{"id":10057,"date":"2023-04-29T11:43:54","date_gmt":"2023-04-29T11:43:54","guid":{"rendered":"https:\/\/www.scmgalaxy.com\/tutorials\/?p=10057"},"modified":"2023-06-19T13:30:24","modified_gmt":"2023-06-19T13:30:24","slug":"top-50-java-interview-questions-with-answers","status":"publish","type":"post","link":"https:\/\/www.scmgalaxy.com\/tutorials\/top-50-java-interview-questions-with-answers\/","title":{"rendered":"Top 50 Java Interview Questions with Answers"},"content":{"rendered":"
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Java Interview Questions with Answers<\/em><\/strong><\/figcaption><\/figure>\n<\/div>\n\n\n

1. What is the output of the following code?<\/h3>\n\n\n
\nint x = 5;\nSystem.out.println(++x);\n<\/pre><\/div>\n\n\n
a) 5
b) 6
c) Compilation error
d) Runtime error<\/p>\n\n\n\n
Answer: b) 6<\/h4>\n\n\n\n
2. Which keyword is used to prevent a member variable from being serialized?<\/h3>\n\n\n\n
a) transient
b) static
c) final
d) volatile<\/p>\n\n\n\n
Answer: a) transient<\/h4>\n\n\n\n
3. What is the output of the following code?<\/h3>\n\n\n
\nString str1 = "hello";\nString str2 = "hello";\nSystem.out.println(str1 == str2);\n<\/pre><\/div>\n\n\n
a) true
b) false
c) Compilation error
d) Runtime error<\/p>\n\n\n\n
Answer: a) true<\/h4>\n\n\n\n
4. What is an abstract class?<\/h3>\n\n\n\n

a) A class that cannot be instantiated
b) A class that can only be instantiated
c) A class that is final
d) A class with no constructor<\/p>\n\n\n\n
Answer: a) A class that cannot be instantiated<\/h4>\n\n\n\n
5. What is polymorphism?<\/h3>\n\n\n\n
a) The ability of an object to take on many forms
b) The ability of a method to be defined in multiple classes
c) The ability of a variable to be of multiple types
d) The ability of a class to be inherited by multiple classes<\/p>\n\n\n\n
Answer: a) The ability of an object to take on many forms<\/h4>\n\n\n\n
6. Which keyword is used to create a new instance of a class?<\/h3>\n\n\n\n
a) new
b) this
c) super
d) instance<\/p>\n\n\n\n
Answer: a) new<\/h4>\n\n\n\n
7. What is the output of the following code?<\/h3>\n\n\n
\nint[] nums = {1, 2, 3};\nfor (int i = 0; i &lt; nums.length; i++) {\nSystem.out.println(nums[i]);\n}\n<\/pre><\/div>\n\n\n
a) 1 2 3
b) 1
2
3
c) Compilation error
d) Runtime error<\/p>\n\n\n\n
Answer: b) 1 2 3<\/h4>\n\n\n\n
8. Which of the following is not a primitive data type in Java?<\/h3>\n\n\n\n
a) int
b) float
c) char
d) String<\/p>\n\n\n\n
Answer: d) String<\/h4>\n\n\n\n
9. What is inheritance?<\/h3>\n\n\n\n
a) The ability of a class to implement an interface
b) The ability of a class to contain an object of another class
c) The ability of a class to be derived from another class
d) The ability of a class to have multiple constructors<\/p>\n\n\n\n
Answer: c) The ability of a class to be derived from another class<\/h4>\n\n\n\n
10. What is the output of the following code?<\/h3>\n\n\n
\nString str = "hello";\nSystem.out.println(str.substring(1, 4));\n<\/pre><\/div>\n\n\n
a) h
b) el
c) ell
d) llo<\/p>\n\n\n\n
Answer: c) ell<\/h4>\n\n\n\n
11. Which keyword is used to exit a for loop?<\/h3>\n\n\n\n
a) exit
b) break
c) continue
d) return<\/p>\n\n\n\n
Answer: b) break<\/h4>\n\n\n\n
12. What is the output of the following code?<\/h3>\n\n\n
\nString str = "hello";\nfor (int i = str.length() - 1; i &gt;= 0; i--) {\nSystem.out.print(str.charAt(i));\n}\n<\/pre><\/div>\n\n\n
