How to initialize a nested anonymous array double in Java?

Question

I have a constructor that expects a nested array of doubles like this:

public class Thing {

    public Thing (double[][] doubles) {
    }
}

I would like to overload the constructor with a default constructor that takes no arguments like this:

    public Thing () {
        this(/* TODO */);
    }

Bengt · Accepted Answer · 2014-10-19 01:49:28Z

3

You have to nest a new one-dimensional double array into another two dimensional double array. That way, you can initialize the inner, one-dimensional one manually and the outer two dimensional one with it.

    public Thing () {
        this(new double[][]{new double[]{1}});
    }

You can also initialize more than one double:

        this(new double[][]{new double[]{1, 2, 3}});

or even:

        this(new double[][]{new double[]{1, 2, 3},
                            new double[]{4, 5, 6}});

answered Oct 19, 2014 at 1:49

Bengt

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1 Comment

nmore Over a year ago

Or new double[0][0] or size you want in the brackets.

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