********************************");
}
/**
 * 
 * 修改密码
 * 
 * @param newPassword
 */
public void modifyPassword(String newPassword) {
this.password = newPassword;
System.out.println("修改密码成功");

}
private int userId;
private String userName;
private String password;
private int roleId;
private String empNo;
private int departId;
private double salary;
public int getUserId() {
return userId;
}
public void setUserId(int userId) {
this.userId = userId;
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public int getRoleId() {
return roleId;
}
public void setRoleId(int roleId) {
this.roleId = roleId;
}
public String getEmpNo() {
return empNo;
}
public void setEmpNo(String empNo) {
this.empNo = empNo;
}
public int getDepartId() {
return departId;
}
public void setDepartId(int departId) {
this.departId = departId;
}
public double getSalary() {
return salary;
}
public void setSalary(double salary) {
this.salary = salary;
}
public abstract void displaySalaryRange();}
这是Employee 的

Answer 4

Employee没有无参构造

Answer 5

你Employee定义的是抽象类，怎么可以直接用new 实例化抽象类实例化方法有2种 1。是先写个子类继承，然后在子类中重写 把父类的抽象方法重写为可以实现的方法。2.是用内部匿名类，也需要在匿名类中重写抽象方法。