Question

I think probably this question has been asked/answered several times before my post. But I couldn’t get the exact thing I am looking for, so I post it again:

I am trying to do like this:

float[][] fa2 = {{7,2}, {5,4}, {9,6}, {4,7}, {8,1}, {2,3}};
ArrayList<Float[]> AF = new ArrayList<Float[]>();
AF = Arrays.asList(fa2);

But it is giving an error:

Type mismatch: cannot convert from List<float[]> to ArrayList<Float[]>

I understand the reason for the error but what is the most convenient way to do the conversion in Java ?

This is the easiest way that I can think of. Is there something better / more convenient ?

float[][] fa2 = {{7,2}, {5,4}, {9,6}, {4,7}, {8,1}, {2,3}};
ArrayList<Float[]> AF = new ArrayList<Float[]>(fa2.length);
for (float[] fa : fa2) {
    //initialize Float[]
    Float[] Fa = new Float[fa.length];
    //copy element of float[] to Float[]
    int i = 0;
    for (float f : fa) {
        Fa[i++] = Float.valueOf(f);
    }
    //add Float[] element to ArrayList<Float[]>
    AF.add(Fa);
}

Answer 1

As you’re converting from float[] to Float[] you have to do it manually:

float[][] fa2 = {{7,2}, {5,4}, {9,6}, {4,7}, {8,1}, {2,3}};
ArrayList<Float[]> AF = new ArrayList<Float[]>();
for(float[] fa: fa2) {
    Float[] temp = new Float[fa.length];
    for (int i = 0; i < temp.length; i++) {
        temp[i] = fa[i];
    }
    AF.add(temp);
}

Or you could just be using float[] all the way:

List<float[]> AF = Arrays.asList(fa2);