Question

我试图将用户周日 - 周六输入的所有小时数传递给3个构造函数中的任何一个。我无法使用我拥有的代码。我做错了什么，我该如何解决？ **固定**

public static TimeCard processTimeCard(String data)
{
   String[] split = data.split(",");
   String employee = split[0];
   String project = split[1];
   double rate = Double.parseDouble(split[2]);

   double hours = 0.0;

   String[] days = { "Sunday", "Monday", "Tuesday",
                      "Wednesday", "Thursday",
                      "Friday", "Saturday"};

   Scanner keyboard = new Scanner(System.in);

   // Get number of hours for each day of the week
   for (int index = 0; index < days.length; index++)
   {
       System.out.println("How many hours on " + days[index] + ".");
       hours += Double.parseDouble(keyboard.nextLine());
   }

   TimeCard arrow = new TimeCard(employee, project, rate, hours);

   return arrow;

   }

}

class TimeCard
{
// Instance Variables
private String employeeName;
private String project;
private double rate;
private double hours;

//Class Variables
private static int numCards = 0;
private static final double OT_MULTIPLIER = 1.5;
private static final int OT_LIMIT = 40;


/**
* Constructor 1
*/
public TimeCard(String employee, String project, double rate, double hours)
{
    this.employeeName = employee;
    this.project = project;
    this.rate = rate;
    this.hours = hours;
    numCards++;
}

/**
 * Constructor 2
*/
public TimeCard(String employee, String project)
{
    rate = 0;
    hours = 0.0;
    numCards++;
}

/**
 * Constructor 3
*/
public TimeCard(String employee)
{
    project = "none";
    rate = 0;
    hours = 0.0;
    numCards++;
}

   /**
 * Accessors
*/
    public String getHours()
{
    return this.hours;
}

我得到的错误是

   error: incompatible types
   return this.hours;

   required: String
   found; double

如何修复此错误

Answer 1

它无法正常工作，因为它与您的任何构造函数都不匹配。将new TimeCard(employee, project, rate, hours)与各种构造函数进行比较，您会看到参数不匹配。

更新构造函数＃1（或创建一个新构造函数），如下所示：

public TimeCard(String employee, String project, double rate, double hours)
{
    this.employeeName = employee;
    this.project = project;
    this.rate = rate;
    this.hours = hours;
    numCards++;
}

Answer 2

我试图将用户周日 - 周六输入的所有小时数传递给3个构造函数中的任何一个

我在你的代码中没有看到它。

我猜你需要通过总小时数。有了这个，你就不会这样做了：

hours = Double.parseDouble(keyboard.nextLine());

你读过它但不做任何事情。您可以尝试添加所有这些小时：

hours += Double.parseDouble(keyboard.nextLine());

阅读完所有小时后，您可以将其传递给构造函数，如下所示：

TimeCard arrow = new TimeCard(employee, project, rate, hours);

但请确保您的主构造函数接受hours作为参数：

/**
* Constructor 1
*/
public TimeCard(String employee, String project, double rate, double hours)
{
    this.employeeName = employee;
    this.project = project;
    this.rate = rate;
    this.hours = hours;
    numCards++;
}

将值传递给构造函数

2 个答案: