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How to check if array contains three consecutive dates in java?
To check to find whether a given array contains three consecutive dates:
- Convert the given array into a list of type LocalDate.
- Using the methods of the LocalDate class compare ith, i+1th and i+1th, i+2th elements of the list if equal the list contain 3 consecutive elements.
Example
import java.time.LocalDate;
import java.time.Month;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Date;
import java.util.List;
public class ConsicutiveDate {
public static void main(String args[]) {
String[] dates = {"5/12/2017", "6/12/2017", "7/12/2017"};
List<LocalDate> localDateList = new ArrayList<>();
for (int i = 0; i<dates.length; i++) {
String[] data = dates[i].split("/");
Month m = Month.of(Integer.parseInt(data[1]));
LocalDate localDate =
LocalDate.of(Integer.parseInt(data[2]),m,Integer.parseInt(data[0]));
localDateList.add(localDate);
Date date = java.sql.Date.valueOf(localDate);
}
System.out.println("Contents of the list are ::"+localDateList);
Collections.sort(localDateList);
for (int i = 0; i < localDateList.size() - 1; i++) {
LocalDate date1 = localDateList.get(i);
LocalDate date2 = localDateList.get(i + 1);
if (date1.plusDays(1).equals(date2)) {
System.out.println("Consecutive Dates are: " + date1 + " and " + date2);
}
}
}
}Output
Contents of the list are ::[2017-12-05, 2017-12-06, 2017-12-07] Consecutive Dates are: 2017-12-05 and 2017-12-06 Consecutive Dates are: 2017-12-06 and 2017-12-07
Updated on: 19-Feb-2020
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