Most Asked Java Interview (100 Q&A) PDF

Java Interview Questions and Answers

Java is a widely used programming language that has been around for over two decades. It is used in many industries, including finance, healthcare, and gaming, among others.

If you’re looking to land a job as a Java developer, you’ll need to be well-prepared for the interview process.

To help you prepare, we have compiled a list of the most commonly asked Java interview questions and answers. This PDF contains 100 Q&A that cover topics such as Java basics, object-oriented programming, collections, multithreading, exception handling, and more.

Java Interview Questions PDF

By studying these questions and answers, you’ll be well-equipped to tackle any Java interview with confidence. So, let’s dive in and start preparing for your next Java interview!

The Contents

1. What is Java?
2. What is the difference between Java and JavaScript?
3. What is the main principle of Java programming?
4. What are the main features of Java?
5. What is a class in Java?
6. What is an object in Java?
7. What is a method in Java?
8. What is the difference between a class and an object?
9. What is inheritance in Java?
10. What are the types of inheritance in Java?

11. What is polymorphism in Java?
12. What are the access modifiers in Java?
13. What is encapsulation in Java?
14. What is a constructor in Java?
15. What is the difference between a constructor and a method?
16. What is the Java Virtual Machine (JVM)?
17. What is the Java Development Kit (JDK)?
18. What is the difference between the JDK and the JRE?
19. What is a package in Java?
20. What is the difference between an abstract class and an interface?
21. What is a static method in Java?
22. What is the keyword “final” used for in Java?
23. What is method overloading in Java?
24. What is method overriding in Java?
25. What is the difference between method overloading and method overriding?
26. What is the “this” keyword in Java?
27. What is a static variable in Java?
28. What is the purpose of the “final” keyword in method parameters?
29. What is the purpose of the “static” keyword in Java?
30. What is the difference between “==” and “.equals()” in Java?

31. What is the purpose of the “super” keyword in Java?
32. What is a thread in Java?
33. How do you create and start a thread in Java?
34. What is synchronization in Java?
35. What is the difference between the “synchronized” block and the “synchronized” method?
36. What is the purpose of the “volatile” keyword in Java?
37. What is an exception in Java?
38. What is the difference between checked and unchecked exceptions?
39. How do you handle exceptions in Java?
40. What is the purpose of the “finally” block in exception handling?
41. What is the difference between the “throw” and “throws” keywords in Java?
42. What is the difference between checked exceptions and runtime exceptions?
43. What is the Java API?
44. What is the difference between an ArrayList and a LinkedList?
45. What is the difference between a HashSet and a TreeSet?
46. What is the difference between the “equals()” method and the “hashCode()” method?
47. What is the difference between a shallow copy and a deep copy?
48. What is a lambda expression in Java?
49. What is functional programming in Java?
50. What are the Java 8 features for functional programming?
51. What is the difference between an interface and an abstract class?
52. What is the purpose of the “default” keyword in interface methods?
53. What is the difference between a BufferedReader and a Scanner?
54. What is the purpose of the “StringBuilder” class in Java?
55. What is the difference between the “Comparable” and “Comparator” interfaces?
56. What is the purpose of the “assert” keyword in Java?
57. What is the difference between a local variable and an instance variable?
58. What is the purpose of the “transient” keyword in Java?
59. What is the purpose of the “static” block in Java?
60. What is the purpose of the “strictfp” keyword in Java?

71. What is the difference between a public class and a default (package-private) class?
72. What is the purpose of the “enum” keyword in Java?
73. What is the purpose of the “break” and “continue” statements in Java?
74. What is the purpose of the “try-with-resources” statement in Java?
75. What is the purpose of the “instanceof” operator in Java?
76. What is the difference between the pre-increment and post-increment operators?
77. What is the difference between the pre-decrement and post-decrement operators?
78. What is the purpose of the “Math” class in Java?
79. What is the purpose of the “StringBuffer” class in Java?
80. What is the purpose of the “Math.random()” method in Java?
81. What is the purpose of the “Character” class in Java?
82. What is the purpose of the “Integer” class in Java?
83. What is the purpose of the “Double” class in Java?
84. What is the purpose of the “System” class in Java?
85. What is the purpose of the “File” class in Java?
86. What is the purpose of the “FileNotFoundException” in Java?
87. What is the purpose of the “NullPointerException” in Java?
88. What is the purpose of the “ArrayIndexOutOfBoundsException” in Java?
89. What is the purpose of the “ArithmeticException” in Java?
90. What is the purpose of the “NumberFormatException” in Java?

91. What is the purpose of the “StringBuilder” class in Java?
92. What is the purpose of the “HashSet” class in Java?
93. What is the purpose of the “HashMap” class in Java?
94. What is the purpose of the “LinkedList” class in Java?
95. What is the purpose of the “Comparator” interface in Java?
96. What is the purpose of the “Comparable” interface in Java?
97. What is the purpose of the “super” keyword in Java?
98. What is the purpose of the “this” keyword in Java?
99. What is the purpose of the “final” keyword in Java?
100. What is the purpose of the “static” keyword in Java?
101. What is the purpose of the “abstract” keyword in Java?
102. What is the purpose of the “interface” keyword in Java?
103. What is the purpose of the “package” keyword in Java?
104. What is the purpose of the “import” keyword in Java?
105. What is the purpose of the “throw” keyword in Java?
106. What is the purpose of the “throws” keyword in Java?
107. What is the purpose of the “try-catch-finally” block in Java?
108. What is the purpose of the “instanceof” operator in Java?
109. What is the purpose of the “break” statement in Java?
110. What is the purpose of the “continue” statement in Java?

Number of Pages

13 Pages

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