Online Test On OOP Using Java

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  • 1/71 Questions

     What is a loop ?

    •  A new type of Applet
    •  A segment of code to be run a specified amount of times
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Online Test On OOP Using Java - Quiz
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  • 2. 

    Java runs on _______.

    • Windows

    • Unix/Linux

    • Mac

    • All of the Above

    Correct Answer
    A. All of the Above
    Explanation
    Java is a platform-independent language, which means it can run on multiple operating systems including Windows, Unix/Linux, and Mac. The Java Virtual Machine (JVM) allows Java programs to be executed on different platforms without the need for recompilation. Therefore, the correct answer is "All of the Above" as Java can run on all the mentioned operating systems.

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  • 3. 

    WHAT IS AN APPLET?

    • A JAVA PROGRAM THAT IS RUN THROUGH A WEB BROWSER

    •  A type of coffee

    Correct Answer
    A. A JAVA PROGRAM THAT IS RUN THROUGH A WEB BROWSER
    Explanation
    An applet is a Java program that is designed to be executed within a web browser. It is a small application that is typically embedded in a web page and runs on the client-side. Applets are used to provide dynamic and interactive content on websites. They can perform various tasks such as animations, data processing, and user input handling. By running within a web browser, applets can be easily accessed and executed by users without the need for additional installations or configurations.

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  • 4. 

    Java runs on _______.

    •  Windows

    • All of the Above

    •  Unix/Linux

    Correct Answer
    A. All of the Above
    Explanation
    Java is a platform-independent programming language, which means it can run on multiple operating systems including Windows, Unix/Linux, and others. Therefore, the correct answer is "All of the Above" as Java can run on all the mentioned operating systems.

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  • 5. 

    What is Java (in regard to Computer Science) ?

    •  A type of coffee

    • AN OBJECT-ORIENTED PROGRAMMING LANGUAGE

    Correct Answer
    A. AN OBJECT-ORIENTED PROGRAMMING LANGUAGE
    Explanation
    Java is an object-oriented programming language widely used in computer science. It was developed by Sun Microsystems and is known for its platform independence, meaning that Java programs can run on any device that has a Java Virtual Machine. Java is popular for its simplicity, robustness, and security features. It is used to develop a wide range of applications, including web and mobile applications, enterprise software, and embedded systems. Java's object-oriented nature allows for the creation of reusable code and promotes modular and scalable software development.

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  • 6. 

     If you want your conditional to depend on two conditions BOTH being true, what is the proper notation to put between the two Boolean statements ?

    • &&

    • !!

    Correct Answer
    A. &&
    Explanation
    The proper notation to put between two Boolean statements when you want your conditional to depend on both conditions being true is "&&". This is the logical operator for "and" in many programming languages. It evaluates to true only if both conditions are true, otherwise, it evaluates to false.

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  • 7. 

    What is a function in terms of Computer Science ?

    •  A group of code lines that performs a specific task

    •  Something that contains an ‘init’

    Correct Answer
    A.  A group of code lines that performs a specific task
    Explanation
    A function in computer science is a group of code lines that performs a specific task. It is a way to organize and modularize code by breaking it down into smaller, reusable units. Functions can be called and executed multiple times throughout a program, making it easier to maintain and debug code. They can also accept input parameters and return output values, allowing for flexibility and reusability in programming.

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  • 8. 

     Booleans are _______.

    •  True or False

    •  Single characters

    Correct Answer
    A.  True or False
    Explanation
    Booleans are data types that can have one of two values: true or false. They are used to represent logical values and are commonly used in programming to make decisions and control the flow of a program.

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  • 9. 

    If you want your conditional to depend on two conditions BOTH being true, what is the proper notation to put between the two Boolean statements ?

    • &

    • &&

    • |

    • ||

    Correct Answer
    A. &&
    Explanation
    The proper notation to put between two Boolean statements if you want your conditional to depend on both conditions being true is "&&". This is the logical AND operator in many programming languages. It returns true only if both conditions on either side of it are true.

