Java interview questions for freshers pdf. Here are the top 100 Java interview questions for freshers.

Cor Java interview questions for freshers pdf — Top 100

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1. What is Java, and why is it popular?

2. What are the main features of Java?

3. Explain the difference between JDK, JRE, and JVM.

4. What is the main difference between == and .equals() in Java?

5. Explain the concept of object-oriented programming (OOP) in Java.

6. What are the four principles of OOP, and why are they important?

7. Describe the main components of a Java program.

8. What is a class in Java, and how is it used?

9. Explain the concept of inheritance in Java with an example.

10. What is polymorphism, and how is it implemented in Java?

11. Describe the types of polymorphism in Java.

12. What is encapsulation, and why is it important in Java?

13. Explain the difference between abstract classes and interfaces.

14. What are constructors in Java, and how are they used?

15. Describe the types of constructors in Java.

16. What is method overloading, and how is it implemented in Java?

17. Explain the concept of method overriding in Java.

18. What are access modifiers, and how do they control access to class members?

19. Describe the different types of access modifiers in Java.

20. What is the ‘final’ keyword used for in Java?

21. Explain the difference between ‘final’, ‘finally’, and ‘finalize’ in Java.

22. What is static binding, and how does it differ from dynamic binding?

23. Describe the main types of variables in Java.

24. What is a static variable, and how is it different from an instance variable?

25. Explain the purpose of the ‘this’ keyword in Java.

26. What is a package in Java, and how is it used?

27. Describe the main types of packages in Java.

28. What is the purpose of importing packages in Java?

29. Explain the difference between ‘ArrayList’ and ‘LinkedList’ in Java.

30. What is the ‘HashMap’ class used for in Java?

31. Describe the main features of the ‘HashMap’ class.

32. What is the difference between ‘HashSet’ and ‘TreeSet’ in Java?

33. What is the ‘Collections’ framework in Java, and why is it used?

34. Explain the concept of generics in Java.

35. What are the benefits of using generics in Java?

36. Describe the main types of exceptions in Java.

37. What is the purpose of exception handling in Java?

38. Explain the difference between checked and unchecked exceptions.

39. Describe the main components of exception handling in Java.

40. What is the purpose of the ‘try’, ‘catch’, and ‘finally’ blocks in Java?

41. Explain the concept of multi-threading in Java.

42. What is a thread, and how is it different from a process?

43. Describe the main methods of creating threads in Java.

44. What is synchronization, and why is it important in multi-threaded programming?

45. Explain the concept of deadlock in Java.

46. Describe the main ways to prevent deadlock in Java.

47. What is the purpose of the ‘volatile’ keyword in Java?

48. Explain the difference between ‘wait()’, ‘notify()’, and ‘notifyAll()’ in Java.

49. Describe the main types of garbage collectors in Java.

50. What is the purpose of garbage collection in Java?

51. Explain the concept of memory management in Java.

52. What are the main data types in Java?

53. Describe the difference between primitive and reference data types in Java.

54. Explain the purpose of autoboxing and unboxing in Java.

55. What is type casting, and how is it implemented in Java?

56. Describe the main types of operators in Java.

57. What is the purpose of conditional statements in Java?

58. Explain the difference between ‘if’, ‘else if’, and ‘else’ in Java.

59. Describe the main types of loops in Java.

60. What is the purpose of the ‘break’ and ‘continue’ statements in Java?

61. Explain the concept of arrays in Java.

62. Describe the main types of arrays in Java.

63. What is the purpose of the ‘length’ property in Java arrays?

64. Explain the concept of varargs in Java.

65. What is the purpose of the ‘toString()’ method in Java?

66. Describe the main types of string manipulation methods in Java.

67. Explain the difference between ‘String’, ‘StringBuffer’, and ‘StringBuilder’ in Java.

68. What is the purpose of the ‘equals()’ and ‘hashCode()’ methods in Java?

69. Describe the main types of sorting algorithms in Java.

70. Explain the difference between bubble sort and quicksort in Java.

71. What is the purpose of searching algorithms in Java?

72. Describe the main types of searching algorithms in Java.

73. Explain the purpose of the ‘compareTo()’ method in Java.

74. Describe the main types of collection classes in Java.

75. What is the purpose of the ‘Comparable’ and ‘Comparator’ interfaces in Java?

76. Explain the concept of file handling in Java.

77. Describe the main types of file handling operations in Java.

78. What is the purpose of the ‘InputStream’ and ‘OutputStream’ classes in Java?

79. Explain the concept of serialization and deserialization in Java.

80. Describe the main types of input/output streams in Java.

81. What is the purpose of the ‘File’ class in Java?

82. Explain the concept of networking in Java.

83. Describe the main types of network protocols supported by Java.

84. What is the purpose of the ‘Socket

85. What is the purpose of the ‘Socket’ class in Java networking?

86. Explain the difference between TCP and UDP protocols in Java networking.

87. What is the purpose of the ‘ServerSocket’ class in Java?

88. Describe the main steps involved in creating a client-server application in Java.

89. What is the purpose of the ‘URL’ class in Java networking?

90. Explain the difference between ‘URLConnection’ and ‘HttpURLConnection’ in Java networking.

91. What is the purpose of the ‘URLConnection’ class in Java?

92. Describe the main types of exceptions thrown in Java networking.

93. What is the purpose of the ‘BufferedReader’ and ‘BufferedWriter’ classes in Java I/O?

94. Explain the concept of serialization and deserialization in Java.

95. Describe the main steps involved in serializing and deserializing objects in Java.

96. What is the purpose of the ‘ObjectInputStream’ and ‘ObjectOutputStream’ classes in Java?

97. Explain the difference between ‘FileReader’ and ‘FileWriter’ in Java I/O.

98. Describe the main types of streams in Java.

99. What is the purpose of the ‘Scanner’ class in Java?

100. Explain the concept of exception propagation in Java.

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