/** Source code example for "A Practical Introduction to Data
    Structures and Algorithm Analysis, 3rd Edition (Java)" 
    by Clifford A. Shaffer
    Copyright 2008-2011 by Clifford A. Shaffer
*/

/** Leaf node */
class VarLeafNode implements VarBinNode {
  private String operand;                 // Operand value

  public VarLeafNode(String val) { operand = val; }
  public boolean isLeaf() { return true; }
  public String value() { return operand; }
};