Continuous Development Blog

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Do not use the method for in your frequently used methods.
instead of creating new instances use

Calendar.setTime(DATE)

otherwise each instance use lots of memory: 432 Bytes

UPDATED:

DO NOT USE LIKE THIS

while(condition){
Calendar calendar = Calendar.getInstance();
calendar.setTime(someDate)
int month = calendar.get(Calendar.MONTH);
}

USE LIKE THIS

Calendar calendar = Calendar.getInstance();
while(condition){
calendar.setTime(someDate)
int month = calendar.get(Calendar.MONTH);
}