a) hello
b) olleh
c) hlo
d) Compilation error<\/p>\n\n\n\n
Answer: b) olleh<\/h4>\n\n\n\n
13. Which keyword is used to create an interface?<\/h3>\n\n\n\n
a) interface
b) extends
c) implements
d) abstract<\/p>\n\n\n\n
Answer: a) interface<\/h4>\n\n\n\n
14. What is encapsulation?<\/h3>\n\n\n\n
a) The ability of a class to be extended by another class
b) The ability of a class to implement an interface
c) The ability of a class to contain an object of another class
d) The ability of a class to hide its implementation details<\/p>\n\n\n\n
Answer: d) The ability of a class to hide its implementation details<\/h4>\n\n\n\n
15. What is the output of the following code?<\/h3>\n\n\n
\nint x = 6;\nif (x &lt; 5) {\nSystem.out.println("Less than 5");\n} else if (x &lt; 10) {\nSystem.out.println("Between 5 and 10");\n} else {\nSystem.out.println("Greater than or equal to 10");\n}\n<\/pre><\/div>\n\n\n
a) Less than 5
b) Between 5 and 10
c) Greater than or equal to 10
d) Compilation error<\/p>\n\n\n\n
Answer: b) Between 5 and 10<\/h4>\n\n\n\n
16. Which keyword is used to access a static method or variable?<\/h3>\n\n\n\n
a) static
b) private
c) public
d) this<\/p>\n\n\n\n
Answer: a) static<\/h4>\n\n\n\n
17. What is a constructor?<\/h3>\n\n\n\n
a) A method used to create an object
b) A method used to destroy an object
c) A method used to access an object’s properties
d) A method used to declare an object’s class<\/p>\n\n\n\n
Answer: a) A method used to create an object<\/h4>\n\n\n\n
18. What is the output of the following code?<\/h3>\n\n\n
\nint x = 2;\nswitch(x) {\ncase 1:\nSystem.out.println("One");\nbreak;\ncase 2:\nSystem.out.println("Two");\nbreak;\ndefault:\nSystem.out.println("Default");\nbreak;\n}\n<\/pre><\/div>\n\n\n
a) One
b) Two
c) Default
d) Compilation error<\/p>\n\n\n\n
Answer: b) Two<\/h4>\n\n\n\n
19. Which keyword is used to access a parent class’s method or variable?<\/h3>\n\n\n\n
a) extends
b) super
c) this
d) implements<\/p>\n\n\n\n
Answer: b) super<\/h4>\n\n\n\n
20. What is the output of the following code?<\/h3>\n\n\n
\nint x = 2;\nwhile (x &lt; 5) {\nSystem.out.println(x);\nx++;\n}\n<\/pre><\/div>\n\n\n
a) 2 3 4
b) 2 3 4 5
c) 3 4
d) 3 4 5<\/p>\n\n\n\n
Answer: a) 2 3 4<\/h4>\n\n\n\n
21. Which keyword is used to declare an abstract method?<\/h3>\n\n\n\n
a) abstract
b) final
c) static
d) private<\/p>\n\n\n\n
Answer: a) abstract<\/h4>\n\n\n\n
22. What is the output of the following code?<\/h3>\n\n\n
\nString str = "hello";\nSystem.out.println(str.indexOf("l"));\n<\/pre><\/div>\n\n\n
a) 2
b) 3
c) 4
d) -1<\/p>\n\n\n\n
Answer: b) 3<\/h4>\n\n\n\n
23. Which keyword is used to create a constant variable?<\/h3>\n\n\n\n
a) final
b) static
c) volatile
d) transient<\/p>\n\n\n\n
Answer: a) final<\/h4>\n\n\n\n
24. What is the output of the following code?<\/h3>\n\n\n
\nint x = 5;\nif (x &gt; 3 &amp;&amp; x &lt; 7) {\nSystem.out.println("In range");\n} else {\nSystem.out.println("Out of range");\n}\n<\/pre><\/div>\n\n\n
a) In range
b) Out of range
c) Compilation error
d) Runtime error<\/p>\n\n\n\n
Answer: a) In range<\/h4>\n\n\n\n
25. What is a static method?<\/h3>\n\n\n\n
a) A method that can be accessed without creating an object of the class
b) A method that can only be accessed by objects of the class
c) A method that is final
d) A method that is abstract<\/p>\n\n\n\n
