Errata for Java in a Nutshell

The declaration omits a type, "public static final DAYS_PER_WEEK = 7;" now reads: "public static final int DAYS_PER_WEEK = 7;"

The declaration omits a type, "public static final DAYS_PER_WEEK = 7;" now reads: "public static final int DAYS_PER_WEEK = 7;"

The comment about long/integer arithmetic in the method body is correct, but the code does not perform long arithmetic. There are three subtractions, each of which are done on integer values and thus will overflow for a large positive value minus a very negative value or vice versa. (The assignment to a long is a widening conversion (pp 26-27) but the widening conversion is not applied to the subexpressions. long result = that.y - this.y; // Smaller circles have bigger y values if (result == 0) result = this.x - that.x; // If same compare l-to-r if (result == 0) result = this.r - that.r; // If same compare radius now reads: long result = (long)that.y-this.y; // Smaller circles have bigger y if (result==0) result = (long)this.x-that.x; // If same compare l-to-r if (result==0) result = (long)this.r-that.r; // If same compare radius

The comment about long/integer arithmetic in the method body is correct, but the code does not perform long arithmetic. There are three subtractions, each of which are done on integer values and thus will overflow for a large positive value minus a very negative value or vice versa. (The assignment to a long is a widening conversion (pp 26-27) but the widening conversion is not applied to the subexpressions. long result = that.y - this.y; // Smaller circles have bigger y values if (result == 0) result = this.x - that.x; // If same compare l-to-r if (result == 0) result = this.r - that.r; // If same compare radius now reads: long result = (long)that.y-this.y; // Smaller circles have bigger y if (result==0) result = (long)this.x-that.x; // If same compare l-to-r if (result==0) result = (long)this.r-that.r; // If same compare radius

The corrected version follows: // Compute monthly interest payments on a loan public static BigDecimal monthlyPayment(int amount, // amount of loan int years, // term in years double apr) // annual interest % { // BigDecimal can compute arbitrary precision results. // But this causes problems with repeating decimals on division, // and can take a long time for exponentiation. So we use a // MathContext to specify how much precision we want MathContext c = MathContext.DECIMAL128; // Convert the loan amount to a BigDecimal BigDecimal principal = new BigDecimal(amount); // Convert term of loan in years to number of monthly payments int payments=years*12; // Convert interest from annual percent to a monthly decimal BigDecimal interest = BigDecimal.valueOf(apr); interest = interest.divide(new BigDecimal(100)); // as fraction interest = interest.divide(new BigDecimal(12), c); // monthly // The monthly payment computation BigDecimal x = interest.add(BigDecimal.ONE).pow(payments, c); BigDecimal y = principal.multiply(interest).multiply(x); BigDecimal monthly = y.divide(x.subtract(BigDecimal.ONE), c); // Convert to two decimal places monthly = monthly.setScale(2, RoundingMode.HALF_EVEN); return monthly; } ########################################

@returns -> @return ########################################

Under the horizontal rule is @Retention(RUNTIME), but in the last paragraph about Deprecated, the text says has source retention. "This annotation type has source retention" now reads: "This annotation type has runtime retention."

Under the horizontal rule is @Retention(RUNTIME), but in the last paragraph about Deprecated, the text says has source retention. "This annotation type has source retention" now reads: "This annotation type has runtime retention."

"This class provides an object wrapper around the short primitive type." now reads: "This class provides an immutable object wrapper around the short primitive type."

"This class provides an object wrapper around the short primitive type." now reads: "This class provides an immutable object wrapper around the short primitive type."

"calling its getDOMImplementation() object" now reads: "calling its getDOMImplementation() method."

"calling its getDOMImplementation() object" now reads: "calling its getDOMImplementation() method."

Missing reference to page 70 (section "Covariant return types")