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01: ♦ 17 FAQ Java Collection Framework (i.e. JCF) 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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Q1-Q10: ♥♦ Top 50+ Core Java Interview Questions and Answers

50+ Core Java interview questions answered for freshers to experienced Java developers. These FAQs have drill down links to more must know Core Java Interview Q&As. Q1. What is the difference between “==” and “equals(…)” in comparing Java String objects? A1. When you use “==” (i.e. shallow comparison), you are

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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

Q43. What can you tell about the performance of a HashMap compared to a TreeMap? Which one would you prefer? A43. A balanced tree does have O (log n) performance. The TreeMap class in Java maintains key/value objects in a sorted order by using a red-black tree. A red-black tree…...

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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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11: 10+ ♦ Java multi-threading scenarios interview Q&As

Java multi-threading interview questions are very popular from beginner to experienced level candidates. Many struggle, including the so called experienced. That is why interviewers love this key area of concurrency management to assess your capabilities. In Java, there are low level interfaces/classes to higher abstraction levels to implement concurrency 1)…...

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01: ♥♦15+ Java multithreading interview questions & answers

Q1. What is a thread? A1. It is a thread of execution in a program. The JVM allows an application to have multiple threads of execution running concurrently. In the Hotspot JVM there is a direct mapping between a Java Thread and a native operating system (i.e. OS) Thread. The

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