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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. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. 	public static void main (String[] args) throws java.lang.Exception
  11. 	{
  12.         List < List < Integer > > listOfLists =
  13.                 List.of(
  14.                         List.of( 1 , 2 , 3 ) ,
  15.                         List.of( 4 , 5 ) ,
  16.                         List.of( 6 , 7 , 8 )
  17.                 );
  18.         OptionalInt longestLength = listOfLists.stream().mapToInt( List :: size ).max();
  19.         int limit = longestLength.orElse( 0 );
  20.  
  21.         int initialCapacity = listOfLists.stream().mapToInt( List :: size ).sum();
  22.         List < Integer > results = new ArrayList <>( initialCapacity );
  23.         for ( int i = 0 ; i < limit ; i++ )
  24.         {
  25.             for ( List < Integer > listOfIntegers : listOfLists )
  26.             {
  27.                 try
  28.                 {
  29.                     Integer integer = listOfIntegers.get( i );
  30.                     results.add( integer );
  31.                 }
  32.                 catch ( IndexOutOfBoundsException e )
  33.                 {
  34.                     // Do nothing. Swallow exception. We expect to fall out of bounds on shorter lists.
  35.                 }
  36.             }
  37.         }
  38.  
  39.         System.out.println( "listOfLists = " + listOfLists );
  40.         System.out.println( "longestLength = " + longestLength );
  41.         System.out.println( "limit = " + limit );
  42.         System.out.println( "results = " + results );
  43. 	}
  44. }
Success #stdin #stdout 0.14s 51244KB
comments (?)
stdin 
Standard input is empty
stdout 
listOfLists = [[1, 2, 3], [4, 5], [6, 7, 8]]
longestLength = OptionalInt[3]
limit = 3
results = [1, 4, 6, 2, 5, 7, 3, 8]
https://ideone.com/XBbwd6
language:
Java (HotSpot 12)
created:
4 years ago
visibility:
public

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