Java – use streams to map to 2D arrays

I'm trying to create a 2D string array using streams:

String[] fruit1DArray;
String[][] fruit2DArray;

Map<String,String> fruitMap = new HashMap<>();
fruitMap.put("apple","red");
fruitMap.put("pear","green");
fruitMap.put("orange","orange");

fruit1DArray = fruitMap.entrySet()
    .stream()
    .map(key -> key.getKey())
    .toArray(size -> new String[size]);

fruit2DArray = fruitMap.entrySet()
    .stream()
    .map(entry-> new String[]{entry.getKey()})
    .toArray(size -> new String[size][1]);

System.out.println(Arrays.deepToString(fruit1DArray));
System.out.println(Arrays.deepToString(fruit2DArray));

The output is:

[orange,apple,pear]
[[orange],[apple],[pear]]

My subsequent output is:

[orange,pear]
[[orange,orange],[apple,red],[pear,green]]

I mean https://stackoverflow.com/a/47397601/887235

Solution

You forgot to get the value from the input map:

fruit2DArray = fruitMap.entrySet()
                       .stream()
                       .map(e -> new String[]{e.getKey(),e.getValue()})
                       .toArray(String[][]::new);

Output:

[[orange,green]]