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  • 10. 

    What is an assignment statement ?

    • Assigning a name to a variable

    • Assigning a value to a variable

    Correct Answer
    A. Assigning a value to a variable
    Explanation
    An assignment statement is a statement that assigns a value to a variable. It is used to store a value in a variable so that it can be used later in the program. By assigning a value to a variable, we are giving it a specific data value that can be manipulated or used in calculations or comparisons. This allows us to store and manipulate data in a program, making it an essential concept in programming.

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  • 11. 

    Which of the following means that in order for the conditional to happen, either x must be less than 3 or y must be greater than or equal to 4 ?

    •  if ((x < 3) || (y > = 4))

    •  if ((x > 3) || (y < = 4))

    Correct Answer
    A.  if ((x < 3) || (y > = 4))
    Explanation
    The correct answer is "if ((x < 3) || (y >= 4))". This means that for the conditional statement to be true, either x must be less than 3 or y must be greater than or equal to 4.

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  • 12. 

    What is the main function of any variable ?

    •  To add numbers together

    •  To keep track of data in the memory of the computer

    Correct Answer
    A.  To keep track of data in the memory of the computer
    Explanation
    The main function of any variable is to keep track of data in the memory of the computer. Variables are used to store and manipulate data in computer programs. They provide a way to assign values to a specific location in memory, which can then be accessed and modified throughout the program. By using variables, programmers can store and retrieve data as needed, making it an essential aspect of programming.

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  • 13. 

    Which of the following means that in order for the conditional to happen, either x must be less than 3 or y must be greater than or equal to 4 ?

    • If ((x < 3) && (y > 4))

    • If (x < 3 y >= 4)

    • If ((x < 3) || (y > = 4))

    • If ((x > 3) || (y < = 4))

    Correct Answer
    A. If ((x < 3) || (y > = 4))
    Explanation
    The correct answer is "if ((x < 3) || (y >= 4))". This means that in order for the conditional statement to be true, either x must be less than 3 or y must be greater than or equal to 4. The "||" operator represents logical OR, so either condition can be true for the entire statement to be true.

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  • 14. 

    What is the proper way to declare a variable ?

    • VariableName variableType;

    • VariableType variableName;

    Correct Answer
    A. VariableType variableName;
    Explanation
    The proper way to declare a variable is by specifying the variable type followed by the variable name. This allows the compiler to allocate the appropriate amount of memory for the variable based on its type.

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  • 15. 

    Synchronized is a keyword to tell a Thread to grab an Object lock before continuing execution.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    The explanation for the given correct answer is that the "synchronized" keyword in Java is used to ensure that only one thread can access a block of code or an object at a time. When a thread encounters a synchronized block or method, it grabs the object lock associated with that block or method and other threads have to wait until the lock is released. This helps in preventing multiple threads from accessing and modifying shared data simultaneously, thereby ensuring thread safety and avoiding race conditions. Therefore, the statement that "synchronized is a keyword to tell a Thread to grab an Object lock before continuing execution" is true.

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  • 16. 

    Following code will result in: int a = 3.5;

    • Compilation error

    • Runtime error

    Correct Answer
    A. Compilation error
    Explanation
    The given code will result in a compilation error because it is trying to assign a floating-point value (3.5) to an integer variable (a). In Java, this is not allowed without explicit type casting.

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  • 17. 

    What's the difference between an Applet and an application ?

    • Applets can paint words, applications cannot.

    •  Applets are run over the web.

    Correct Answer
    A.  Applets are run over the web.
    Explanation
    An applet is a small program that is designed to be run within another application or through a web browser. It is typically used to enhance the functionality of a website. On the other hand, an application is a standalone program that is installed and run directly on a computer or device. The key difference between an applet and an application is that applets are specifically designed to be run over the web, while applications are not limited to web-based environments. Therefore, the correct answer is that applets are run over the web.

