import java.util.*;

public class GeneralNode {

    private Object item;
    private LinkedList nodeList;
    
    public GeneralNode() {
	nodeList = new LinkedList();
    }
    
    public GeneralNode(Object item) {
	this.item=item;
	if (nodeList==null) 
	    nodeList = new LinkedList();
    }

    public void addNode(GeneralNode node) {
	nodeList.add(node);
    }



    // using pre-order for clarity:
    public String toString() { 
	String s = ""+item;
	Iterator it = nodeList.iterator(); 
	if (it.hasNext()) s += "(";
	while(it.hasNext()) {
	    s += it.next();
	    if (it.hasNext()) s += ",";	    
	    if (!it.hasNext()) s += ")";
	}
	return s;
    }

    // handier way to view tree, esp for debugging:
    public String toTree() { 
	return toTree("|   ","|___"); 
    } 
           
    public String toTree(String blank, String spacing) {
	String t = item.toString() + "\n";
	for ( Iterator it = nodeList.iterator(); it.hasNext(); ) {
	    if (it.hasNext()) {
		GeneralNode next = (GeneralNode) it.next();
		t += spacing + (next.toTree(blank, blank+spacing));
	    }
	}
	return t;
    }

}