Java 8 has added a new method called lines() in Files class which can be used to read a file line by line in Java. The beauty of this method is that it reads all lines from a file as Stream of String, which is populated lazily as the stream is consumed. So, if you have a huge file and you only read the first 100 lines then the rest of the lines will not be loaded into memory, which results in better performance. This is slightly different from than Files.readAllLines() method (which reads all lines into a List) because this method reads the file lazily, only when a terminal operation is called on Stream e.g. forEach(), count(), etc. By using count() method you can actually count a number of lines in files or number of empty lines by filtering empty lines.
Difference between get and load in Hibernate
get vs load in Hibernate
Difference between get and load method in Hibernate is one of the most popular questions asked in Hibernate and spring interviews. Hibernate Session class provides two methods to access object e.g. session.get() and session.load() both looked quite similar to each other but there are subtle differences between load and get method which can affect the performance of the application. The main difference between get() vs load method is that get() involves database hit if an object doesn't exist in Session Cache and returns a fully initialized object which may involve several database calls while load method can return proxy in place and only initialize the object or hit the database if any method other than getId() is called on persistent or entity object.
Strategy Design Pattern and Open Closed Principle in Java - Example
Strategy design pattern is based upon open closed design principle, the 'O' of famous SOLID design principles. It's one of the popular pattern in the field of object-oriented analysis and design along with Decorator, Observer and Factory patterns. Strategy pattern allows you to encapsulate possible changes in a process and encapsulate that in a Strategy class. By doing that your process (mainly a method) depends upon a strategy, higher level of abstraction than implementation. This makes your process open for extension by providing new Strategy implementation, but closed for modification, because the introduction of a new strategy doesn't require a change in a tested method. That's how it confirms open closed design principle.
OCAJP 8 FAQ - Oracle Certified Associate Java Programmer I Certification (1Z0–808) Frequently asked Questions
The Oracle Certifications is one of the most repeated, industry-recognized certifications. It also provides Java certifications like Oracle Certified Associate Java Programmer, also known as OCAJP and Oracle Certified Professional Java Programmer, also known as OCPJP. These two are most popular Java certification and there are many benefits of passing them e.g. better chance to get a Java development job, improved performance on Java interviews, better salary rise, and promotions, and better opportunity for moving abroad.
Top 30 Linked List Algorithm Questions from Programming/Coding Interviews
The linked list is one of the most common and essential data structure and that's why you would frequently find linked list based coding questions on interviews. The range of questions can be from simple questions like finding the length of a linked list to very difficult e.g. merging two sorted linked lists. Nevertheless, the point is that you should be familiar with linked list data structure and must know how to perform basics task in the linked list e.g. adding or removing nodes from a linked list, traversing order linked list and implementing linked list in your choice of programming language e.g. Java, C++, C, or Python.
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