Java Expressions and Assignments

public class NodeAddop extends Node { private String addop; public NodeAddop(int pos, String addop) { this.pos=pos; this.addop=addop; } public int op(int o1, int o2) throws EvalException { if (addop.equals("+")) return o1+o2; if (addop.equals("-")) return o1-o2; throw new EvalException(pos,"bogus addop: "+addop); } }