Alternative classes of Objective-C in Java?

See more:

Java

Android

Objective-C

iOS

I am building an android app that already build in iOS. I am novice to Objective-C.
I want to find the alternative classes in java, so that I can implement the logic in java that is built in Objective-C.

Here is my java code.

String oldestDateString = "2015-10-01 00:00:00";
String latestDateString = "2015-12-25 00:00:00";

DateTimeFormatter fmt = DateTimeFormat.forPattern("yyyy-MM-dd HH:mm:ss");
DateTime oldestDate = fmt.parseDateTime(oldestDateString);
DateTime latestDate = fmt.parseDateTime(latestDateString);

System.out.println(oldestDate);

while (oldestDate.equals(latestDate)) {

int year = oldestDate.getYear();
int month = oldestDate.getMonthOfYear();
int day = oldestDate.getDayOfMonth();
int daysInMonth;

 daysInMonth = oldestDate.dayOfMonth().getMaximumValue();
 daysInMonth -= 1;

 }

Here is my Objective-C Code.

NSString *latestDateStr = firstOjbect.publishdate;
NSString *oldestDateStr =  lastObject.publishdate;
    
NSDateFormatter *formatter = [[NSDateFormatter alloc]init];
        
[formatter setLocale:[[NSLocale alloc] initWithLocaleIdentifier:@"en_US_POSIX"]];
        
[formatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
NSDate *latestDate = [formatter dateFromString:latestDateStr];
//NSDate *oldestDate = [formatter dateFromString:oldestDateStr];
    
NSString *date = [[oldestDateStr componentsSeparatedByString:[NSString stringWithFormat:@" "]] objectAtIndex:0];
date = [date stringByAppendingFormat:@" 00:00:00"];
    
    
NSDate *cpDate = [formatter dateFromString:date];
    
NSMutableArray *temp = [[NSMutableArray alloc]initWithArray:self.feedsArray];
[self.feedsArray removeAllObjects];
while (NSOrderedAscending == [cpDate compare:latestDate]){

NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *components = [calendar components:(NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit) fromDate:cpDate];

NSCalendar* cal = [NSCalendar currentCalendar];
NSRange range = [cal rangeOfUnit:NSDayCalendarUnit
                                  inUnit:NSMonthCalendarUnit
                                 forDate:cpDate];

int days = [components day];
days -= 1;
NSDate *upDate = [NSDate dateWithTimeInterval:3600*24*(range.length-days) sinceDate:cpDate];
[formatter setTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"GMT"]];
date = [formatter stringFromDate:cpDate];
NSString *upDateStr = [formatter stringFromDate:upDate];
NSLog(@"date %@ with %@",date, upDateStr);
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"(%K >= %@) AND (%K < %@)",@"publishdate",date,@"publishdate",upDateStr];
NSArray *todayPosts = [temp filteredArrayUsingPredicate:predicate];
todayPosts = [[todayPosts reverseObjectEnumerator]allObjects];
if(todayPosts.count >0)
[self.feedsArray insertObject:todayPosts atIndex:0];
todayPosts = nil;
cpDate = upDate;
}
[formatter release];
}
}