MCQOPTIONS
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MCQOPTIONS
This section includes 44 Mcqs, each offering curated multiple-choice questions to sharpen your Java Programming knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
What is the output of the below Java program with packages? |
| A. | No output |
| B. | Compiler error |
| C. | 484 (some random number) |
| D. | None |
| Answer» D. None | |
| 2. |
What are the uses of a Java Package? |
| A. | A package contains ready-to-use classes written for a specific purpose. |
| B. | Packages are easy to distribute your code. It is nothing but reusability. Instead of writing code afresh, you can take advantage of the existing classes of a package. Simply import it and use. |
| C. | Packages help in maintaining the code easily. Each sub-package may be maintained for more specific purposes. You can reuse the class names in sub-packages or other packages without name clash. |
| D. | All the above |
| Answer» E. | |
| 3. |
Accessing the variables, constants, or methods of a class, imported from a package is subjective to access modifiers like PUBLIC, PRIVATE, PROTECTED and default. State TRUE or FALSE. |
| A. | TRUE |
| B. | FALSE |
| C. | - |
| D. | - |
| Answer» B. FALSE | |
| 4. |
Choose a correct statement about using the classes or interfaces or abstract classes inside the packages in our Java program. |
| A. | You can extend the class imported from the package. |
| B. | You can implement the interfaces imported from the package. |
| C. | You can extend the abstract classes imported from the package. |
| D. | All the above |
| Answer» E. | |
| 5. |
Which is the symbol used to separate a super-package and a sub-package at the time of declaring or importing in a Java program? |
| A. | Dollar ($) |
| B. | Pound (#) |
| C. | Period (.) or DOT |
| D. | Arrow (->) |
| Answer» D. Arrow (->) | |
| 6. |
Choose a correct way of importing all the classes in the below java program with packages. |
| A. | import animals.*; |
| B. | import animals.cat; |
| C. | Both A and B |
| D. | None |
| Answer» D. None | |
| 7. |
What are the popular Classes or Interfaces inside a Java Language Pack (java.lang)? |
| A. | Byte, Character, Short, Integer, Float, Long, Number |
| B. | Math, String, StringBuffer, StringBuilder |
| C. | Thread, Throwable, Exception, Error |
| D. | All the above |
| Answer» E. | |
| 8. |
Which is the default Java package that will be auto included (imported) in the classpath while Compiling and Running a Java program? |
| A. | java.io |
| B. | java.util |
| C. | java.net |
| D. | java.lang |
| Answer» E. | |
| 9. |
How does JAVAC or JAVA (JVM) find the packages that will be used inside classes by an import statement? |
| A. | If the packages are defined on the same root level as the compiling or running class file, Java knows it. |
| B. | You should manually use the CLASSPATH or CP command to include the path of the package or single-class for compiling and running |
| C. | You can copy the JAR files in LIB folder of Java inside Program Files |
| D. | All the above |
| Answer» E. | |
| 10. |
You can place a comment before the Package Declaration statement in Java. State TRUE or FALSE. |
| A. | TRUE |
| B. | FALSE |
| C. | - |
| D. | - |
| Answer» B. FALSE | |
| 11. |
The package declaration statement should be the first statement in a Java file. State TRUE or FALSE. |
| A. | TRUE |
| B. | FALSE |
| C. | - |
| D. | - |
| Answer» B. FALSE | |
| 12. |
When importing a Package, the Class is actually importing ____. |
| A. | Classes or Interfaces from the package |
| B. | Constants |
| C. | Methods |
| D. | None of the above |
| Answer» B. Constants | |
| 13. |
Choose a correct statement below about importing packages into a class. |
| A. | A Java class or interface can import any number of packages. |
| B. | It is advised to import only the required Classes of a package to save memory. |
| C. | Java packages are usually distributed in the form of JAR files. |
| D. | All the above |
| Answer» E. | |
| 14. |
What is the maximum number of levels or depth up to which sub-packages can be defined in Java? |
| A. | 8 |
| B. | 16 |
| C. | 32 |
| D. | There is no limit |
| Answer» E. | |
| 15. |
You can use the same name for a Parent package and Child package in Java. State TRUE or FALSE. |
| A. | TRUE |
| B. | FALSE |
| C. | - |
| D. | - |
| Answer» B. FALSE | |
| 16. |
Choose correct declaration and importing of packages in Java. |
| A. | package SOMEPACKAGE; |
| B. | import PACKAGE_N.*; |
| C. | import PACKAGE_M.*; |
| D. | All the above |
| Answer» B. import PACKAGE_N.*; | |
| 17. |
Which is the correct syntax to import a Java package below? |
| A. | import PACKAGE1.*; |
| B. | import PACKAGE1.CLASS1; |
| C. | import PACKAGE1.PACKAGE2.PACKAGE3.*; |
| D. | All the above |
| Answer» E. | |
| 18. |
The keyword used to import a package into Java class or Interface is ___. |
| A. | import |
| B. | download |
| C. | use |
| D. | None of the above |
| Answer» B. download | |
| 19. |
It is possible to declare a package and import another package within the same Java class file. State TRUE or FALSE. |
| A. | TRUE |
| B. | FALSE |
| C. | - |
| D. | - |
| Answer» B. FALSE | |
| 20. |
The name of a package is the name of the ___ in Java. |
| A. | folder |
| B. | All parent folders separated by DOT symbols |
| C. | All parent packages separated by DOT symbols |
| D. | All the above |
| Answer» E. | |
| 21. |
Can you compile a Java file kept inside a directory without mentioning the package name? |
| A. | Yes |
