Java 代码有效，但不确定我是否满足要求（对象和类）

Question

我有这个作业要求，我已经为它写了一个解决方案。但不确定我是否得到了正确的答案。 代码工作并编译。

Question

这是我的 java 文件（2 个文件）

首先是主文件

public class Employee
{
String name;
int idNumber;
String department;
String position;

public Employee(String emName, int idNum, String depart, String pos)
{
    name = emName;
    idNumber = idNum;
    department= depart;
    position = pos;
}

public Employee(String emName, int idNum)
{
    name = emName;
    idNumber = idNum;
    department= "";
    position = "";
}

public Employee()
{
    name = "";
    idNumber = 0;
    department= "";
    position = "";
}

//set name
public void setName(String nameSet)
{
    name = nameSet;
}

//get name
public String getName()
{
    String nameGet = name;
    return nameGet;
}

//set idnum
public void setID(int idSet)
{
    idNumber = idSet;
}

//get idnum
public int getId()
{
    int idGet = idNumber;
    return idGet;
}

//
//set department
public void setDep(String depSet)
{
    department = depSet;
}

//get department
public String getDep()
{
    String depGet = department;
    return depGet;
}

//
//set position
public void setPos(String posSet)
{
    position = posSet;
}

//get position
public String getPos()
{
    String posGet = position;
    return posGet;
}

}

第二次添加数据并打印数据

       public class Employee_test
{
public static void main(String[] args)
{
    Employee employee1 = new Employee("Susan Meyers", 47899, "Accounting", "Vice President");
    Employee employee2 = new Employee("Mark Jones", 39119, "IT", "Programmer"); //use second with Mark
    //Employee employee2 = new Employee("Mark Jones", 39119);
    Employee employee3 = new Employee("Joy Rogers", 81774, "Manufacturing", "Engineer"); //use third with Joy
    //Employee employee3 = new Employee();

    System.out.println("Name           ID Number   Department     Position");
    System.out.println("");
    System.out.println(employee1.getName() + "   " + employee1.getId() +  "       " + employee1.getDep() + "     " + employee1.getPos());
    System.out.println(employee2.getName() + "     " + employee2.getId() +  "       " + employee2.getDep() + "             " + employee2.getPos());
    System.out.println(employee3.getName() + "     " + employee3.getId() +  "       " + employee3.getDep() + "  " + employee3.getPos());
    System.out.println("");
}

}

这是我运行 employee_test 文件时的输出。

Output terminal

我对什么感到困惑。

问题说

Make sure you use all three constructors. Use the first constructor with Susan, the second with Mark and the third one with Joy.

如果问题希望第二个员工使用只有（姓名，身份证号）的构造函数，而第三个员工什么都没有（），如何实现输出。 提前致谢。

Answer 1

使用setter填充其他数据：

Employee employee1 = new Employee("Susan Meyers", 47899, "Accounting", "Vice President");

Employee employee2 = new Employee("Mark Jones", 39119);
employee2.setDep("IT");
employee2.setPos("Programmer");

Employee employee3 = new Employee();
employee3.setName("Joy Rogers");
employee3.setID(81774);
employee3.setDep("Manufacturing");
employee3.setPos("Engineer");

请注意，从设计方面来看，所有字段都应为private，ID 也应为final，因为一旦创建员工，ID 就不会更改。如果此人更改姓名（婚姻、证人保护等），name 字段可能会更改，而其他字段可能会不时更改。