Sort Arraylist Of Calendars
I have a list of objects containing hours and minutes. The list is in a chaotic order and I need to sort them by the hour from 00:00 to 23:59. The object is public class ProgramIte
Solution 1:
I believe the the theme is not calendar sorting. If so then do not allocate more memory using Calender object, add this method simply,
publicclassProgramItem {
....
intgetAsMins() {
return hours *60 + mins;
}
}
....
Collections.sort(items, new Comparator<ProgramItem>() {
publicintcompare(ProgramItem item1, ProgramItem item2) {
return item1.getAsMins() - item2.getAsMins();
}
});
Solution 2:
Add this rule to the comparator:
Collections.sort(items, new Comparator<ProgramItem>() {
publicintcompare(ProgramItem item1, ProgramItem item2) {
if (item1.getCalendar().get(Calendar.HOUR) == 0 && item1.getCalendar().get(Calendar.MINUTE) == 0) {
return-1
}
if (item1.getCalendar().before(item2.getCalendar())) {
return-1;
} else {
return1;
}
}
})
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