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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>> outer=new ArrayList<>();
  13.     	// fill outer
  14.     	List<Integer> tmpList = new ArrayList<>();
  15.     	tmpList.add(1);
  16.     	outer.add(tmpList);
  17.     	tmpList = new ArrayList<>();
  18.     	tmpList.add(1); tmpList.add(2);
  19.     	outer.add(tmpList);
  20.     	tmpList = new ArrayList<>();
  21.     	tmpList.add(1); tmpList.add(2); tmpList.add(3);
  22.     	outer.add(tmpList);
  23.     	System.out.println(outer);
  24.  
  25.  
  26.     	int maxColSize = outer.stream().mapToInt(List::size).max().orElse(0);
  27.     	for (int y=0; y<maxColSize; y++) {
  28.     		for (int x=0; x<outer.size(); x++) {
  29.     			List<Integer> currentInner = outer.get(x);
  30.     			if (currentInner.size() > y) {
  31.     				System.out.println(currentInner.get(y));
  32.     			}
  33.     		}
  34.     	}
  35. 	}
  36. }
Success #stdin #stdout 0.19s 320832KB
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[[1], [1, 2], [1, 2, 3]]
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https://ideone.com/mKBj8x
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
public

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