Set size of inner arrays in Java

Question

I have an ArrayList of Arrays:

ArrayList<byte[]> arrayOfBytes = new ArrayList <>();

I want (and I don't know how) to set a predefined size of the Inner Arrays (the bytes arrays).

Is this possible? If it is, how can I do it?

Thanks in advance!

Answer 1

The one and only way is to set the size when you're adding those arrays into the list.

list.add(new byte[size]);

There are no arrays in the List without you explicitly adding them. Just create the arrays at the right size.

Answer 2

Create a function the returns an array of constant size and use it

private byte[] getArray() {
    return new byte[10]();
}

The init the inner arrays by calling this function

Answer 3

Your list starts empty, so it has no arrays in it. Therefore you need to explicitly add them - and as part of doing so, you'll be dimensioning them:

final int arraySize = 1024;

for (int i = 0; i < 10; i++)
{
  arrayOfBytes.add(new byte[arraySize]);
}

Answer 4

当您声明列表是不可能的（该信息与声明列表本身无关）时，但是您可以在向列表中添加新元素时定义大小

arrayOfBytes.add(new byte[size]);