Java子类最后一个实例覆盖值

Question

我是一个涉猎Java的网络开发人员(再次),我遇到了麻烦.

基本上,我有一个超类Employee,它有两个子类,扩展名为Management和Programmer.Employee类包含一个employees基本上是Employee对象数组的数组.

以下是两个类(Employee和Management)和最终主要方法的重要摘要.我将在底部解释输出.

public class **Employee** {

   private static String firstName;
   protected static int MAXEMPLOYEES = 5;
   protected Employee[] employees = new Employee[MAXEMPLOYEES];
   protected int totEmployees = 0;

   public Employee(String first) {
       setFirstName(first);
   }

   public void setFirstName(String str){
       firstName = str;
   }

   public String getFirstName(){
       return firstName;
   }

    public boolean addEmployee(String fname) {
       boolean added = false;
       if (totEmployees < MAXEMPLOYEES) {
           Employee empl = new Employee(fname);
           employees[totEmployees] = empl;
           added = true;
           totEmployees++;
       }
       return added;
   }

}

public class **Management** extends **Employee** {
    private String title = "Project Manager";

    public Management(String fname, String t){
        super(fname);
        title = t;
    }

    public boolean addManagement(String fname, String t){
        boolean added = false;

        if (totEmployees < MAXEMPLOYEES) {
            employees[totEmployees] = new Management(fname, t);
            added = true;
            totEmployees++;
        }
        return added;
    }
}

-------------------------------------
package employee;

public class EmployeeApplication {

    public static void main(String[] args) {
        Employee[] empl = new Employee[3];
        empl[0] = new Employee("Kyle");
        empl[1] = new Management("Sheree", "Director");

        System.out.println(empl[0].getFirstName());
    }
}

现在,我希望系统打印出"Kyle",但它打印出"Sheree".有任何想法吗？？？

Answer 1

private static String firstName;

您创建了firstName静态,这意味着所有实例共享相同的名称.您需要删除静态修饰符,以便不同的Employees具有不同的名称.您还需要将私有访问修饰符更改为protected,以便子类继承该字段.