Suppose I take an integer user input - 17. Now I want to create 17 "Node" class objects. And they'll be named like node1, node2, ..., node17.
How to achieve that?
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Why you want to do this?kaetzacoatl– kaetzacoatl2014-06-22 14:01:52 +00:00Commented Jun 22, 2014 at 14:01
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3Objects don't have names, unless they have a name attribute. Use a loop, create 17 Node instances, each with the desired name, and store them in a List<Node> or a Node[] array.JB Nizet– JB Nizet2014-06-22 14:02:51 +00:00Commented Jun 22, 2014 at 14:02
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1@JBNizet looks like he wants to create objects with reference names as node1, node2,...Nullpointer– Nullpointer2014-06-22 14:03:45 +00:00Commented Jun 22, 2014 at 14:03
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1What do you mean with 17 "Node" class objects? 17 objects of class Node or 17 classes inheriting from Node?blafasel– blafasel2014-06-22 14:04:09 +00:00Commented Jun 22, 2014 at 14:04
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1Use an array or a List. That's exactly what they're for: storing 0 to N references.JB Nizet– JB Nizet2014-06-22 14:09:59 +00:00Commented Jun 22, 2014 at 14:09
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1 Answer
Don't. What you are asking is a bad idea.
What you can do is add multiple new objects to an Array or Collection.
If you don't care about names an ArrayList<Node> will do the job.
If you do need names then make them keys in a HashMap<String, Node> or similar.
public List<Node> makeThisManyNodes(int count) {
List<Node> nodes = new ArrayList<Node>();
for (int i=0; i<count; i++) {
nodes.add(new Node());
}
return nodes;
}
static final String NODE_BASE_NAME = "node_%d";
public Map<String, Node> makeThisManyNodes(int count) {
Map<String, Node> nodes = new HashMap<String, Node>();
String key;
for (int i=0; i<count; i++) {
key = String.format(NODE_BASE_NAME, i);
nodes.put(key, new Node());
}
return nodes;
}
