Java Interview Masterclass: Top 350 Questions (PDF)(2024)

سرفصل های دوره

Topics - Java Coding/ OOPS/ Exception Handling/ Collections/ Multithreading/ Generics/ Spring Boot/ MVC/ REST Services

1. Introduction

1.1 Java-Code.zip

1. Course Structure and Introduction (PDF books attached in resources)

Files.zip

2. Java-Basics

1. Java-Basics Introduction

2. Q. What is Java

3. Q. What are JDK, JRE & JVM How a Java program compiled or executed

4. Q. What is compile-time and run-time in Java

5. Q. What are the main features and advantages of Java

6. Q. How Java is platform independent Why convert java code to bytecode

7. Q. How to setup VS Code for Java (not an interview question)

8. What is the role of public, static and void in it

9. Q. What is Java Bytecode What is high-level, low-level code

3. Variables & Data types

1. Variables & Data types

2. Q. What are variables & data types What are the types of data types

3. Q. What are primitive data types

4. Q. What are reference non-primitive data types

5. Q. What are the differences between primitive and reference data types

4. Operators

1. Operators Introduction

2. Q. What are Operators What the types of operators in Java

3. Q. What are Arithmetic Operators

4. Q. What are Assignment Operators

5. Q. What are Comparison Operators When to use them

6. Q. What are Logical Operators When to use them

7. Q. What are Unary Operators

8. Q. What are Ternary (Conditional) Operators

9. Q. What is instanceOf Operator

5. Control statements - Basics

1. Control statements - Basics - Introduction

2. Q. What are control statements in Java

3. Q. What are conditional statements What is if-elseif-else condition

4. Q. What are looping statements in Java What is while loop

5. Q. What is the difference between while loop and for loop

6. Q. What is the difference between break and continue statement

6. Control statements - Advanced

1. Control statements - Advanced - Introduction

2. Q. What is the difference between while loop and do-while loop

3. Q. How to decide which loop(for, while, do-while) to use in real applications

4. Q. What is the difference btw for loop and for-each loop When to use for-each l

5. Q. What is switch statement

6. Q. When to use which type of conditional statements in real applications

7. Mock Interview Question and Answers - 1

1. Java-Basics, Variables & Data types, Operators, Control statements

2. Java-Basics, Variables & Data types, Operators, Control statements

8. String & StringBuilder

1. String & StringBuilder - Introduction

2. Q. What is StringBuilder Difference between String and StringBuilder

3. Q. When to use String and when to use StringBuilder in real applications

4. Q. What is the concept of string pool in Java

5. Q. Difference between == and equals() method for comparing strings

6. Q. What are the important methods of String class

9. Arrays

1. Arrays

2. Q. What is an Array Why we need array in real applications

3. Q. How to declare and initialize an array How to access array elements

4. Q. What is the length property of an array

5. Q. How do you iterate over an array in Java

10. OOPS - Classes, Objects & Package

1. OOPS - Classes, Objects & Package - Introduction

2. Q. What is OOPS What are the main concepts of OOPS

3. Q. What are classes and objects Why use them in applications

4. Q. How to implement classes and objects in Java

5. Q. What are the members of class

6. Q. What is the role and benefit of package in Java

11. OOPS - Access Specifiers, Getter-Setter & this keyword

1. OOPS - Access Specifiers, Getter-Setter & this keyword

2. Q. What are access specifiers What are public and private specifiers

3. Q. What is the role of default access specifier Difference btw public, private

4. Q. What is the role of this keyword in java When to use it

5. Q. Why to use same names for class fields and parameter name in Setter method

6. Q. What are getter and setter methods

7. Q. What are the advantages of getter and setter methods

8. Q. What are the 4 principles pillars of OOPS

12. Mock Interview Question and Answers - 2

1. OOPS - Classes, Objects, Access Specifiers, Getter-Setter & this keyword

2. OOPS - Classes, Objects, Access Specifiers, Getter-Setter & this keyword

13. OOPS - Inheritance

1. OOPS - Inheritance - Introduction

2. Q. What is inheritance and when to use inheritance in real applications

3. Q. How to implement inheritance in Java

4. Q. What are the different types of Inheritance When to use what

5. Q. What is multiple inheritance Does Java support it

6. Q. Why Java does not support multiple inheritance of classes

7. Q. What is the alternative of multiple inheritance in Java

8. Q. How to prevent a class from being inherited

14. OOPS - Polymorphism

1. OOPS - Polymorphism - Introduction

2. Q. What is polymorphism

3. Q. What are the types of polymorphism

4. Q. What is Method Overloading How to implement it and when to use it

