How to use Set as field of my object?

Question

public class FileSystem implements Serializable{
    private Node current;
    private final Node root;
    private Node iterator;
    private Node source;
    private Node tempNode;
    private Set<String> commandSet;
    /** Creates a new instance of FileSystem */
  public FileSystem() {
        FileSystemObject fso=new FileSystemObject("/",true);
        NodeItem ni=new NodeItem(fso,"d"+fso.getName());
        Node node=new Node();
        node.setNodeItem(ni);
        root = current = node;
        commandSet=Collections.;
        commandSet.add("pwd");
        commandSet.add("cd");
        commandSet.add("ls");
        commandSet.add("mkfile");
        commandSet.add("mkdir");
        commandSet.add("cp");
        commandSet.add("cpdir");
        commandSet.add("mv");
        commandSet.add("mvdir");
        commandSet.add("rm");
        commandSet.add("rmdir");
        pwd();
    }  As you can see from the above code i have a Set field named commandSet for my FileSystem Object .. in order to be able to write a code like :
if(commandSet.contains(String str)) somewhere in my program how must i initialize this Set... the commandSet is i&#351;ntended to be a set of Strings..

Answer 1

duffymo wrote:
I thought the two were pretty similar. What's "so much easier"?
%There are similarities syntactically they have a great deal in common. C# does things to try to be helpful that I find onerous and distasteful. As an example we (as java developers) take accessor and mutator methods for granted. If I want to get the value of the the framitz member data I'm going to call getFramitz(). This is a given that we accept as cannon. C# however wraps the call to the accessors and mutators and takes care of that little detail so the code
Widget w = new Widget() ;
w.framitz ;might be calling an accessor method under the hood (without telling you) or it could be accessing a public member directly without calling an accessor. This sort of help I neither want nor need.
This is the sort of thing about .Net in general that drives me insane and makes me not want to use it.
PS.