Answer: a) A method that can be accessed without creating an object of the class<\/h4>\n\n\n\n
26. What is the output of the following code?<\/h3>\n\n\n
\nint x = 10;\ndo {\nSystem.out.println(x);\nx--;\n} while (x &gt; 5);\n<\/pre><\/div>\n\n\n
a) 10 9 8 7 6 5
b) 10 9 8 7 6
c) 9 8 7 6
d) Compilation error<\/p>\n\n\n\n
Answer: b) 10 9 8 7 6<\/h4>\n\n\n\n
27. Which keyword is used to declare a synchronized method?<\/h3>\n\n\n\n
a) synchronized
b) static
c) final
d) volatile<\/p>\n\n\n\n
Answer: a) synchronized<\/h4>\n\n\n\n
28. What is the output of the following code?<\/h3>\n\n\n
\nint x = 2;\nSystem.out.println(x++);\n<\/pre><\/div>\n\n\n
a) 2
b) 3
c) Compilation error
d) Runtime error<\/p>\n\n\n\n
Answer: a) 2<\/h4>\n\n\n\n
29. What is the difference between an interface and an abstract class?<\/h3>\n\n\n\n
a) An interface cannot have any method implementations, while an abstract class can have some method implementations
b) An abstract class cannot have any method implementations, while an interface can have some method implementations
c) An abstract class can be instantiated, while an interface cannot be instantiated
d) An interface cannot be extended, while an abstract class can be extended<\/p>\n\n\n\n
Answer: a) An interface cannot have any method implementations, while an abstract class can have some method implementations<\/h4>\n\n\n\n
30. What is a package in Java?<\/h3>\n\n\n\n
a) A container for classes and other packages
b) A keyword that tells the compiler to import a class
c) A keyword that indicates the start of a block of code
d) A keyword that indicates the end of a block of code<\/p>\n\n\n\n
Answer: a) A container for classes and other packages<\/h4>\n\n\n\n
31. What is the output of the following code?<\/h3>\n\n\n
\nint x = 2;\nint y = x == 2 ? 5 : 7;\nSystem.out.println(y);\n<\/pre><\/div>\n\n\n
a) 5
b) 7
c) Compilation error
d) Runtime error<\/p>\n\n\n\n
Answer: a) 5<\/h4>\n\n\n\n
32. Which keyword is used to specify a variable as a reference to an object?<\/h3>\n\n\n\n
a) obj
b) ref
c) this
d) none of the above<\/p>\n\n\n\n
Answer: d) none of the above<\/h4>\n\n\n\n
33. What is the output of the following code?<\/h3>\n\n\n
\nString str = "hello";\nSystem.out.println(str.toUpperCase());\n<\/pre><\/div>\n\n\n
a) hello
b) HELLO
c) Compilation error
d) Runtime error<\/p>\n\n\n\n
Answer: b) HELLO<\/h4>\n\n\n\n
34. Which keyword is used to declare a variable that cannot be changed?<\/h3>\n\n\n\n
a) final
b) static
c) volatile
d) transient<\/p>\n\n\n\n
Answer: a) final<\/h4>\n\n\n\n
35. What is a thread?<\/h3>\n\n\n\n
a) A container for code and data
b) A unit of execution within a process
c) A keyword that indicates the start of a block of code
d) A keyword that indicates the end of a block of code<\/p>\n\n\n\n
Answer: b) A unit of execution within a process<\/h4>\n\n\n\n
36. What is the output of the following code?<\/h3>\n\n\n
\nfor (int i = 0; i &lt; 5; i) {\nSystem.out.println(i);\n}\n<\/pre><\/div>\n\n\n
a) Compilation error
b) 0 1 2 3 4
c) Infinite loop
d) Runtime error<\/p>\n\n\n\n
Answer: c) Infinite loop<\/h4>\n\n\n\n
37. Which keyword is used to declare a method that cannot be overridden?<\/h3>\n\n\n\n
a) final
b) static
c) synchronized
d) abstract<\/p>\n\n\n\n
Answer: a) final<\/h4>\n\n\n\n
38. What is the output of the following code?<\/h3>\n\n\n
