Don't implement #equals using just a hashCode comparison:
class MyClass {
private final int a;
private final int b;
private final String c;
...
@Override
public boolean equals(@Nullable Object o) {
return o.hashCode() == hashCode();
}
@Override
public int hashCode() {
return Objects.hashCode(a, b, c);
}The number of Objects with randomly distributed hashCode required to give a
50% chance of collision (and therefore, with this pattern, erroneously correct
equality) is only ~77k.