Model 204 and Java Programming Quiz

Since Class Y is a subclass of Class X, an instance of Y can be implicitly upcast to a reference of type X. This is a fundamental polymorphic assignment in Java and compiles successfully.

The default case in a switch statement can appear anywhere within the switch block, not necessarily at the end. The Java Language Specification explicitly allows this flexibility in positioning.

To instantiate a non-static inner class, you must invoke the constructor on an instance of the outer class using the syntax new OuterClass().new InnerClass(), rather than calling InnerClass() directly on the outer class instance.

In Java, a method with no access modifier (package-private) can indeed be overridden by a method marked protected. This is valid because protected provides broader access than package-private, allowing subclasses (even in different packages) to access the method. The Liskov substitution principle permits widening access visibility in overriding methods.

In Java, when an array is constructed, its elements are automatically initialized to their default values (e.g., 0 for numeric types, false for booleans, and null for object references).

In Java, floating-point division by zero produces Infinity (positive or negative) rather than a runtime error. The code compiles successfully and executes without throwing an exception. Division by zero only throws ArithmeticException for integer types (int, long), not floating-point types (float, double).

In Model 204 User Language, FPC is the standard and recognized abbreviation for the FIND AND PRINT COUNT command.

END NORUN terminates the current request and returns control to the command level without executing any further statements. This is different from END which just ends the current block, and CANCEL which aborts the current operation.

The statement RELEASE RECORDS ON LIST ABC empties the list. Therefore, when COUNT RECORDS ON LIST ABC is executed subsequently, the count of records on the list is zero.

In Model 204 query language, the correct syntax for range selection uses 'IS BETWEEN' - the field name followed by IS BETWEEN the lower and upper bounds. The keyword IS is required for proper syntax.

STORE RECORD is the correct statement in Model 204 for adding new records to a file. The STORE command combined with RECORD specifies that a complete record should be stored.

The ADD statement is used to add new field values to an existing record in Model 204. This is different from STORE which creates new records.

In Model 204, global variables are highly versatile and can be used to pass information between requests, conditionally include procedures, and dynamically tailor requests.

Functions in Model 204 procedures are prefixed with the question mark (?). This distinguishes them from variables and other language elements.

$DEBLANK is the Model 204 function that removes leading and trailing whitespace from a string. $STRIP is not a valid function, $DECODE translates encoded values, and $EDIT is for formatting.

$EDIT formats the number 25.734 to 2 decimal places (25.73) then pads with leading zeros to match the pattern width. The pattern '99999.99' requires 5 digits before the decimal, so 25.73 becomes 00025.73.

The Model 204 $VNUM function extracts a numeric value from a string. If the string contains non-numeric characters trailing the number (like 'AB'), $VNUM returns 0 because the string does not represent a clean numeric value.

The code places records from the find operation onto LIST ABC and labels them with A. COUNT RECORDS ON LIST ABC counts these records. Since LIST ABC contains exactly the records labeled A, both statements are equivalent - the count equals both the number on LIST ABC and the number in label A.

END SUBROUTINE is the correct statement to mark the end of a subroutine block in Model 204. The keyword order matters - END comes before SUBROUTINE.

SUBROUTINE is the statement that begins a subroutine definition in Model 204. You specify SUBROUTINE followed by the subroutine name to start the block.