\nint x = 1;\nint y = 2;\nSystem.out.println(x + y);\n<\/pre><\/div>\n\n\n
a) 1
b) 2
c) 3
d) Compilation error<\/p>\n\n\n\n
Answer: c) 3<\/h4>\n\n\n\n
39. Which keyword is used to import a class into a Java program?<\/h3>\n\n\n\n
a) import
b) package
c) class
d) none of the above<\/p>\n\n\n\n
Answer: a) import<\/h4>\n\n\n\n
40. What is the output of the following code?<\/h3>\n\n\n
\nint x = 1;\nint y = 2;\nSystem.out.println(x &gt; y ? x : y);\n<\/pre><\/div>\n\n\n
a) 1
b) 2
c) Compilation error
d) Runtime error<\/p>\n\n\n\n
Answer: b) 2<\/h4>\n\n\n\n
41. Which keyword is used to declare an inner class?<\/h3>\n\n\n\n
a) class
b) private
c) protected
d) none of the above<\/p>\n\n\n\n
Answer: d) none of the above (an inner class is declared within another class)<\/h4>\n\n\n\n
42. What is the output of the following code?<\/h3>\n\n\n
\nString str = "hello";\nSystem.out.println(str.length());\n<\/pre><\/div>\n\n\n
a) 5
b) 6
c) Compilation error
d) Runtime error<\/p>\n\n\n\n
Answer: a) 5<\/h4>\n\n\n\n
43. Which keyword is used to create a new instance of an array?<\/h3>\n\n\n\n
a) new
b) this
c) super
d) instance<\/p>\n\n\n\n
Answer: a) new<\/h4>\n\n\n\n
44. What is the output of the following code?<\/h3>\n\n\n
\nint x = 5;\nif (x == 5) {\nint y = 2;\nSystem.out.println(y);\n}\n<\/pre><\/div>\n\n\n
a) 2
b) Compilation error
c) Runtime error
d) No output<\/p>\n\n\n\n
Answer: a) 2<\/h4>\n\n\n\n
45. What is the output of the following code?<\/h3>\n\n\n
\nString str1 = "hello";\nString str2 = "world";\nSystem.out.println(str1 + " " + str2);\n<\/pre><\/div>\n\n\n
a) helloworld
b) hello world
c) Compilation error
d) Runtime error<\/p>\n\n\n\n
Answer: b) hello world<\/h4>\n\n\n\n
46. Which keyword is used to declare a variable that can be accessed by any object of the class?<\/h3>\n\n\n\n
a) private
b) protected
c) public
d) none of the above<\/p>\n\n\n\n
Answer: c) public<\/h4>\n\n\n\n
47. What is the output of the following code?<\/h3>\n\n\n
\nint[] nums = {1, 2, 3};\nSystem.out.println(nums[1]);\n<\/pre><\/div>\n\n\n
a) 1
b) 2
c) 3
d) Compilation error<\/p>\n\n\n\n
Answer: b) 2<\/h4>\n\n\n\n
48. Which keyword is used to declare that a method can throw an exception?<\/h3>\n\n\n\n
a) try
b) catch
c) throw
d) throws<\/p>\n\n\n\n
Answer: d) throws<\/h4>\n\n\n\n
49. What is the output of the following code?<\/h3>\n\n\n
\nint x = 2;\nSystem.out.println(x--);\n<\/pre><\/div>\n\n\n
a) 2
b) 1
c) Compilation error
d) Runtime error<\/p>\n\n\n\n
Answer: a) 2<\/h4>\n\n\n\n
50. What is the difference between a while loop and a do-while loop?<\/h3>\n\n\n\n
a) A while loop checks the condition before executing the loop body, while a do-while loop checks the condition after executing the loop body
b) A do-while loop checks the condition before executing the loop body, while a while loop checks the condition after executing the loop body
c) A while loop can only be executed once, while a do-while loop can be executed multiple times
d) There is no difference between a while loop and a do-while loop<\/p>\n\n\n\n
Answer: a) A while loop checks the condition before executing the loop body, while a do-while loop checks the condition after executing the loop body<\/h4>\n","protected":false},"excerpt":{"rendered":"
1. What is the output of the following code? a) 5b) 6c) Compilation errord) Runtime error Answer: b) 6 2. 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