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  • 18. 

    What is essential in making sure that your loop is not infinite ?

    • That there is a Boolean statement somewhere in your code

    • That your Boolean statement will at some point be false

    Correct Answer
    A. That your Boolean statement will at some point be false
    Explanation
    In order to ensure that a loop is not infinite, it is essential to have a Boolean statement somewhere in the code that will eventually be false. This allows the loop to terminate and prevents it from running indefinitely. Without a condition that can evaluate to false, the loop will continue to repeat indefinitely, resulting in an infinite loop.

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  • 19. 

    Which keyword is used to inherit class?

    • Inherit

    • Extends

    • Inheritance

    • Extend

    Correct Answer
    A. Extends
    Explanation
    The keyword "extends" is used to inherit a class in object-oriented programming. When a class extends another class, it means that the subclass inherits all the properties and methods of the superclass. This allows the subclass to reuse code from the superclass and also add its own unique functionality. Therefore, "extends" is the correct keyword to indicate inheritance in Java and other similar languages.

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  • 20. 

    What's the difference between an Applet and an application ?

    • None of the above.

    • Applets are run over the web.

    • Applets can paint words, applications cannot.

    • An application is only available on Windows

    Correct Answer
    A. Applets are run over the web.
    Explanation
    Applets are a type of program that can be run within a web browser, whereas applications are standalone programs that are installed and run on a computer's operating system. This means that applets can be accessed and executed through a web page, while applications require installation and can be run independently. Therefore, the correct answer is that applets are run over the web.

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  • 21. 

    What is an Applet ?

    • A Java program that does not run through a web browser

    • A Java program that is run through a web browser

    • An object-oriented programming language

    • An interactive website

    Correct Answer
    A. A Java program that is run through a web browser
    Explanation
    An applet is a Java program that is designed to run within a web browser. It is embedded within an HTML page and is executed on the client-side, meaning it runs on the user's computer rather than on a server. Applets are used to create interactive and dynamic content on web pages, such as animations, games, or data visualizations. They have limited access to system resources and are subject to certain security restrictions to ensure the safety of the user's computer.

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  • 22. 

    Methods that are marked protected can be called in any subclass of that class.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Protected methods in a class can be accessed by any subclass of that class. This means that if a method is marked as protected in a superclass, it can be called and used in any subclass that extends that superclass. This allows for inheritance and the ability to override or modify the behavior of the protected method in the subclass. Therefore, the statement "Methods that are marked protected can be called in any subclass of that class" is true.

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  • 23. 

    Synchronized is a keyword to tell a Thread to grab an Object lock before continuing execution.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    The explanation for the given correct answer is that the "synchronized" keyword in Java is used to achieve thread synchronization. When a method or a block of code is declared as synchronized, it means that only one thread can access that method or block at a time. This ensures that the shared resources are accessed in a mutually exclusive manner, preventing any data inconsistencies or race conditions. Therefore, the statement that synchronized is a keyword to tell a Thread to grab an Object lock before continuing execution is true.

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  • 24. 

    Primitive datatypes are allocated on a stack

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Primitive datatypes are allocated on a stack. This means that when a primitive datatype is declared, memory is allocated for it on the stack. The stack is a region of memory that is used for temporary storage of variables. When a variable goes out of scope, the memory allocated for it on the stack is automatically released. This is different from objects, which are allocated on the heap and require manual memory management.

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  • 25. 

    The methods wait(), notify() and notifyAll() in Object need to be called from synchronized pieces of code.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    The methods wait(), notify(), and notifyAll() in the Object class need to be called from synchronized pieces of code because they are used for inter-thread communication and coordination. When a thread calls the wait() method, it releases the lock on the object and waits for another thread to notify it. Similarly, the notify() and notifyAll() methods are used to wake up waiting threads. To ensure proper synchronization and avoid race conditions, these methods should be called within synchronized blocks or methods.

