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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. import java.time.*;
  8. import java.time.temporal.*;
  9. import java.time.format.*;
  10.  
  11. /* Name of the class has to be "Main" only if the class is public. */
  12. class Ideone
  13. {
  14. 	public static void main (String[] args) throws java.lang.Exception
  15. 	{
  16.  
  17.         List<DateRange> ranges = new ArrayList<> ( 3 );
  18.         ranges.add ( new DateRange ( LocalDate.of ( 2017 , Month.JANUARY , 17 ) , LocalDate.of ( 2017 , Month.MARCH , 7 ) ) );
  19.         ranges.add ( new DateRange ( LocalDate.of ( 2017 , Month.FEBRUARY , 12 ) , LocalDate.of ( 2017 , Month.FEBRUARY , 16 ) ) );
  20.         ranges.add ( new DateRange ( LocalDate.of ( 2017 , Month.FEBRUARY , 14 ) , LocalDate.of ( 2017 , Month.MARCH , 25 ) ) );
  21.  
  22.         System.out.println ( "ranges: " + ranges );
  23.  
  24.         // Intersect and combine to create a sequence of new DateRange objects.
  25.         // Collect each start & stop as individual `LocalDate` objects.
  26.         List<LocalDate> dates = new ArrayList<> ( ranges.size () * 2 );
  27.         for ( DateRange range : ranges ) {
  28.             dates.add ( range.start );
  29.             dates.add ( range.stop );
  30.         }
  31.  
  32.         // Sort the collection of dates.
  33.         Collections.sort ( dates );
  34.  
  35.         // Loop the sorted dates, creating DateRange objects as we go.
  36.         List<DateRange> rangesOutput = new ArrayList<> ( dates.size () ); // Not an exact initial capacity but good enough.
  37.         for ( int i = 1 ; i < dates.size () ; i ++ ) {
  38.             LocalDate start = dates.get ( i - 1 ); // Subtract one for silly index counting.
  39.             LocalDate stop = dates.get ( i + 1 - 1 ); // Subtract one for silly index counting. Or use ( i ) instead.
  40.             if (  ! start.equals ( stop ) ) {  // If not equal, proceed. (If equal, ignore and move on to next loop.)
  41.                 DateRange range = new DateRange ( start , stop );
  42.                 rangesOutput.add ( range );
  43.             }
  44.         }
  45.         System.out.println ( "rangesOutput: " + rangesOutput );
  46.  
  47. 	}
  48. }
  49.  
  50. class DateRange {
  51.  
  52.     public LocalDate start, stop;
  53.  
  54.     public DateRange ( LocalDate start , LocalDate stop ) {
  55.         if ( stop.isBefore ( start ) ) {
  56.             throw new IllegalArgumentException ( "The stop date is before the start date." );
  57.         }
  58.         this.start = start;
  59.         this.stop = stop;
  60.     }
  61.  
  62.     @Override
  63.     public String toString () {
  64.         return "DateRange{ " + "start=" + start + ", stop=" + stop + " }";
  65.     }
  66.  
  67. }
  68.  
Success #stdin #stdout 0.04s 4386816KB
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Standard input is empty
stdout
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ranges: [DateRange{ start=2017-01-17, stop=2017-03-07 }, DateRange{ start=2017-02-12, stop=2017-02-16 }, DateRange{ start=2017-02-14, stop=2017-03-25 }]
rangesOutput: [DateRange{ start=2017-01-17, stop=2017-02-12 }, DateRange{ start=2017-02-12, stop=2017-02-14 }, DateRange{ start=2017-02-14, stop=2017-02-16 }, DateRange{ start=2017-02-16, stop=2017-03-07 }, DateRange{ start=2017-03-07, stop=2017-03-25 }]
https://ideone.com/jBqmOB
language:
Java (HotSpot 12)
created:
8 years ago
visibility:
public

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