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

Must know core Java interview questions start easier and get tougher with comprehensive coverage of multithreading & enterprise Java interview Q&As with lots of diagrams, code & industrial strength examples. Q1. What is the difference between “==” and “equals(…)” in comparing Java String objects? A1. When you use “==” (i.e.

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Posted in FAQ Core Java Job Interview Q&A Essentials, FAQ Core Java Q&As, 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
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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. Top 50+ Core Java Interview Questions Links: Q01-Q10 | Q24-Q36 on classes, interfaces and generics | Q37-Q42 on GC and referencing | Q43-Q54 on Objects Q11. What is the difference between constructors and other regular methods? A11. Constructors must have…...

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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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04: ♦ Top 10 most common Core Java beginner mistakes

Mistake #1: Using floating point data types like float or double for monetary calculations. This can lead to rounding issues.

In the above code, 2, 4, and 5 are correct and 1 and 3 are incorrect usage leading to rounding issues. So, either use BigDecimal properly as shown in 2…...

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8 Java Annotations interview Questions and Answers

Q1. Are annotations a compile time or run-time feature? A1. You can have either compile-time or run-time annotations. @Override is a simple compile-time annotation to catch little mistakes like typing tostring( ) instead of toString( ) in a subclass.

If you remove the toString( ) method in Class A…...

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