13 hashCode = hashCode * 31 + a.hashCode();
14 hashCode = hashCode * 31 + b.hashCode();
26 public int hashCode() {
30 public boolean equals(Object o) {
31 if (o instanceof Pair) {
33 if (a.equals(i.getFirst()) && b.equals(i.getSecond())) {
40 public String toString() {
41 return "<" + a + "," + b + ">";