/**
* Returns <tt>true</tt> if and only if this state is considered equal to the given object. In
* particular, equality is defined to hold if the given object is also a <tt>State</tt> object, if
* it is associated with the same <tt>Puzzle</tt> object, and if the cars in both states are in
* the identical positions. This method overrides <tt>Object.equals</tt>.
*/
public boolean equals(Object o) {
State s;
try {
s = (State) o;
} catch (ClassCastException e) {
return false;
}
if (hashcode != s.hashcode || !puzzle.equals(s.puzzle)) return false;
for (int i = 0; i < varPos.length; i++) if (varPos[i] != s.varPos[i]) return false;
return true;
}
