Java 7 for Absolute Beginners

CHAPTER 4 ■ OPERATORS

this.lastName = lastName;
this.favoriteBook = favoriteBook;
}

public boolean equals(Person p) {
if (p == null) {
return false;
}
if (p == this) {
return true;
}
if (!(p instanceof Person)) {
return false;
}
if (p.lastName.equals(this.lastName)
&& p.firstName.equals(this.firstName)) {
return true;
} else {
return false;
}
}

public int hashCode() {
int result = 17;
result = firstName.hashCode() 37;
result = lastName.hashCode() 37;
return result;
}

public int compareTo(Person p) {
// sort by last name first
if (lastName.compareTo(p.lastName) > 0) {
return 1;
}
if (lastName.compareTo(p.lastName) < 0) {
return -1;
}
// last names must be equal
// so compare first names
if (firstName.compareTo(p.firstName) > 0) {
return 1;
}
if (firstName.compareTo(p.firstName) < 0) {
return -1;
}
// both names must be equal
return 0;
}
}

And Listing 4-32 shows the book comparator class.