爲什麼這個JUnit測試用例失敗？

-1

一切似乎都很完美，但測試用例仍然失敗，給我一個所有這些的Java.lang.nullPointerException。爲什麼這個JUnit測試用例失敗？

下面是測試案例

@Test 
    public void validMonths() { 
     DayOfWeek dow = new DayOfWeek(1, 1, 1900); 
     assertTrue(dow.getMonthString().compareTo("January") == 0); 
     dow = new DayOfWeek(2, 1, 1900); 
     assertTrue(dow.getMonthString().compareTo("February") == 0); 
     dow = new DayOfWeek(3, 1, 1900); 
     assertTrue(dow.getMonthString().compareTo("March") == 0); 
     dow = new DayOfWeek(4, 1, 1900); 
     assertTrue(dow.getMonthString().compareTo("April") == 0); 
     dow = new DayOfWeek(5, 1, 1900); 
     assertTrue(dow.getMonthString().compareTo("May") == 0); 
     dow = new DayOfWeek(6, 1, 1900); 
     assertTrue(dow.getMonthString().compareTo("June") == 0); 
     dow = new DayOfWeek(7, 1, 1900); 
     assertTrue(dow.getMonthString().compareTo("July") == 0); 
     dow = new DayOfWeek(8, 1, 1900); 
     assertTrue(dow.getMonthString().compareTo("August") == 0); 
     dow = new DayOfWeek(9, 1, 1900); 
     assertTrue(dow.getMonthString().compareTo("September") == 0); 
     dow = new DayOfWeek(10, 1, 1900); 
     assertTrue(dow.getMonthString().compareTo("October") == 0); 
     dow = new DayOfWeek(11, 1, 1900); 
     assertTrue(dow.getMonthString().compareTo("November") == 0); 
     dow = new DayOfWeek(12, 1, 1900); 
     assertTrue(dow.getMonthString().compareTo("December") == 0); 
    }

這裏是我的方法

public String getMonthString(){ 
     String[] arrayOfMonths = new String[11]; 
     arrayOfMonths[0] = "January"; 
     arrayOfMonths[1] = "February"; 
     arrayOfMonths[2] = "March"; 
     arrayOfMonths[3] = "April"; 
     arrayOfMonths[4] = "May"; 
     arrayOfMonths[5] = "June"; 
     arrayOfMonths[6] = "July"; 
     arrayOfMonths[7] = "August"; 
     arrayOfMonths[8] = "September"; 
     arrayOfMonths[9] = "October"; 
     arrayOfMonths[10] = "November"; 
     arrayOfMonths[11] = "December"; 
     if (this.myMonth > 0 && this.myMonth <=12){ 
      return arrayOfMonths[this.myMonth-1]; 
     } 
     else{ 
      return "NO_VALUE"; 
     } 
    }

沒有人知道是怎麼回事？

來源

2013-09-16 Bob Marley

如果您發佈堆棧跟蹤並指出哪條線路正在拋出異常，這將會很有幫助。 –

這行是失敗跟蹤，assertTrue（dow.getMonthString（）。compareTo（「January」）== 0）; –

dow爲null，dow.getMonthString（）爲null或compareTo（）拋出NPE。打印出dow和get.getMonthString（）。 –

arrayOfMonths需要是大小爲12，而不是11

編輯：誰upvoted我不應該有。 :-)這會拋出和ArrayIndexOutOfBoundsException，而不是NPE。這仍然是一個真正的問題，而不是他所擁有的。

來源

2013-09-16 18:11:01

我改變後仍然失敗 –

爲什麼這個JUnit測試用例失敗？

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