我有以下内容：
ArrayList<GregorianCalendar> toRemove = new ArrayList<GregorianCalendar>();
SortedSet<GregorianCalendar> copyKeys = new TreeSet<GregorianCalendar>(MyCalendarTester.myCal.getMyCalHash().keySet());
for(GregorianCalendar remove: toRemove){
copyKeys.removeAll(Collections.singleton(remove));
}
我正在尝试删除每次出现的密钥＆＃34;删除＆＃34;在我的TreeSet copyKeys中。但它似乎只是删除其中一个。有人可以告诉我我做错了什么吗？如果您需要更多信息，请与我们联系。
编辑： 为了它，这是我整个方法的混乱（我知道它还有一些问题只是我要问的问题），但是现在是这样的：
public void eventList(){
int year = -1;
GregorianCalendar tempKey = null;
ArrayList<Event> tempArr = new ArrayList<Event>();
ArrayList<GregorianCalendar> toRemove = new ArrayList<GregorianCalendar>();
int countEnd = 0;
if(MyCalendarTester.myCal.getMyCalHash().equals(null)){
System.out.println("Your calendar is empty!");
}
else{
System.out.println("Here are your events: ");
SortedSet<GregorianCalendar> keys = new TreeSet<GregorianCalendar>(MyCalendarTester.myCal.getMyCalHash().keySet());
SortedSet<GregorianCalendar> copyKeys = new TreeSet<GregorianCalendar>(MyCalendarTester.myCal.getMyCalHash().keySet());
tempKey = keys.first();
int countTotal = keys.size();
for(GregorianCalendar key : copyKeys){
GregorianCalendar copyKey = key;
Event value = MyCalendarTester.myCal.getMyCalHash().get(key);
// System.out.println(" key.get(Calendar.MONTH) = " + key.get(Calendar.MONTH));
// System.out.println("(tempKey.get(Calendar.MONTH)) = " + (tempKey.get(Calendar.MONTH)));
// System.out.println(" key.get(Calendar.DATE) = " + key.get(Calendar.DATE));
// System.out.println(" tempKey.get(Calendar.DATE) = " + (tempKey.get(Calendar.DATE)));
tempArr.add(value);
countEnd++;
if(key.get(Calendar.MONTH) == (tempKey.get(Calendar.MONTH))
&& key.get(Calendar.DATE) == (tempKey.get(Calendar.DATE))
&& key.get(Calendar.YEAR) == tempKey.get(Calendar.YEAR)){
// tempArr.add(value);
if(key.get(Calendar.YEAR) != year){
System.out.println(key.get(Calendar.YEAR));
year = key.get(Calendar.YEAR);
System.out.println(MyCalendarTester.arrayOfDays[key.get(Calendar.DAY_OF_WEEK) - 1] + ", " + MyCalendarTester.arrayOfMonths[key.get(Calendar.MONTH) - 1] + " "
+ key.get(Calendar.DATE) + " ");
}
toRemove.add(copyKey);
// toRemove.add(copyKey);
//keys.remove(copyKey);
}else{
//if(count <= 1){
//if(tempArr.size() == 1){
if(countEnd == countTotal){
tempArr.remove(tempArr.size() - 1);
}else{
if(tempArr.size() > 1){
tempArr.remove(tempArr.size() - 2);
}else{
tempArr.remove(tempArr.size() - 1);
}
if(toRemove.size() > 0){
toRemove.remove(toRemove.size() - 1);
}
}
// }
// else{
// tempArr.remove(tempArr.size() - 2);
// toRemove.remove(toRemove.size() - 1);
// }
//
// count = 0; //reset matches
//}
}
tempKey = key;
}
Collections.sort(tempArr);
for(Event e: tempArr){
if(e.endTime != null){
