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  1. import java.util.*;
  2.  
  3. class Ideone {
  4. 	public static void main (String[] args)	{
  5. 		List<List<Integer>> matrix = Arrays.asList(Arrays.asList(1, 2), Arrays.asList(3, 4));
  6. 		matrix = Collections.unmodifiableList(matrix);
  7. 		matrix.get(1).set(1, 666);
  8. 		for (List<Integer> row : matrix) {
  9. 			for (Integer value : row)
  10. 				System.out.print(value + " ");
  11. 			System.out.println();
  12. 		}
  13. 	}
  14. }
Success #stdin #stdout 0.04s 4386816KB
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stdin
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Standard input is empty
stdout
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1 2 
3 666
https://ideone.com/kBiuSa
language:
Java (HotSpot 12)
created:
6 years ago
visibility:
public

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