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01: ♦ 17 Java Collections interview Q&As on differences between X & Y

Java Collection interview questions and answers and Java String class interview Q&As are must know as you can’t write any decent Java application without these 2 APIs. This post focuses on Java Collection interview Q&As on differences between X and Y. These Q&As are discussed in more detail in the…...

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Posted in Collection and Data structures, Differences Between X & Y, FAQs Core Java, member-paid
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12: ♦ 5 Java multithreading scenarios interview questions answered

This extends Q1. Can you give some scenarios where you had used multi-threading in Java applications? Q2. Can you give some scenarios where you used the synchronized keyword in Java? A2. Firstly, you need to assume that your code is always going to be accessed by multiple threads. Scenario 1:…...

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♥♦ Q1-Q10: Top 50+ Core Java Interview Questions and Answers

Java interview questions and answers with detailed diagrams & working code to fast-track your Java interview preparation. Q1. What is the difference between “==” and “equals(…)” in comparing Java String objects? A1. When you use “==” (i.e. shallow comparison), you are actually comparing the two object references to see if

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Posted in FAQs Core Java, FAQs Free, Top 50+ FAQ Core Java Interview Q&A
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02: ♦ Java 8 Streams, lambdas, intermediate vs terminal ops, and lazy loading with simple examples

A stream is an infinite sequence of consumable elements (i.e a data structure) for the consumption of an operation or iteration. Any Collection<T> can be exposed as a stream. It looks complex, but once you get it, it is very simple. The operations you perform on a stream can either…...

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Posted in Collection and Data structures, FP, Java 8, Java 8 Tutorial, member-paid
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♦ Q11-Q23: Top 50+ Core on Java OOP Interview Questions & Answers

The focus is on Java OOP interview questions and answers. Q11. What is the difference between constructors and other regular methods? A11. Constructors must have the same name as the class name and cannot return a value. The constructors are called only once per creation of an object while regular…...

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♦ Q43-Q54: Top 50+ Core on Java Objects Interview Questions & Answers

FAQ interview questions answered on Java objects. Top 50+ Core Java Interview Questions Links: Q01-Q10 | Q11-Q23 on OOP | Q24-Q36 on classes, interfaces and generics | Q37-Q42 on GC and referencing Q43. What can you tell about the performance of a HashMap compared to a TreeMap? Which one would…...

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♦ Q37-Q42: Top 50+ Core on Java Garbage Collection Interview Questions & Answers

As a Java developer, you may not need to know how the JVM works, but the most important topic that you must know is Java Garbage Collection. How the Garbage Collection and object referencing work in Java. Top 50+ Core Java Interview Questions Links: Q01-Q10 | Q11-Q23 on OOP |…...

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♦ Q24-Q36: Top 50+ Core on Java classes, interfaces and generics interview questions & answers

Focus is on Java classes, interfaces and generics the interview questions and answers style. Java classes and interfaces are the building blocks. Top 50+ Core Java Interview Questions Links: Q01-Q10 | Q11-Q23 on OOP | Q37-Q42 on GC and referencing | Q43-Q54 on Objects Q24. What happens when a parent…...

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