Question

我正在学习Java中的OOP。完成编码并对其进行编译时，编译器会显示此Manager类对Photographer类具有私有访问权限。我已经工作了一整晚，但我仍然找不到问题。任何人都可以告诉我如何解决它？

public class Manager
{

    private ArrayList<Assignment> toDoList;
    private ArrayList<Photographer> employees;
    public Manager()
    {
    this.toDoList = new ArrayList<Assignment>();
    this.employees = new ArrayList<Photographer>();
    }

    public void hire(String photographer)
    {
        employees.add(new Photographer(photographer));

    }

    public void giveOutAssignments()
    {
        int maxId;  
        if(toDoList.size()!=0 && employees.size()!=0){

            for(Photographer p: employees){
                maxId = 0;

                //get highest priority
                for(int i = 1; i<toDoList.size();i++){
                    //just check the unfinished assigns
                    if(!toDoList.get(i).getStatus()){
                        if(toDoList.get(i).getPriority()>toDoList.get(maxId).getPriority())
                            maxId = i;
                    }
                }
                //take the highest priority
                Assignment currentAssign = toDoList.get(maxId);

                //HERE IS THE PROBLEM
                p.takePicture(currentAssign.getDescription());  

                //set it as finished
                toDoList.get(maxId).setStatus();
            }
        }
    }

}

这是摄影师班：公共课摄影师 { 私人地图照片; 私有字符串名称;

    public Photographer(String name)
    {
    photos = new HashMap(); // An important line. Must go in the constructor.
    readPhotos(); // A very important line. this must go in the Photographer
    // constructor so that the photographer will be able to take Pictures.
    this.name = name;   
    }

    private String takePicture(String description)
    {
    return photos.get(description);
    }

    private void readPhotos()
    {
    Pattern commentPattern = Pattern.compile("^//.*");
    Pattern photoPattern = Pattern.compile("([a-zA-Z0-9\\.]+) (.*)");
    try
    {
        Scanner in = new Scanner(new File("photos.txt"));

        while (in.hasNextLine())
        {
        String line = in.nextLine();

        Matcher commentMatcher = commentPattern.matcher(line);
        Matcher photoMatcher = photoPattern.matcher(line);
        if (commentMatcher.find())
        {
            // This line of the file is a comment. Ignore it.
        }
        else if (photoMatcher.find())
        {
            String fileName = photoMatcher.group(1);
            String description = photoMatcher.group(2);
            photos.put(description, fileName);
        }
        }
    }
    catch (FileNotFoundException e)
    {
        System.out.println(e);
    }
    }
}

Answer 1

takePicture被声明为private，除了Photographer之外的任何其他上下文都无法访问...

private String getDescription() {

将其更改为public ...

public String getDescription() {

请查看Controlling Access to Members of a Class了解详情

PS -

我在takePicture ...

中的返回类型Photographer也遇到了问题

private String takePicture(String description)
{
    return photos.get(description);
}

不得不改为更像......

public String takePicture(String description) {
    return (String)photos.get(description);
}

即使我没有返回任何字段，为什么还会出现“私人访问”错误？

1 个答案: