{"id":1198,"date":"2017-08-31T10:30:20","date_gmt":"2017-08-31T10:30:20","guid":{"rendered":"https:\/\/www.h2kinfosys.com\/blog\/?p=1198"},"modified":"2025-10-22T07:06:31","modified_gmt":"2025-10-22T11:06:31","slug":"java-online-test","status":"publish","type":"post","link":"https:\/\/www.h2kinfosys.com\/blog\/java-online-test\/","title":{"rendered":"JAVA Online Test"},"content":{"rendered":"\n\n\n

1. Which of the following is not a Java keyword?<\/strong><\/h3>\n\n\n\n

A. static
B. Boolean
C. void
D. private<\/p>\n\n\n\n

\u2705 Answer:<\/strong> B. Boolean<\/p>\n\n\n\n

2. What is the default value of a local variable in Java?<\/strong><\/h3>\n\n\n\n

A. 0
B. null
C. false
D. No default value<\/p>\n\n\n\n

\u2705 Answer:<\/strong> D. No default value<\/p>\n\n\n\n

3. Which concept of OOP is achieved by method overloading?<\/strong><\/h3>\n\n\n\n

A. Encapsulation
B. Polymorphism
C. Abstraction
D. Inheritance<\/p>\n\n\n\n

\u2705 Answer:<\/strong> B. Polymorphism<\/p>\n\n\n\n

4. What is the size of an int<\/code> in Java?<\/strong><\/h3>\n\n\n\n

A. 2 bytes
B. 4 bytes
C. 8 bytes
D. Depends on OS<\/p>\n\n\n\n

\u2705 Answer:<\/strong> B. 4 bytes<\/p>\n\n\n\n

5. Which of these cannot be used for a variable name in Java?<\/strong><\/h3>\n\n\n\n

A. myVariable
B. $value
C. _count
D. 123abc<\/p>\n\n\n\n

\u2705 Answer:<\/strong> D. 123abc<\/p>\n\n\n\n

6. Which method is the entry point of a Java program?<\/strong><\/h3>\n\n\n\n

A. start()
B. run()
C. main()
D. init()<\/p>\n\n\n\n

\u2705 Answer:<\/strong> C. main()<\/p>\n\n\n\n

7. What will System.out.println(10 + 20 + \"Java\");<\/code> output?<\/strong><\/h3>\n\n\n\n

A. Java30
B. 30Java
C. 1020Java
D. Compilation error<\/p>\n\n\n\n

\u2705 Answer:<\/strong> B. 30Java<\/p>\n\n\n\n

8. Which of the following is not a valid access modifier?<\/strong><\/h3>\n\n\n\n

A. private
B. protected
C. internal
D. public<\/p>\n\n\n\n

\u2705 Answer:<\/strong> C. internal<\/p>\n\n\n\n

9. Which keyword is used to inherit a class in Java?<\/strong><\/h3>\n\n\n\n

A. implements
B. extends
C. inherits
D. instanceOf<\/p>\n\n\n\n

\u2705 Answer:<\/strong> B. extends<\/p>\n\n\n\n

10. What does the final<\/code> keyword mean when applied to a variable?<\/strong><\/h3>\n\n\n\n

A. It cannot be overridden
B. It cannot be reassigned
C. It cannot be accessed
D. It is public<\/p>\n\n\n\n

\u2705 Answer:<\/strong> B. It cannot be reassigned<\/p>\n\n\n\n

11. Which of these statements about constructors is true?<\/strong><\/h3>\n\n\n\n

A. Constructors can have a return type
B. Constructors are inherited
C. Constructors initialize objects
D. Constructors can be abstract<\/p>\n\n\n\n

\u2705 Answer:<\/strong> C. Constructors initialize objects<\/p>\n\n\n\n

12. Which class is the parent of all classes in Java?<\/strong><\/h3>\n\n\n\n

A. System
B. Object
C. Runtime
D. Class<\/p>\n\n\n\n

\u2705 Answer:<\/strong> B. Object<\/p>\n\n\n\n

13. What is method overriding?<\/strong><\/h3>\n\n\n\n

A. Two methods with the same name in one class
B. Subclass providing a new implementation of a superclass method
C. Two methods differing only by parameters
D. Method hiding<\/p>\n\n\n\n

\u2705 Answer:<\/strong> B. Subclass providing a new implementation of a superclass method<\/p>\n\n\n\n

14. Can a constructor be static<\/code>?<\/strong><\/h3>\n\n\n\n

A. Yes
B. No
C. Only in abstract classes
D. Only for inner classes<\/p>\n\n\n\n

\u2705 Answer:<\/strong> B. No<\/p>\n\n\n\n

15. Which package is imported by default?<\/strong><\/h3>\n\n\n\n

A. java.util
B. java.lang
C. java.io
D. java.net<\/p>\n\n\n\n

\u2705 Answer:<\/strong> B. java.lang<\/p>\n\n\n\n

16. Which of these data types can store Unicode characters?<\/strong><\/h3>\n\n\n\n

A. int
B. float
C. char
D. String<\/p>\n\n\n\n

\u2705 Answer:<\/strong> C. char<\/p>\n\n\n\n

17. What does this<\/code> keyword refer to?<\/strong><\/h3>\n\n\n\n

A. Parent class object
B. Current object
C. Static object
D. Class name<\/p>\n\n\n\n

\u2705 Answer:<\/strong> B. Current object<\/p>\n\n\n\n

18. Which of the following cannot be declared abstract<\/code>?<\/strong><\/h3>\n\n\n\n

A. Class
B. Method
C. Variable
D. Interface<\/p>\n\n\n\n

\u2705 Answer:<\/strong> C. Variable<\/p>\n\n\n\n

19. Which of the following is not an OOP principle?<\/strong><\/h3>\n\n\n\n

A. Inheritance
B. Compilation
C. Polymorphism
D. Abstraction<\/p>\n\n\n\n

\u2705 Answer:<\/strong> B. Compilation<\/p>\n\n\n\n

20. Which of these operators is used for string comparison?<\/strong><\/h3>\n\n\n\n

A. ==
B. equals()
C. compareTo()
D. Both B and C<\/p>\n\n\n\n

\u2705 Answer:<\/strong> D. Both B and C<\/p>\n","protected":false},"excerpt":{"rendered":"

1. Which of the following is not a Java keyword? A. staticB. BooleanC. voidD. private \u2705 Answer: B. Boolean 2. What is the default value of a local variable in Java? A. 0B. nullC. falseD. No default value \u2705 Answer: D. No default value 3. Which concept of OOP is achieved by method overloading? A. […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[57],"tags":[58,60,59,61],"class_list":["post-1198","post","type-post","status-publish","format-standard","hentry","category-java-skill-test","tag-java","tag-java-online-quiz","tag-java-quiz","tag-java-skill-test"],"_links":{"self":[{"href":"https:\/\/www.h2kinfosys.com\/blog\/wp-json\/wp\/v2\/posts\/1198","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.h2kinfosys.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.h2kinfosys.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.h2kinfosys.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.h2kinfosys.com\/blog\/wp-json\/wp\/v2\/comments?post=1198"}],"version-history":[{"count":2,"href":"https:\/\/www.h2kinfosys.com\/blog\/wp-json\/wp\/v2\/posts\/1198\/revisions"}],"predecessor-version":[{"id":31119,"href":"https:\/\/www.h2kinfosys.com\/blog\/wp-json\/wp\/v2\/posts\/1198\/revisions\/31119"}],"wp:attachment":[{"href":"https:\/\/www.h2kinfosys.com\/blog\/wp-json\/wp\/v2\/media?parent=1198"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.h2kinfosys.com\/blog\/wp-json\/wp\/v2\/categories?post=1198"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.h2kinfosys.com\/blog\/wp-json\/wp\/v2\/tags?post=1198"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}