Most of these questions has been answered in my eBook "Cracking the Core Java Interview" updated on June 2018, that you can buy from this link:
UBS Top 10 Java Interview Questions
Carvia Tech | May 18, 2019 | 2 min read | 1,271 views | investment banking
Focus is mostly on Engineering Processes and Code Quality. You must be aware of Agile, Test Driven Development (TDD), various frameworks for Unit Testing, Integration Testing, etc. A good hold over concepts like Multi-threading, Java Memory Model, Garbage Collection, Algorithms, Java Collections, Queues is required. Developer should be familiar with the IDE and its shortcuts - IntelliJ IDEA or Eclipse STS.
Talk about concurrency utils i.e. Atomic package?
What is a future? How is it used in ExecutorService?
What is difference between ExecutorService and ForkJoinPool?
How will you implement your own thread-safe blocking queue in Java?
What is decorator design pattern?
What is Singleton Design Pattern, how will you make it thread-safe?
How will you design online library management system using TDD and Agile? Using testcases for requirements.
Books and References
Head First Design Patterns
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Recommended books for interview preparation:
- Spring Boot with GMAIL SMTP
- Mandrill emails in Spring Boot Java
- Top 30 Hibernate and Spring Data JPA interview questions
- Generating variable length secure key/secret in Java
- Reverse the bits of a number and check if the number is palindrome or not
- MD5 and SHA256 in Java Kotlin and Android
- Spring Security 5 - There is no PasswordEncoder mapped for the id
- Inter-thread communication in Java
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- Static method synchronization aka Class Lock in Java
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