5. Q. Why do we call method overloading as a type of compile-time or early binding

6. Q. In how many ways can a method be overloaded

7. Q. If two same methods have different return type, then are methods are overload

8. Q. What is Method Overriding

9. Q. Why to use method overriding Why dont we have different name methods

10. Q. How to implement method overriding

11. Q. Why we call method overriding as a run-time or late binding

12. Q. What are the 5 differences between Overloading and Overriding

13. Q. What are Annotations in Java

15. OOPS - Encapsulation & Abstraction

1. OOPS - Encapsulation & Abstraction - Introduction

2. Q. What is Encapsulation

3. Q. How to achieve Encapsulation in Java

4. Q. What are the advantages of Encapsulation in Java

5. Q. What is Abstraction How to implement abstraction

6. Q. What is the difference between abstraction and encapsulation

16. Mock Interview Question and Answers - 3

1. OOPS - Inheritance, Polymorphism, Encapsulation & Abstraction

2. OOPS - Inheritance, Polymorphism, Encapsulation & Abstraction

17. Abstract class & Interface

1. Abstract class & Interface - Introduction

2. Q. What is abstract class In Java How to implement it

3. Q. When to use abstract class in real applications

4. Q. What are interfaces in Java How to implement it

5. Q. When to use interfaces in real applications

6. Q. Differences between an Abstract class & an Interface

7. Q. What are default methods When to use default methods

8. Q. Can you create an instance of an Abstract class or an Interface

9. Q. Do abstract class can have Constructors What is the use of that constructor

10. Q. Do Interface can have a constructor

11. Q. When to use Interface and when Abstract class in real applications

12. Q. How to achieve abstraction Abstraction vs Abstract class

18. Constructors

1. Constructors - Introduction

2. Q. What is Constructor in Java

3. Q. What are the types of constructors What is Default constructor

4. Q. What is Parameterized constructor When to use it in real applications

5. Q. What is constructor overloading When to use it in real applications

6. Q. What is constructor chaining

7. Q. What is copy constructor

8. Q. When to use copy constructor in real applications

9. Q. Can a constructor have a return type

10. Q. What will happen if no constructor is defined inside the class

11. Q. What is the role of super keyword

19. Mock Interview Question and Answers - 4

1. Abstract class & Interface, Constructors

2. Abstract class & Interface, Constructors

20. Exception Handling - Basics

1. Exception Handling - Basics - Introduction

2. Q. What is Exception Handling How to implement it in Java

3. Q. What is the role of finally in exception handling

4. Q. When to use finally in real applications

5. Q. Can we have multiple catch blocks

6. Q. What is catch-all block Is it a good practice in real applications

7. Q. Can we execute all catch blocks at one time

21. Exception Handling - Advanced

1. Exception Handling - Advanced - Introduction

2. Q. What is the role of throw keyword in exception handling When to use it

3. Q. What is the role of throws keyword in exception handling

4. Q. What are the differences between throw and throws keywords

5. Q. What are the types of exceptions in Java

6. Q. What are checked and unchecked exceptions

22. Mock Interview Question and Answers - 5

1. Exception Handling

2. Exception Handling

23. Collections - Basics

1. Collections - Basics - Introduction

2. Q. What are collections and what is their use in Java

3. Q. What are the types of collections in Java

4. Q. What are Iterable & Collection interfaces

5. Q. What are List, Queue & Set collections What is the difference between them

6. Q. What is Arraylist How to implement it and when to use it

7. Q. What are the differences between Array and Arraylist

8. Q. What is HashSet What are the differences btw ArrayList(List) & HashSet(Set)

9. Q. What is Map In Java Which classes implements Map interface

10. Q. What is HashMap In Java How to implement it and when to use it

11. Q. What are the differences btw HashSet(Set) and HashMap(Map)

24. Collections - Advanced

1. Collections - Advanced - Introduction

2. Q. What is LinkedList in Java What are Singly and Doubly linked list

3. Q. How to implement LinkedList Difference between Arraylist & LinkedList

4. Q. What are Collections

5. Q. What is TreeSet in Java What is the difference between HashSet and TreeSet

6. Q. What is the difference between HashMap and HashTable

7. Q. What are the advantages of using collections

25. Mock Interview Question and Answers - 6

1. Collections

2. Collections

26. Multithreading - Overview

1. Multithreading - Overview - Introduction

2. Q. What is Process and Thread What is the difference between them

3. Q. Explain Multithreading What is the advantage of it

4. Q. What is Main Thread & Daemon Thread in Java

