Free Software Design and Architecture MCQs with Answers

• A. Two type are compatible and size of destination type is equal of source type.
• B. Two type are compatible and size of destination type is larger than source type.
• C. Two type are compatible and size of destination type is shorter than source type.
• D. All of the above

Explanation: Automatic conversion is widening conversion: the source and destination types must be compatible, and the destination must be able to…

• A. Multiple inheritance
• B. Multilevel inheritance
• C. Hierarchical inheritance
• D. None of above

Explanation: Java classes cannot extend multiple classes, but a class can implement multiple interfaces, which provides multiple inheritance of type…

• A. Classes and Interfaces
• B. Classes
• C. Editing tools
• D. Editing tools and Interfaces

Explanation: A Java package groups related classes and interfaces under a common namespace, helping organization, access control, and avoidance of name…

• A. Input stream class
• B. Object class
• C. Math class
• D. None of above

Explanation: pow() is a static method of Java's Math class and computes one number raised to the power of another.

• A. JNI
• B. FJI
• C. NJI
• D. JFI

Explanation: JNI, or Java Native Interface, allows Java code to invoke native code and allows native applications to invoke Java methods through the…

• A. Prints 2.5
• B. Raises an exception
• C. Raises an error as STATIC is used as a variable which is a keyword
• D. None of these

Explanation: STATIC is a legal identifier because Java keywords are lowercase and STATIC is not a keyword.

• A. Object
• B. Variable
• C. Class
• D. Method

Explanation: String is a predefined Java class used to represent sequences of characters.

• A. 0
• B. 1
• C. 2
• D. 3

Explanation: A running Java application has at least one thread, normally the main thread that begins execution of main().

• A. yield() method
• B. Suspend() method
• C. start() method
• D. resume() method

Explanation: The deprecated suspend operation pauses a thread, and resume() releases that suspended state.

• A. signed
• B. unsigned
• C. Both of the above
• D. None of these

Explanation: Java's byte, short, int, and long primitive integer types all use signed two's-complement representation.

• A. println
• B. final
• C. super
• D. static

Explanation: A method declared with the `final` modifier cannot be overridden in a subclass.

• A. java.io package
• B. java.lang package
• C. java.awt package
• D. java.util package

Explanation: `gc()` is associated with `System.gc()`, and the `System` class belongs to the `java.lang` package, which Java imports automatically.

• A. A Boolean literal
• B. A Java keyword
• C. Same as value 0
• D. Same as value 1

Explanation: `true` is a Boolean literal in Java, alongside `false`; it is not a keyword and Java does not treat it as numeric 0 or 1.

• A. Declare the method with the keyword public.
• B. Declare the method with the keyword private.
• C. Do not declare the method with any accessibility modifiers.
• D. Declare the method with the keyword public and private.

Explanation: A method with no access modifier has package-private access, so it can be used by classes in the same package but not by classes in other…

• A. java dissasamebler
• B. java header file
• C. java interpreter
• D. java compiler

Explanation: `javah` was the Java tool used to generate native-method header files, hence the intended expansion is Java header file.

• A. java
• B. javac
• C. javap
• D. none of these

Explanation: `javac` is the Java compiler command: it translates `.java` source files into bytecode `.class` files.

• A. 8 bit
• B. 16 bit
• C. 32 bit
• D. 64 bit

Explanation: Java defines an int as a signed 32-bit primitive regardless of the machine or JVM implementation. Its range is -2^31 to 2^31 - 1.

• A. 7 8
• B. 8 7
• C. 9 8
• D. None

Explanation: A leading zero makes an integer literal octal in Java, so 010 equals decimal 8 and 07 equals decimal 7.

• A. From within protected methods you do not have access to public methods.
• B. This method is only accessible from inside the class itself and from inside all subclasses.
• C. In a class, you cannot declare methods with a lower visibility than the visibility of the class in which it is defined.
• D. This method is accessible from within the class itself and from within all classes defined in the same package as the class itself.

Explanation: A protected method is accessible within its own class and by classes in the same package, as stated in option d.

• A. just in time
• B. java in time
• C. join in time
• D. none of above

Explanation: JIT stands for Just-In-Time compilation, in which frequently executed bytecode is compiled into native machine code during program…