Question

/**
 * Computes and returns the Date on which Thanksgiving will fall 
 * in a given year.
 *
 * NOTE: By law, Thanksgiving is the 4th Thursday in November
 *
 * @param year the year for which to compute the date of Thanksgiving
 * @return the Date of Thanksgiving for the specified year
 */

     public Date getThanksgiving(int year)
     {    

        int weekcount = 0 ; // record the amount of weeks that has passed  

        Date thanksgiving = new Date (11 , 1 , year) ;

        while ( weekcount < 4 )
           {
              thanksgiving.next(); // add one to date 

          if (thanksgiving.getDayOfWeek().equals("Thursday"))// check if the day of week is Thursday 
           {
               weekcount++ ;    // add one to weekcount 
           }           

           if (weekcount == 4)
           {

           System.out.println(thanksgiving.getLongDate());

           } 


           }  



           return thanksgiving ;
     }

我不应该使用println语句而应该使用return语句返回正确的日期。问题是我得到了这个＆＃34; Date @ 2f4d3709＆＃34;作为我的输出。日期类 - http://users.cis.fiu.edu/~shawg/2210/Date.html

Answer 1

如果您尝试拨打PrintStream.println() with an Object argument，该对象将使用Object.toString()转换为String。由于您的Date课程未覆盖toString()，因此将使用java.lang.Object提供的默认实施。

你可以解决这三种方式。

您需要调用Date.getLongDate()方法并将返回的值传递给输出，而不是整个对象。
将getThanksgiving(int)的返回值更改为字符串并返回Date.getLongDate()
覆盖toString()课程中的Date，如下所示。

示例：

@Override
public String toString(){
  return getLongDate();
}

Answer 2

您的方法返回Date个对象，由于您的类中未实现toString()，因此打印对象的格式将为＆＃34; Date @ 2f4d3709＆＃34;在做某事时

System.out.println(getThanksgiving(2014));

相反，您必须调用getLongDate()来获取要格式化的字符串

System.out.println(getThanksgiving(2014).getLongDate());

返回语句不以正确的格式返回输出

2 个答案: