Mastering Java: A Golden Collection of Questions & Answers for Success: Java: 200 Key Questions for a strong programming base

Mastering Java

A Golden Collection

of

Questions & Answers for

Success

© 2024 Bashir OS

All rights reserved.

First Edition: April 2024

ISBN 978-1-4457-7869-3

No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of the publisher.

Table of contents

1 - What are static blocks and static initializers in Java?

2 - How to call one constructor from the other constructor?

3 - What is method overriding in java?

4 - What is super keyword in java?

5 - Difference between method overloading and method overriding in java?

6 - Difference between abstract class and interface?

7 - Why java is platform independent?

8 - What is method overloading in java?

9 - What is difference between C++ and Java?

10 - What is JIT compiler?

11 - What is bytecode in java?

12 - Difference between this() and super() in java?

13 - What is a class?

14 - What is an object?

15 - What is method in java?

16 - What is encapsulation?

17 - Why main method is public, static and void in java?

18 - Explain about main method in java?

19 - What is constructor in java?

20 - What is difference between length and length() method in java?

21 - What is ASCII Code?

22 - What is Unicode?

23 - Difference between Character Constant and String Constant in java?

24 - What are constants and how to create constants in java?

25 - Difference between ‘>>’ and ‘>>>’ operators in java?

26 - Explain Java Coding Standards for classes or Java coding conventions for classes?

27 - Explain Java Coding standards for interfaces?

28 - Explain Java Coding standards for Methods?

29 - Explain Java Coding Standards for variables?

30 - Explain Java Coding Standards for Constants?

31 - Difference between overriding and overloading in java?

32 - What is ‘IS-A’relationship in java?

33 - What is ‘HAS A’’ relationship in java?

34 - Difference between ‘IS-A’ and ‘HAS-A’ relationship in java?

35 - Explain about instanceof operator in java?

36 - What does null mean in java?

37 - Can we have multiple classes in single file?

38 - What all access modifiers are allowed for top class?

39 - What are packages in java?

40 - Can we have more than one package statement in source file?

41 - Can we define package statement after import statement in java?

42 - What are identifiers in java?

43 - What are access modifiers in java?

44 - What is the difference between access specifiers and access modifiers in java?

45 - What access modifiers can be used for class?

46 - Explain what access modifiers can be used for methods?

47 - Explain what access modifiers can be used for variables?

48 - What is final access modifier in java?

49 - Explain about abstract classes in java?

50 - Can we create constructor in abstract class?

51 - What are abstract methods in java?

52 - What is an exception in java?

53 - State some situations where exceptions may arise in java?

54 - What is Exception handling in java?

55 - What is an error in Java?

56 - What are advantages of Exception handling in java?

57 - In how many ways we can do exception handling in java?

58 - List out five keywords related to Exception handling?

59 - Explain try and catch keywords in java?

60 - Can we have try block without catch block?

61 - Can we have multiple catch block for a try block?

62 - Explain importance of finally block in java?

63 - Can we have any code between try and catch blocks?

64 - Can we have any code between try and finally blocks?

65 - Can we catch more than one exception in single catch block?

66 - What are checked Exceptions?

67 - What are unchecked exceptions in java?

68 - Explain differences between checked and Unchecked exceptions in java?

69 - What is default Exception handling in java?

70 - Explain throw keyword in java?

71 - Can we write any code after throw statement?

78 - Explain importance of throws keyword in java?

79 - Explain the importance of finally over return statement?

80 - Explain a situation where finally block will not be executed?

81 - Can we use catch statement for checked exceptions?

82 - What