How can I return 2-dimensional array in Java 8?

Question

I have a method that returns a matrix, where row is a pair of User and MessageData.

public static Object[][] getData() {
    DomXmlParsing parse = new DomXmlParsing();
    List<User> users = parse.getUsers();
    List<MessageData> datas = parse.getDataForMessage();
    return new Object[][]{
            {users.get(0), datas.get(0)},
            {users.get(1), datas.get(1)},
            {users.get(2), datas.get(2)},
            {users.get(3), datas.get(3)},
            {users.get(4), datas.get(4)}
    };
}

How can I return this matrix using Stream API of Java 8?

IntStream.rangeClosed(0, 4).map(i -> new Object[]{users.get(i), datas.get(i)}).toArray(Object[][]::new) — Boris the Spider
– Boris the Spider, Commented Feb 10, 2018 at 16:23
Poor question title. You should mention streams in the title. — Robert
– Robert, Commented Feb 10, 2018 at 17:47

Ousmane D. · Accepted Answer · 2018-02-10 16:31:56Z

6

You can accomplish the task at hand with:

return IntStream.range(0, users.size())
                .mapToObj(i -> new Object[]{users.get(i), datas.get(i)})
                .toArray(Object[][]::new);

answered Feb 10, 2018 at 16:31

Ousmane D.

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