27. Multithreading - Implementation

1. Multithreading - Implementation

2. Q. In how many ways we can implement multithreading in Java

3. Q. How to implement multithreading using Thread class

4. Q. How to implement multithreading using Runnable Interface

5. Q. What is the differences between Thread class & Runnable interface

6. Q. What are some important methods of Thread class

28. Mock Interview Question and Answers - 7

1. Multithreading

2. Multithreading

29. Generics - Basics

1. Generics - Basics - Introduction

2. Q. What is the role of Generics in Java

3. Q. What is a Generic method How to implement Generic method

4. Q. What is a Generic class How to implement Generic class

5. Q. What are type parameters and type arguments What is T in Generic class

6. Q. When to use Generic method and when to use Generic class in Java

30. Generics - Advanced

1. Generics - Advanced - Introduction

2. Q. What are bounded type parameters in generics

3. Q. Can primitive types be used as type arguments in generics

4. Q. How to use Generics with Collections

5. Q. What is Type Safety How generics provide type safety

6. Q. What is Type casting How generics eliminates type casting

7. Q. What are the advantages of using Generics

31. Mock Interview Question and Answers - 8

1. Generics

2. Generics

32. Lambda expression

1. Lambda expression - Introduction

2. Q. What is lambda expression and lambda operator

3. Q. What is the difference between normal interface and functional interface

4. Q. How to use lambda expression to implement functional interfaces

5. Q. Can we use lambda expression for non-functional interfaces

33. Types of Classes - Inner class & Final class

1. Types of Classes - Inner class & Final class - Introduction

2. Q. What are the types of classes in Java

3. Q. What are Inner Classes (Nested Classes)

4. Q. What is Final class in Java

5. Q. What is Final method in Java

6. Q. What is the role of final keyword

34. Types of Classes - Static class & Enum

1. Types of Classes - Static class & Enum

2. Q. What is the role of Static method

3. Q. When to use static methods in real applications

4. Q. What is Static nested class

5. Q. What is the role of static keyword in Java

6. Q. What is Enum What is the use of it in real applications

7. Q. How to use and implement Enums

35. Mock Interview Question and Answers - 9

1. Types of Classes

2. Types of Classes

36. Coding Question and Answers

1. Array Coding Problems

2. Q. What are the must-know pre-requisites for solving basic coding problems

3. Q. What is the common approach for solving coding problems

4. Q. Write a function to calculate the sum of all elements in an array.

5. Q. Write a function to calculate the average of an array of numbers.

6. Q. Write a function to find the smallest number in an array.

7. Q. Write a function to find the largest number in an array.

8. Q. Write a function to find the second largest number in an array.

37. Array Coding Problems Using Functions

1. Array Coding Problems Using Functions

2. Q. What are the top 5 important array functions used in coding problems

3. Q. Write a function to check whether two arrays are same or not

4. Q. Function to check if a given array is sorted in ascending order or Not

5. Q. Write a function to merge two arrays into a single sorted array.

6. Q. Write a function to remove a specific element from an array.

38. String Coding Problems

1. String Coding Problems

2. Q. Write a function that counts the number of characters in a string

3. Q. How to iterate a string

4. Q. Write a function that returns the reverse of a string

5. Q. Write a function that checks whether a given string is a palindrome or not

39. String Coding Problems Using Functions

1. String Coding Problems Using Functions

2. Q. What are the important methods of String class

3. Q. What are some more important methods of String class

4. Q. Write a function that returns the longest word in the sentence.

5. Q. Write a function to remove all whitespace characters from a string.

6. Q. Write a function that counts the number of vowels in a string

7. Q. Write a function that checks whether two strings are anagrams or not

40. Number Coding Problems

1. Number Coding Problems

2. Q. Write a function to calculate the factorial of a number.

3. Q. What is the difference between ++i and i++

4. Q. Write a function that checks whether a number is prime or not

5. Q. How to swap two numbers in Java

6. Q. Write a function to calculate the GCD for two numbers.

7. Q. Write a function to sum the digits of a number.

8. Q. Write a function to calculate the Fibonacci sequence up to a given number.

41. Coding Algorithms

1. Coding Algorithms

2. Q. Write a function to sort an array of numbers in ascending order(Bubble Sort).

3. Q. Write a function to search an element in any array(Binary Search)

4. End

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