Top 101 Core Java Interview Questions and Answers for Experienced with examples

Top 101 Core Java Interview Questions and Answers for Experienced with Examples 

In this post "Top 101 Core Java Interview Questions and Answers for Experienced with examples",we will list core java interview questions. We will update this post "Top 101 Core Java Interview Questions and Answers for Experienced with examples" from time to time. Viewers are also welcome for suggesting any questions related to this post.

Top 101 Core Java Interview Questions and Answers for Experienced with examples

1. What is Java technology ?


2. What are the benefits of OOPS?


3. What is Java Development Kit (JDK) ?


4. What are the Major Features of Java Technology Architecture ?


5. What is Java Virtual Machine (JVM) ?


6. What are the advantages of JVM?


7. What are classpath variables?


8. What was the earlier name of Java?


9. What are the steps involved in Java Application Execution ?


10. Explain the architecture of code execution process inside JRE ?


11. What is Garbage Collector ?


12. What an object contains?


13. What is class loader ?


14. Why Java is known as interpreted and compiled?


15. Which feature of C language is not present in Java?


16. What is Collection API?


17. What is byte code verifier ?


18. Explain different way of using thread?


19. Why Java is known as a platform neutral language?


20. What is Java API?


21. What is the difference between static and non-static variables?


22. Can main() method be declared final?


23. What is the purpose of garbage collection in Java, and when is it used?


24. What are the features of OOPS?


25. What is encapsulation?


26. Define Applet in JAVA


27. What are the verification done by byte code verifier ?


28. What is JDBC in JAVA


29. What is inheritance?


30. Explain the usage of Java packages.


31. How you can force the garbage collection?


32. What is abstraction?


33. What is single inheritance?


34. What is a Constructor ?


35. How do we access data members of a class in java?


36. What are the uses of Java packages?


37. What is the significance of import keyword?


38. What is user defined package in Java?


39. How to place compiled Java file in a different location ?


40. What is access modifier and what are its types?


41. What is static keyword?


42. What is a transient variable?


43. What is native keyword?


44. What is an abstract class?


45. How to define an Abstract class?


46. What is object class in java?


47. What are the limitations of array?


48. What is set interface about?


49. What is Enumeration interface?


50. Explain different way of using thread?


51. Explain in your own words the "bottom line" benefits of the use of an interface.


52. Compare Array List vs Linked List


53. What is the difference between private, protected, and public?


54. What is method overriding in JAVA?


55. Do interfaces have member variables?


56. How will you establish the connection between the servlet and an applet?


57. What are the threads will start, when you start the java program?


58. Does the JDBC-ODBC Bridge support multiple concurrent open statements per connection?


59. What is the difference between lightweight and heavyweight component?


60. What interface do you implement to do the sorting?


61. What are the benefits of using threads in an application?


62. What are some advantages and disadvantages of Java Sockets?


63. What are the differences between process and threads?


64. What is single threaded and multi threaded process?


65. What do you mean by Final class in Java


66. Name the containers which uses Border Layout as their default layout?


67. What are wrapper classes in JAVA?


68. What is the difference between an Interface and an Abstract class?


69. How to use threads in java?


70. Explain the usage of the keyword transient?


71. What is static in java?


72. What if I do not provide the String array as the argument to the method?


73. What do you mean by Run time Exceptions in Java?


74. Describe thread policy in Java?


75. What do you mean by a Classloader?


76. What are the ways in which you can instantiate a thread?


77. What are the states of a thread?


78. What is the super class of Hashtable?


79. What is a socket?


80. What are the different types of qualifier and what is the default qualifier?


81. What do you mean by RMI and how it is useful?


82. Name any two Java IDE’s?


83. How are this() and super() used with constructors?


84. What is the use of preparedstatement?


85. What are the different driver types available in JDBC?


86. What is a Marker Interface?


87. Is JDBC-ODBC bridge multi-threaded?


88. What is a lightweight component?


89. What is a heavyweight component?


90. How does the Java default constructor be provided?


91. What if the static modifier is removed from the signature of the main() method?


92. What is thread scheduling and what does it determines?


93. When you declare a method as abstract, can other nonabstract methods access it?


94. Is JDBC-ODBC bridge multi-threaded? -


95. What are the implicit packages that need not get imported into a class file?


96. What is the use of serializable?


97. What are the different level lockings using the synchronization keyword?


98. What is callable statement?


99. Can a abstract method have the static qualifier?


100. What is the eligibility for a object to get cloned?


101. What is the difference between a constructor and a method?

Wrapping it up

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