Calendar.before（）返回錯誤的值

Question

以下代碼的主要想法是比較兩個日期，精度爲1分鐘。

rc是參考時間和tc是一次考驗：

// Checking precision of 1 minute 
Calendar upperBound, lowerBound; 
DateFormat dateFormat = new SimpleDateFormat("dd/MM/yyyy hh:mm"); 

upperBound = (Calendar)rc.clone(); 
upperBound.add(Calendar.MINUTE, 1); 
lowerBound = (Calendar)rc.clone(); 
lowerBound.add(Calendar.MINUTE, -1); 

//Actual values 
System.out.println("test "+dateFormat.format(tc.getTime())); 
System.out.println("UpperB"+dateFormat.format(upperBound.getTime())); 
System.out.println("LowerB "+dateFormat.format(lowerBound.getTime())); 
//Tests 
System.out.println("test after "+tc.after(lowerBound)); 
System.out.println("test before "+tc.before(upperBound)); 

和輸出如下：

test 05/10/2015 09:43. 

UpperB 05/10/2015 09:44. 

LowerB 05/10/2015 09:42. 

test after false. 

test before true. 

我很困惑，因爲在Calendar.after()比較測試日期的下限返回false，它應該是true之前打印的日期。

任何想法，也許我做錯了什麼？

Answer 1

測試使用JDK 1.8：

 Calendar tc = Calendar.getInstance(); 
     Calendar rc = Calendar.getInstance(); 

     Calendar upperBound, lowerBound; 
     DateFormat dateFormat = new SimpleDateFormat("dd/MM/yyyy hh:mm"); 

     upperBound = (Calendar) rc.clone(); 
     upperBound.add(Calendar.MINUTE, 1); 
     lowerBound = (Calendar) rc.clone(); 
     lowerBound.add(Calendar.MINUTE, -1); 

     //Actual values 
     System.out.println("test " + dateFormat.format(tc.getTime())); 
     System.out.println("UpperB " + dateFormat.format(upperBound.getTime())); 
     System.out.println("LowerB " + dateFormat.format(lowerBound.getTime())); 
     //Tests 
     System.out.println("test after " + tc.after(lowerBound)); 
     System.out.println("test before " + tc.before(upperBound)); 

輸出：

test 08/11/2015 05:34 
UpperB 08/11/2015 05:35 
LowerB 08/11/2015 05:33 
test after true 
test before true