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  • 26. 

    The methods wait(), notify() and notifyAll() in Object need to be called from synchronized pieces of code.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    The methods wait(), notify(), and notifyAll() in the Object class are used for inter-thread communication and synchronization. They are designed to be called from synchronized blocks or methods. When a thread calls wait(), it releases the lock it holds and enters a waiting state until another thread notifies it. Similarly, notify() and notifyAll() are used to wake up threads that are waiting. To ensure proper synchronization and avoid race conditions, these methods should only be called within synchronized code blocks or methods. Therefore, the statement is true.

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  • 27. 

    The following prototype shows that a Cylinder subclass is derived from a superclass called Circle

    • Class Circle extends Cylinder

    • Class Cylinder derived Circle

    • Class Cylinder extends Circle

    • Class Circle derived Cylinder

    Correct Answer
    A. Class Cylinder extends Circle
    Explanation
    The correct answer is "class Cylinder extends Circle". This means that the class "Cylinder" is derived from the superclass "Circle". In object-oriented programming, inheritance is used to create a subclass that inherits the properties and methods of a superclass. In this case, the subclass "Cylinder" is inheriting from the superclass "Circle", which suggests that a cylinder is a type of circle with additional properties or methods specific to cylinders.

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  • 28. 

     Following code will result in: int a = 9/0;

    • Compilation error: Divisions must be in a try block.

    • Runtime Exception

    Correct Answer
    A. Runtime Exception
    Explanation
    The given code will result in a runtime exception because it is trying to divide 9 by 0, which is not a valid operation in mathematics. This will throw an ArithmeticException at runtime.

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  • 29. 

    Can you compare a boolean to an integer?

    • Yes

    • No

    Correct Answer
    A. No
    Explanation
    A boolean is a data type that represents two possible values: true or false. An integer, on the other hand, is a data type that represents whole numbers. These two data types are not compatible for direct comparison because they represent different concepts. In most programming languages, attempting to compare a boolean to an integer would result in a type mismatch error. Therefore, the correct answer is "No".

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  • 30. 

    What does AWT stands for ?

    •  Abstract window Toolkit

    •  Adjust Window Toolkit

    Correct Answer
    A.  Abstract window Toolkit
    Explanation
    AWT stands for Abstract Window Toolkit. It is a set of application programming interfaces (APIs) provided by Java for creating graphical user interfaces (GUIs) for Java programs. AWT provides a platform-independent way of creating windows, buttons, menus, and other GUI components. It is a part of the Java Foundation Classes (JFC) and is used to develop GUI-based applications in Java.

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  • 31. 

    Which is right way to creating an array of integer in java?

    • Int javaArray = new int[10];

    • Int avaArray new = myArray[ ];

    • Int[] javaArray = new int[10];

    • None

    Correct Answer
    A. Int[] javaArray = new int[10];
    Explanation
    The correct way to create an array of integers in Java is by using the syntax "int[] javaArray = new int[10];". This creates an array named "javaArray" with a length of 10, capable of storing integer values. The other options provided in the question are incorrect. "int javaArray = new int[10];" is incorrect because it declares a single integer variable instead of an array. "int avaArray new = myArray[ ];" is incorrect because it contains syntax errors and does not create an array. "none" is also incorrect because there is a correct way to create an array in Java.

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  • 32. 

    Which of the java classes that cannot be subclassed?

    • Abstract class

    • Public class

    • Final class

    • None of above

    Correct Answer
    A. Final class
    Explanation
    A final class in Java cannot be subclassed because it is marked with the "final" keyword, which indicates that it cannot be extended. This is often done to prevent further modification or extension of the class, ensuring that its behavior remains consistent and preventing any unintended changes that may break its functionality. Therefore, a final class is considered to be a complete and final implementation that cannot be altered or extended by any other class.

