When we create ArrayList such
ArrayList<String> obj = new ArrayList<String>();
We are creating a ArrayList of type String and a reference to this object by the name obj. What about this?
ArrayList<Node> obj;
A ArrayList of type Node with only the reference that is pointing to null? What does this statement look like in memory?
Example:
import java.util.List;
public class PackageNode {
private String value;
private List<PackageNode> children;
public PackageNode(String value) {
this.value = value;
}
public String getValue() {
return value;
}
public void setValue(String value) {
this.value = value;
}
public List<PackageNode> getChildren() {
return children;
}
public void setChildren(List<PackageNode> children) {
this.children = children;
}
}
Assume the code above is a Node class for a PackageTree, What does this mean?
List<PackageNode> children;
