Processing shuffle an array in array

Question

I want to shuffle my array which is in an array, but only the first array

String[][] kaarten = {  {"G", "T","1"}, 
                        {"G", "T","2"},
                        {"G", "T","3"},
                        //green triangle
                        {"R", "T","1"},
                        {"R", "T","2"},
                        {"R", "T","3"},
                        //red triangle
                        {"B", "T","1"},
                        {"B", "T","2"},
                        {"B", "T","3"},
                        //blue triangle
                        {"G", "O","1"},
                        {"G", "O","2"},
                        {"G", "O","3"},
                        //green Oval
                        {"R", "T","1"},
                        {"R", "T","2"},
                        {"R", "T","3"},
                        //Red Oval
                        {"B", "T","1"},
                        {"B", "T","2"},
                        {"B", "T","3"},
                        //Blue Oval
                        {"G", "S","1"},
                        {"G", "S","2"},
                        {"G", "S","3"},
                        //green Square
                        {"R", "T","1"},
                        {"R", "T","2"},
                        {"R", "T","3"},
                        //Red Square
                        {"B", "T","1"},
                        {"B", "T","2"},
                        {"B", "T","3"},
                        //Blue Square
                      };

So the {"G", "T", "1"} needs to stay the same.

I hope you understand what I am seeing, it's kinda hard to explain.

Oh and please also edit your question to add the appropriate language tag. — Some programmer dude
– Some programmer dude, Commented Jan 23, 2019 at 12:38
I want the array to be shuffled without the array which in it is being shuffled @Raúl — king-off-none-coding
– king-off-none-coding, Commented Jan 23, 2019 at 13:43

Karol Dowbecki · Accepted Answer · 2019-01-23 12:47:47Z

3

The easiest way would be to create a list of String[] and use Collections.shuffle():

List<String[]> values = new ArrayList<>();
Collections.addAll(values, kaarten);
Collections.shuffle(values);
values.stream().map(Arrays::toString).forEach(System.out::println);

will show that values was randomly rearranged without modifying the internal String[]:

[G, O, 3] 
[R, T, 3]
[G, O, 2]
[R, T, 3]
[R, T, 1]
...

answered Jan 23, 2019 at 12:47

Karol Dowbecki

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