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  • 33. 

    An abstract class can have non-abstract methods

    • True

    • False

    Correct Answer
    A. True
    Explanation
    An abstract class can have non-abstract methods because an abstract class is a class that cannot be instantiated and is meant to be extended by other classes. It can contain both abstract and non-abstract methods. Non-abstract methods in an abstract class can have a complete implementation and can be directly called by the subclasses that inherit from the abstract class. This allows the abstract class to provide common functionality to its subclasses while still allowing the subclasses to implement their own unique functionality.

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  • 34. 

    You can construct a new Color by providing 3 integers that represent ___________, ___________, and ____________ colors

    • Red, Orange, Green

    • Blue, Green, Yellow

    • Red, Green, Blue

    • Black, White and Blue

    Correct Answer
    A. Red, Green, Blue
    Explanation
    The correct answer is Red, Green, Blue. This is because these three integers represent the primary colors in the RGB color model. In this model, different intensities of red, green, and blue are combined to create a wide range of colors. By providing these three integers, you can create a new Color object with a specific RGB color.

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  • 35. 

    With inheritance, a derived subclass object can directly access any

    • Public or private superclass member

    • Private superclass member

    • Public superclass member (and protected subclass members if it's in the same package)

    • Protected, public or private superclass member

    Correct Answer
    A. Public superclass member (and protected subclass members if it's in the same package)
    Explanation
    Inheritance allows a derived subclass object to directly access any public superclass member. Additionally, if the subclass is in the same package as the superclass, it can also access protected subclass members. However, private superclass members cannot be accessed by the subclass object. Therefore, the correct answer is "public superclass member (and protected subclass members if it's in the same package)".

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  • 36. 

    In a ‘for’ loop, what section of the loop is not included in the parentheses after “for” ?

    •  Loop Body

    •  Initialization

    Correct Answer
    A.  Loop Body
    Explanation
    In a 'for' loop, the section of the loop that is not included in the parentheses after 'for' is the Loop Body. The loop body contains the code that is executed repeatedly until the loop condition is false. The initialization section, on the other hand, is included in the parentheses after 'for' and is responsible for initializing the loop control variable.

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  • 37. 

    How can you prevent a member variable from becoming serialized?

    • By marking it volatile

    • By marking it transient

    Correct Answer
    A. By marking it transient
    Explanation
    By marking a member variable as transient, it indicates to the serialization process that this variable should not be serialized. This is useful when there are certain variables that should not be saved or transmitted when an object is being serialized. The transient keyword allows for control over which variables are included in the serialization process, preventing the member variable from being serialized. The volatile keyword, on the other hand, is used for ensuring that the value of a variable is always read from the main memory and not from a cache, and it does not have any direct relation to serialization.

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  • 38. 

    An abstract class should have methods all declared abstract?

    • Yes

    • No

    Correct Answer
    A. No
    Explanation
    An abstract class can have both abstract and non-abstract methods. It is not necessary for all methods in an abstract class to be declared as abstract. Abstract methods are those that do not have any implementation and must be overridden by the subclasses. Non-abstract methods in an abstract class can have their own implementation and can be used by the subclasses without any modification. Therefore, an abstract class should not have all methods declared as abstract.

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  • 39. 

    Following code will result in: class A { int b = 1; public static void main(String [] args) { System.out.println("b is " + b); }}

    • Compilation error

    • Runtime Error

    Correct Answer
    A. Compilation error
    Explanation
    The given code will result in a compilation error because the variable "b" is declared as an instance variable within the class A, but it is being accessed in the static main method. Since the main method is a static method, it does not have access to instance variables directly. To access the variable "b" in the main method, it either needs to be declared as a static variable or an instance of class A needs to be created to access the instance variable.

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  • 40. 

