1 public class MyNode 2 { 3 /** Symbol table */ 4 protected static java.util.Hashtable symtab = new java.util.Hashtable(); 5 6 /** Stack for calculations. */ 7 protected static Object[] stack = new Object[1024]; 8 protected static int top = -1; 9 10 public void interpret() 11 { 12 throw new UnsupportedOperationException(); // It better not come here. 13 } 14 } 15