1 public static void printWeeks() { 2         SimpleDateFormat format = new SimpleDateFormat("yyyy.MM.dd"); 3         Calendar calendar = Calendar.getInstance(); 4         calendar.set(Calendar.DATE, 1); 5         int month = calendar.get(Calendar.MONTH); 6         int count = 0; 7         while (calendar.get(Calendar.MONTH) == month) { 8             if (calendar.get(Calendar.DAY_OF_WEEK) == Calendar.SUNDAY) { 9                 StringBuilder builder = new StringBuilder();10                 builder.append("week:");11                 builder.append(++count);12                 builder.append(" (");13                 builder.append(format.format(calendar.getTime()));14                 builder.append(" - ");15                 calendar.add(Calendar.DATE, 6);16                 builder.append(format.format(calendar.getTime()));17                 builder.append(")");18                 System.out.println(builder.toString());19             }20             calendar.add(Calendar.DATE, 1);21         }22     }

 打印结果：

月：

1 Calendar calendar = Calendar.getInstance(); 2         int year = calendar.get(Calendar.YEAR); 3         calendar.clear(); 4         //当年元月 5         calendar.set(Calendar.YEAR, year); 6         calendar.set(Calendar.MONTH, 0); 7          8         while (calendar.get(Calendar.YEAR) == year) { 9             String outPrint = "";10             outPrint += year+"年";11             int month = calendar.get(Calendar.MONTH);12               //月起始时间13               calendar.set(GregorianCalendar.DAY_OF_MONTH, 1);   14               String monthStart = format.format(calendar.getTime());15               outPrint += monthStart;16               outPrint += " - ";17             //月终止时间18             calendar.set( Calendar.DATE, 1 );  19             calendar.roll(Calendar.DATE, - 1 );20             String monthEnd = format.format(calendar.getTime());21               outPrint += monthEnd;22             System.out.println(outPrint);23             calendar.add(Calendar.MONTH, 1);24         }

打印结果