    Inner classes can be defined within methods

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Inner classes can be defined within methods in Java. An inner class is a class that is defined inside another class. It can be defined within a method, allowing it to have access to the variables and methods of the enclosing method. This can be useful in situations where a class is only needed within a specific method and does not need to be accessed outside of it. By defining the inner class within the method, it keeps the code more organized and encapsulated.

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  • 41. 

    In which memory area of JVM objects will be created?

    • Heap Memory

    • Stack memory

    • Method area

    • None

    Correct Answer
    A. Heap Memory
    Explanation
    Objects in Java are created in the Heap memory area of the JVM. The Heap memory is a region of memory that is shared among all threads and is used for dynamic memory allocation. When an object is created using the "new" keyword, memory is allocated in the Heap for that object. The Heap memory is managed by the garbage collector, which automatically frees up memory for objects that are no longer in use.

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  • 42. 

    Inner classes can be defined within methods.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Inner classes can be defined within methods. This means that a class can be declared inside a method of another class. This is useful when the inner class is only needed within that specific method and does not need to be accessed or used outside of it. By defining an inner class within a method, it allows for better encapsulation and organization of code.

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  • 43. 

    Following code will result in: int a1 = 5; double a2 = (float)a1;

    • Runtime error

    • No errors

    Correct Answer
    A. No errors
    Explanation
    The code will not result in any errors because it is a valid type casting operation. The value of the integer variable a1 is being explicitly casted to a float type and then assigned to the double variable a2. Since the float type can be safely promoted to a double type without any loss of precision, the code will execute without any errors.

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  • 44. 

    The applet can  received the parameter values using the method ___________

    • GetParam()

    • GetParameter()

    • SetParam()

    • SetParameter()

    Correct Answer
    A. GetParameter()
    Explanation
    The applet can receive the parameter values using the method getParameter(). This method allows the applet to retrieve the values of parameters that are passed to it. By using getParameter(), the applet can access and use these parameter values for various purposes within its functionality.

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  • 45. 

    How can you prevent a member variable from becoming serialized?

    • By marking it private

    • By marking it volatile

    • By marking it transient

    • You can not.

    Correct Answer
    A. By marking it transient
    Explanation
    A transient variable is a variable that may not be serialized.

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  • 46. 

    Following code will result in: class A { public static void main(String [] args) {B b = new A(); }} class B extends A {}

    • Compile error

    • Runtime Exception

    • No error

    • No Output

    Correct Answer
    A. Compile error
    Explanation
    The given code will result in a compile error because the line "B b = new A();" is trying to create an object of class A and assign it to a variable of type B. Since B is a subclass of A, it is valid to assign an object of type B to a variable of type A, but the reverse is not true. Therefore, the code will not compile.

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  • 47. 

    The default statement of a switch is always executed

    • True

    • False

    Correct Answer
    A. False
    Explanation
    The default statement of a switch is not always executed. The default statement is only executed when none of the cases match the value being tested. If a case matches the value, the corresponding statement is executed and the program exits the switch statement. If there is no default statement, the program simply continues to the next line of code after the switch statement. Therefore, the correct answer is False.

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  • 48. 

    Following code will result in: class A { public static void main(String [] args) {A a = new B(); }} class B extends A {}

    • Runtime Exception

    • No errors

    Correct Answer
    A. No errors
    Explanation
    The code will not result in any errors because class B extends class A, so it is valid to assign an instance of class B to a variable of type A. The code will compile and run without any issues.

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  • 49. 

    Following code will result in: float a = 9/0

    • Compilation error: DivideByZeroException

    • Runtime Exception

    Correct Answer
    A. Runtime Exception
    Explanation
    The given code will result in a runtime exception because it attempts to divide the number 9 by 0. Division by zero is not defined in mathematics and is considered an error in programming. When this code is executed, it will throw a runtime exception specifically for dividing by zero, causing the program to terminate abruptly.

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  • Current Version
  • Mar 22, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Nov 21, 2014
    Quiz Created by
    Maheshjangid

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