@Profile annotation allow you to register components that will be selected only if its associated profile is active. You can selectively activate a set of beans in a class or all beans . [node:read-more:link]

Instead of using @ComponentScan annotation, we can also use <context:component-scan> element in an spring config xml.

spring.xml

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:context="http://www.springframework.org/schema/context"

Please follow the below guidelines for answering questions.

1. Answer within the question bank itself, without changing the name.

2. Color your answers with blue color. 

3. Color your execution results in yellow color. Sometimes you might be asked to first answer without trying out and then actually try compiling/executing it. This step is not mandatory.

Problem:

Find the middle element of linked list in one Pass.

Approach:

You can use the runner technique.  

Two pointers can be used and both will be running at separate speeds. One runner pointer can go in two steps at a time and other pointer can go in one step at a time. Second one will always cover half the distance as that of the other. When one reaches the end, other will be be middle. [node:read-more:link]

This is a quick summary of important keywords and reserved words that you should not be using as an identifier. Identifier is a name given to any class, method, interface, enum or variable that we create. There is also added quick notes section with few important keywords that may be useful for exam or interview preparations.

Keywords in Java

• class, interface, enum(added in 5.0), package, import, new, this,  super, return, void.