对象第二个员工不在

Question

我写了一些代码，我想要一些帮助这个关于公司的程序

这是一个主要的：

Employee e1=new Employee (43208931,"Zainab","Directer","14/5/1990",15000);
    Employee e2=new Employee (43208932,"Ahmed","Maneger","14/5/1991",18000);
    Employee e3=new Employee (43208932,"Talal","Engeniar","14/5/1989",1000);
    Employee e4=new Employee (43208931,"khaled","software Engeniar","14/5/1978",6000);
    Employee e5=new Employee (43208931,"Mohammed","Director","14/5/1978",9000);
    Employee e6=new Employee (43208931,"Jalel","software Designer","14/5/1978",8000);


     Department d1;
     Department d2;
     Department d3;

    d1 = new Department (e1 , e3 , "Jeddah Branch");
    d2 = new Department (e2 , e4 ,"Hail Branch");
    d3 = new Department (e5 , e6 ,"Musqet Branch"); 

     Project p1=new Project (d3,"Bank System");
     Project p2 = new Project (d2,"Employee System");
     Project p3=new Project (d1,"Student System");
     System.out.println(p1.toString());
     System.out.println(p2.toString());
     System.out.println(p3.toString());

这是class Employee：`Public class Employee{private long ID；private String Name；private String Position；private

Employee(){

}
public Employee(long ID, String Name, String position, String DateOfBirth, double Salary) {
    this.ID = ID;
    this.Name = Name;
    this.position = position;
    this.DateOfBirth = DateOfBirth;
    this.Salary = Salary;
}

public long getID() {
    return ID;
}

public String getName() {
    return Name;
}

public String getPosition() {
    return position;
}

public String getDateOfBirth() {
    return DateOfBirth;
}

public double getSalary() {
    return Salary;
}

@Override
public String toString() {
    return "Employee{" + "ID=" + ID + ", Name=" + Name + ", position=" + position + ", DateOfBirth=" + DateOfBirth + ", Salary=" + Salary + '}';
}


`

这是类Department：`public class Department extends Employee{Employee

Department(){

}



public Department(Employee Employee,Employee E, String DName) {
    this.Employee = E;
    this.Employee = Employee;
    this.DName = DName;

}

public Department(Employee Employee, Employee E,String DName, long ID, String Name, String position, String DateOfBirth, double Salary) {
    super(ID, Name, position, DateOfBirth, Salary);
    this.Employee = Employee;
    this.DName = DName;

}



 public Employee getEmployee(){
     return Employee;}

 public String getDName(){
     return DName;
 }

@Override
public String toString() {
    return "\n Department:{" + DName + " }" +Employee +  '}';
}

}`

最后是类项目:`Public Class Project extends Department

Department Department ;
String projecttName;
Project(){

}

public Project(Department Department, String DepartmentName) {
    this.Department = Department;
    this.projecttName = DepartmentName;
}

public Project(Department Department, String DepartmentName, String DName) {
    this.Department = Department;
    this.projecttName = DepartmentName;
}

public Project(Department Department, String DepartmentName, commpany.Employee Employee, String DName, long ID, String Name, String position, String DateOfBirth, double Salary) {
    super(Employee,Employee , DName, ID, Name, position, DateOfBirth, Salary);
    this.Department = Department;
    this.projecttName = DepartmentName;
}

public Department getDepartment() {
    return Department;
}

public String getDepartmentName() {
    return projecttName;
}

@Override
public String toString() {
    return "\n Project :" +projecttName+" {" + Department + '}';
}

}`我的问题是：同一部门的第二个员工不在打印中>>有什么问题？

Answer 1

你的问题就在这里

public class Department extends Employee { 
Employee Employee; 
private String DName;

    Department(){

    }



    public Department(Employee Employee,Employee E, String DName) {
        this.Employee = E;
        this.Employee = Employee;
        this.DName = DName;

    }

您只有一个实例字段employee（注意变量的名称以小写或下划线开头）。

执行此代码时

this.Employee = E;
this.Employee = Employee;

this.employee换句话说，它是您的私有变量，只需重写

解决方法是：两个实例变量employee1；员工E2

然后您的构造函数看起来就像

public Department(Employee e1,Employee e2, String DName) {
    this.e1 = e1;
    this.e2 = e2;
    this.DName = DName;

}

此外，如果要将两个以上的员工添加到特定部门，请使用列表 MyList 或数组

Answer 2

您将两个员工分配给同一个变量，这意味着一个员工将被丢弃

this.Employee = E;
this.Employee = Employee;

如果您想要相同的两个雇员，您必须保存这两个雇员，并在toString（）中打印这两个雇员。

提示：如果您想知道如何做到这一点，我建议您使用您的IDE生成这段代码。你不必自己写。；）