System.out.println(" " + e.eventName + " " + e.startTime.get(Calendar.HOUR_OF_DAY) + ":" +
e.startTime.get(Calendar.MINUTE) + " " + e.endTime.get(Calendar.HOUR_OF_DAY)
+ ":" + e.endTime.get(Calendar.MINUTE));
//tempKey = key;
// year = key.get(Calendar.YEAR);
//keys.remove(key);
}
else{
System.out.println(" " + e.eventName + " " + e.startTime.get(Calendar.HOUR_OF_DAY) + ":" +
e.startTime.get(Calendar.MINUTE));
// tempKey = key;
// year = key.get(Calendar.YEAR);
//keys.remove(key);
}
}
tempArr.clear();
//break;
for(GregorianCalendar remove: toRemove){
copyKeys.removeAll(Collections.singleton(remove));
}
for(GregorianCalendar key : copyKeys){
Event value = MyCalendarTester.myCal.getMyCalHash().get(key);
if(tempArr.size() == 0){
if(value.endTime != null){
if(key.get(Calendar.YEAR) == year){
System.out.println(MyCalendarTester.arrayOfDays[key.get(Calendar.DAY_OF_WEEK) - 1] + ", " + MyCalendarTester.arrayOfMonths[key.get(Calendar.MONTH) - 1] + " "
+ key.get(Calendar.DATE) + " " + value.startTime.get(Calendar.HOUR_OF_DAY) + ":" + value.startTime.get(Calendar.MINUTE) + " - " + value.endTime.get(Calendar.HOUR_OF_DAY)
+ ":" + value.endTime.get(Calendar.MINUTE) + " " + value.eventName);
// tempKey = key;
}else{
System.out.println(key.get(Calendar.YEAR));
System.out.println(MyCalendarTester.arrayOfDays[key.get(Calendar.DAY_OF_WEEK) - 1] + ", " + MyCalendarTester.arrayOfMonths[key.get(Calendar.MONTH) - 1] + " "
+ key.get(Calendar.DATE) + " " + value.startTime.get(Calendar.HOUR_OF_DAY) + ":" + value.startTime.get(Calendar.MINUTE) + " - " + value.endTime.get(Calendar.HOUR_OF_DAY)
+ ":" + value.endTime.get(Calendar.MINUTE) + " " + value.eventName );
year = key.get(Calendar.YEAR);
tempKey = key;
}
}else{
if(key.get(Calendar.YEAR) == year){
System.out.println(MyCalendarTester.arrayOfDays[key.get(Calendar.DAY_OF_WEEK) - 1] + ", " + MyCalendarTester.arrayOfMonths[key.get(Calendar.MONTH) - 1] + " "
+ key.get(Calendar.DATE) + " " + value.startTime.get(Calendar.HOUR_OF_DAY) + ":" + value.startTime.get(Calendar.MINUTE) + " " + value.eventName);
tempKey = key;
}else{
System.out.println(key.get(Calendar.YEAR));
System.out.println(MyCalendarTester.arrayOfDays[key.get(Calendar.DAY_OF_WEEK) - 1] + ", " + MyCalendarTester.arrayOfMonths[key.get(Calendar.MONTH) - 1] + " "
+ key.get(Calendar.DATE) + " " + value.startTime.get(Calendar.HOUR_OF_DAY) + ":" + value.startTime.get(Calendar.MINUTE) + " " + value.eventName);
System.out.println();
year = key.get(Calendar.YEAR);
tempKey = key;
}
}
}
}
}
}
我最初按键（日期）按升序排序。从那里，我正在寻找任何相同的日期，并按时间（值）排序。然后，由于我已经按时分类和打印了那些日子，我不想再转发它们。我已经调整了几个小时以试图让它合作，所以也许我现在在思考它。无论如何，如果有人能够看到这个并提出一些建议，我会非常感激。否则，只需跳过，因为这是一个漫长而复杂的问题。
答案 0 :(得分：0)
Set中任何给定对象只会出现一次，这就是为什么只有一个被删除的原因。
设置不允许重复。如果要允许重复项，请使用其他数据结构，例如ArrayList。