为什么我不能从另一个类访问Object的属性？（即使当Object被传递给试图访问属性的类时）

Question

我希望你能帮助我。

我的问题是：

当传递数组列表中的对象的实例时，我将该数组列表传递给另一个类，如何访问它的属性？

我可以在将其传递给另一个类之前访问属性。

“主要”类将数据传递给“员工”类。

Employees employees = new Employees();
employees.addEmployee("Orlando", "Silva", 111111111, "St. King's Street", 111111111, 11111111111111L, employees.getMinimumWage(), employees.getDayShift());
employees.addEmployee("Rui", "Guilherme", 111111111, "St. King's Street", 111111111, 11111111111111L, employees.getMinimumWage(), employees.getNightShift());
employees.addEmployee("Marco", "Alberto", 111111111, "St. King's Street", 111111111, 11111111111111L, employees.getMinimumWage(), employees.getNightShift());

“Employees”类接收数据，将其添加到一个数组中，然后从该数组转到“AllStaff”类

请注意，我可以在方法“addToAll人员（）”中访问属性

public class Employees {
    // Atributes
    public String name;
    private String lName;
    private int nID;
    private String address;
    private int phNum;
    private long nSocialSecNum;
    private double minimumWage = 740.83;
    private double employeeWage;
    private String dayShift = "Day shift", afternoonShift = "Afternoon shift", nightShift = "Night shift";
    private String shift;

    private ArrayList<Employees> employeesArrayList = new ArrayList<Employees>();
    private AllStaff allStaff = new AllStaff();
    //---------------------
    // Constructors
    public Employees(){

    }

    public Employees(String name, String lName, int nID, String address, int phNum, long nSocialSecNum, double minimumWage, String shift){
        this.name = name;
        this.lName = lName;
        this.nID = nID;
        this.address = address;
        this.phNum = phNum;
        this.nSocialSecNum = nSocialSecNum;
        this.employeeWage = minimumWage;
        this.shift = shift;
        //----------------
        extraWage();
    }

    //---------------------

    public void addEmployee(String name, String lName, int nID, String address, int phNum, long nSocialSecNum, double minimumWage, String shift){
           Employees employee = new Employees(name, lName, nID, address, phNum, nSocialSecNum, minimumWage, shift);
           employeesArrayList.add(employee);
           addToAllStaff();
    }

    void addToAllStaff(){
        System.out.println("(Class Employees) employees size: " + employeesArrayList.size());

        for (int i = 0; i < employeesArrayList.size(); i++){
            System.out.println("Employee names: " + employeesArrayList.get(i).getName());
            System.out.println("Employee names: " + employeesArrayList.get(i).name);
        }

        allStaff.addEmployees(employeesArrayList);
    }
}

在类"所有的工作人员"，是我没有访问的属性

public class AllStaff {
    static ArrayList <AllStaff> employeesArrayList;

    public AllStaff(){

    }

    public void addEmployees(ArrayList listOfEmployees){
        System.out.println("List of employees size: " + listOfEmployees.size());

        for (int i = 0; i < listOfEmployees.size(); i++){
            System.out.println("Employee names: " + listOfEmployees.get(i).getName());
            System.out.println("Employee names: " + listOfEmployees.get(i).name);
        }

        this.employeesArrayList = listOfEmployees;
    }

完整代码请访问此链接:https://github . com/OrlandoVSilva/test-to-github/tree/master/test-to-github/src/Mercado

我希望这个问题有你需要的一切。谢谢

Answer 1

您错过了 AllStuffs addEmployees（） 方法参数中的泛型类型。这就是问题所在。它应该是这样的：

public void addEmployees(ArrayList<Employees> listOfEmployees){