Programming Fundamentals

In Java, 'public', 'static', and 'void' are reserved keywords that have special meaning in the language. 'main' is NOT a reserved keyword - it's simply the name of a method that is commonly used as the entry point for Java applications, but you could technically name a method 'main' in any class.

In Java, a valid method declaration requires a return type (or void), a method name, and a parameter list enclosed in parentheses, followed by the method body. void method2() { } correctly satisfies these syntax rules.

Generic code problems are handled at compile-time, not runtime. Java uses type erasure where generic type information is removed during compilation. By the time the code runs, generic types are replaced with their bounds or Object, making runtime generic type checking impossible.

{{}} is valid - it's a nested empty block. { continue; } is invalid because continue must be inside a loop. block: { break block; } is valid - labeled break can exit any labeled block. block: { continue block; } is invalid because continue requires an enclosing loop, not just a labeled block.

In JES2, the LINES parameter specifies output line limits and can be used with values like DUMP (dump output), CANCEL (cancel output), and WARNING (issue warning message). ABEND is not used with LINES - it's a separate job termination action.

Java keywords are reserved words with special meaning. 'switch' and 'default' are valid keywords. 'integer' is not a keyword (int is the primitive type). 'boolean' is a keyword (primitive type). 'object' is not a keyword (Object is a class).

In Java, NULL (should be null), extended (should be extends), and string (String is a class) are not keywords. 'implements' and 'protected' are valid Java keywords. Option B correctly identifies the three items that are not keywords.

In Java, 'switch' and 'default' are valid keywords. 'integer' is not a keyword (int is), 'boolean' is a valid keyword (primitive type), and 'object' is not a keyword (Object is a class). Option C correctly identifies the keywords.

In Java, implements and protected are keywords. NULL (all uppercase) is not a keyword (the literal is lowercase null), extended is not a keyword (the keyword is extends), and string is not a keyword (the class is String). Thus, (A), (D), and (E) are not keywords.

C++ prohibits overloading the sizeof operator (language built-in for memory size), scope resolution operator :: (fundamental to language syntax), and ternary operator ?: (conditional operator has special syntax rules). These operators are part of the core language and their behavior is fixed by the specification.

Compilers typically set the vtable entry for a pure virtual function to NULL. This ensures that attempting to call a pure virtual function directly (without overriding) results in a predictable error. The NULL entry indicates no implementation is available in this class. Abstract classes cannot be instantiated precisely because they have such NULL vtable entries.

NVL, NULLIF, and COALESCE are standard SQL functions designed specifically to handle NULL values. While DECODE can handle NULLs in its logic, it is primarily a conditional transformation function rather than a dedicated NULL-handling function like the others.

Java's core promise is 'Write Once, Run Anywhere' (WORA), enabled by the Java Virtual Machine (JVM). This means compiled Java code can run on any platform supporting JVM without recompilation. The other options are incorrect.

In C, you can define an anonymous structure and instantiate it immediately (struct { ... } var;). This is valid inside a function, and the code will print the assigned integer value 193149.

PL/SQL blocks have four sections: Header (optional, for named blocks), Declarative (DECLARE section for variables, types, cursors), Executable (BEGIN...END for main logic), and Exception (EXCEPTION section for error trapping and handling). The Exception section specifically contains functions and handlers for errors.