7.3 Ap0030: self-assessment, relational operators, increment operator  (Page 4/9)

Miscellaneous

This section contains a variety of miscellaneous information.

Answers

Answer 15

C. 0 1 2 3 3

Explanation 15

No return statement is required

A method with a signature that specifies a void return type does not require a return statement.

However, such a method may contain a return statement, provided that it is terminated immediately with a semicolon (no expression between the word return and the semicolon) .

(Every method whose return type is not void must contain at least one return statement.)

Multiple return statements are allowed

Any method may contain any number of return statements provided that they make sense from a syntax viewpoint, and provided the expression (or lack thereof) between the word return and the semicolon evaluates to the type specified in the method signature (or a type that will be automatically converted to the type specified in the method signature) .

A return statement terminates a method immediately

Whenever the execution stream encounters any return statement, the method is terminated immediately, and control is returned to the method that called thatmethod.

Back to Question 15

Answer 14

A. Compiler Error

Explanation 14

Missing return statement

This program produces the following compiler error under JDK 1.3:

Even though this program contains a return statement inside the for loop, it is still necessary to place a return statement at the end of the method to satisfy the compiler. (The one shown in the code is a comment.)

The method named doLoop must return a value of type double . Apparently the compiler assumes that the return statement inside the for loop may never be executed (although that isn't true in this case) .

Both of the return statements must return a value that satisfies the double type requirement given in the method signature.