| B. | No |
| C. | - |
| D. | - |
| Answer» B. No | |
| 22. |
What is the maximum number of Java Class files that can be kept inside a single Java Package? |
| A. | 8 |
| B. | 64 |
| C. | 128 |
| D. | Unlimited |
| Answer» E. | |
| 23. |
The keyword used to declare a Java package is ____. |
| A. | pkg |
| B. | package |
| C. | pkge |
| D. | None of the above |
| Answer» C. pkge | |
| 24. |
Choose the correct syntax of a Java Package below. |
| A. | package PACKAGE_NAME; |
| B. | package PACKAGE_NAME.*; |
| C. | pkg PACKAGE_NAME; |
| D. | pkg PACKAGE_NAME.*; |
| Answer» B. package PACKAGE_NAME.*; | |
| 25. |
What is a package in Java? |
| A. | A Package is a collection of files of type Java Class, Interfaces, or Abstract Class |
| B. | A Package is simply a Directory or Folder with Java Classes |
| C. | A Package usually contains Java Classes written for a specific purpose or problem |
| D. | All the above |
| Answer» E. | |
| 26. |
What is the length of the application box made by this program? |
| A. | 20 |
| B. | Default value |
| C. | Compilation Error |
| D. | Runtime Error |
| Answer» D. Runtime Error | |
| 27. |
Which of the following packages is used to includes classes to create user interface like Button and Checkbox? |
| A. | java.lang |
| B. | java.net |
| C. | java.awt |
| D. | java.io |
| Answer» D. java.io | |
| 28. |
Can "abstract" keyword be used with constructor, Initialization Block, Instance Initialization and Static Initialization Block. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't Say |
| Answer» C. May be True or False | |
| 29. |
Package in Java is a mechanism to encapsulate a ______________. |
| A. | Classes |
| B. | Sub Packages |
| C. | Interfaces |
| D. | All of the above |
| Answer» E. | |
| 30. |
Which of the following is false statement about package in java? |
| A. | Packages are used for preventing naming conflicts |
| B. | Providing controlled access: protected and default have package level access control. |
| C. | Packages cannot be considered as data encapsulation |
| D. | both a and c |
| Answer» D. both a and c | |
| 31. |
A java interface can contain _______. |
| A. | Abstract methods(unimplemented) and implemented methods both |
| B. | public Abstract methods |
| C. | public static Final Variables only |
| D. | public static Final Variables and abstract methods both |
| Answer» E. | |
| 32. |
Which of the following packages is used to includes utility classes like Calendar, Collection, Date? |
| A. | java.lang |
| B. | java.net |
| C. | java.awt |
| D. | java.util |
| Answer» E. | |
| 33. |
Which of the following is the correct way of importing an entire package "pkg"? |
| A. | import pkg. |
| B. | Import pkg. |
| C. | import pkg.* |
| D. | Import pkg.* |
| Answer» D. Import pkg.* | |
| 34. |
Which of the following is true about methods in an interface in java? |
| A. | An interface can contain only abstract method. |
| B. | We can define a method in an interface |
| C. | Private and protected access modifiers can also be used to declare methods in interface |
| D. | None of the above |
| Answer» B. We can define a method in an interface | |
| 35. |
Packages that are inside another package are the _________ |
| A. | packages |
| B. | nested packages |
| C. | util subpackages |
| D. | subpackages |
| Answer» E. | |
| 36. |
Package names and directory structure are closely related. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't Say |
| Answer» B. False | |
| 37. |
Which of the following classes directly implement Set interface? |
| A. | Vector |
| B. | HashSet |
| C. | HashTable |
| D. | LinkedList |
| Answer» C. HashTable | |
| 38. |
Which is the correct way to inherit and implement the interface? |
| A. | class Cat implements IAnimal{} |
| B. | class Cat import IAnimal{} |
| C. | class Cat extends IAnimal{} |
| D. | None is correct |
| Answer» B. class Cat import IAnimal{} | |
| 39. |
An _______________ statement can be used to access the classes and interface of a different package from the current package. |
| A. | instanceOf |
| B. | import |
| C. | extends |
| D. | implement |
| Answer» C. extends | |
| 40. |
Can “abstract” keyword be used with constructor, Initialization Block, Instance Initialization and Static Initialization Block. |
| A. | True |
| B. | False |
| C. | May be |
| D. | Can't say |
| Answer» C. May be | |
| 41. |
Which of the following is an incorrect statement regarding the use of generics and parameterized types in Java? |
| A. | Generics provide type safety by shifting more type checking responsibilities to the compiler |
| B. | Generics and parameterized types eliminate the need for down casts when using Java Collections |
| C. | When designing your own collections class (say, a linked list), generics and parameterized types allow you to achieve type safety with just a single class definition as opposed to defining multiple classes |
| D. | All of the mentioned |
| Answer» D. All of the mentioned | |
| 42. |
What is the output of this program?Note : packages.class file is in directory pkg; |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 0 1 2 |
| Answer» D. 0 1 2 | |
| 43. |
Which of the following is the correct way of importing an entire package ‘pkg’? |
| A. | import pkg. |
| B. | Import pkg. |
| C. | import pkg.* |
| D. | Import pkg.* |
| Answer» D. Import pkg.* | |
| 44. |
What is the output of this program?Note : Output.class file is not in directory pkg. |
| A. | HelloGoodWorld |
| B. | HellGoodoWorld |
| C. | Compilation error |
| D. | Runtime error |
| Answer» E. | |