如何在java中创建元素数组？

Question

I have a code like this:

Element name = doc.createElement("firstname");
name.appendChild(doc.createTextNode(lastname));
extension.appendChild(name);

Now, if I want to make multiple Element names, how do I do then? I tried to simply make "name" into an array but it didnt work:

Element name[] = null;
name[0] = doc.createElement("firstname");
name[0].appendChild(doc.createTextNode(lastname));
extension.appendChild(name[0]);

any suggestions?

Answer 1

Element name[] = new Element[10]; //or any size

name[] is a reference to an object (Element[] is an object as well). If you set the reference to null you can't dereference it with name[0]= .

Keep in mind that arrays are fixed-size. You might want to look into ArrayList or Vector if you'd like a variable-size datastructure.

Answer 2

try this

Element name[] = new Element[expected_element_number];
name[0] = doc.createElement("firstname");
...