How to check if array contains three consecutive dates in java?

Java 8Object Oriented ProgrammingProgramming

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

Live Demo

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
raja
Published on 09-Jan-2018 13:11:53
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