/**
* Resolves singletons.
*
* @return the singleton instance
*/
private Object readResolve() {
return Months.of(months);
}
/**
* Returns a new instance with the specified amount of time added.
*
* <p>This instance is immutable and unaffected by this method call.
*
* @param amount the amount of time to add, may be negative
* @return the new amount plus the specified amount of time, not null
* @throws ArithmeticException if the result overflows an {@code int}
*/
public Months plus(Months amount) {
return plus(amount.getAmount());
}
/**
* Returns a new instance with the specified amount of time subtracted.
*
* <p>This instance is immutable and unaffected by this method call.
*
* @param amount the amount of time to add, may be negative
* @return the new amount minus the specified amount of time, not null
* @throws ArithmeticException if the result overflows an {@code int}
*/
public Months minus(Months amount) {
return minus(amount.getAmount());
}
/**
* Returns a new instance of the subclass with a different number of months.
*
* @param amount the number of months to set in the new instance, may be negative
* @return a new period element, not null
*/
@Override
public Months withAmount(int amount) {
return Months.of(amount);
}