Using if/else statements in setters

Question

in my UML it is telling me to not let the field update if the value is negative

public void setCurrentBalance(double currentBalance)
{
    if (currentBalance <= 0)
        this.currentBalance = currentBalance;
    else
        this.currentBalance = currentBalance;
}

Does this look correct if my constructor looks like:

    setAccountNumber(accountNumber);
    setOwnerFirstName(ownerFirstName);
    setOwnerLastName(ownerLastName);
    setCurrentBalance(currentBalance);
    setMinimumBalanceRequired(minimumBalanceRequired);