Protex Computer Interview Questions and Answers

Asked to write java MVC architecture and asked question on it.

Q1. Give collection framework overview. Why should we use list over other collection methodologies?
Ans. 
Collection framework provides interfaces and classes to store and manipulate groups of objects. Lists are preferred for ordered collections.
• Lists maintain insertion order and allow duplicates

• Lists provide indexed access to elements

• Lists are suitable for scenarios where elements need to be accessed by index or need to be inserted/removed frequently
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Q2. Tell me about the JDK. Is Java runs on JDK or any other tool is required? Explain why?
Ans. 
JDK stands for Java Development Kit. Java runs on JDK and no other tool is required.
• JDK is a software development kit used for developing Java applications.

• It includes tools such as Java compiler, JRE, and other development tools.

• Java runs on JDK as it provides all the necessary tools and libraries for compiling, debugging, and running Java programs.
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Q3. Do you know JSP? Explain the lifecycle of JSP?
Ans. 
Yes, JSP stands for JavaServer Pages. It is a technology used to create dynamic web pages.
• JSP lifecycle includes translation, compilation, initialization, execution, and destruction phases.

• During translation phase, JSP engine generates a servlet from the JSP page.

• Compilation phase involves compiling the generated servlet into bytecode.

• Initialization phase initializes the servlet, including calling the init() method.

• Exe...read more
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Q4. Do you know struts? How do we use struts with Java?
Ans. 
Struts is a framework used for developing Java web applications.
• Struts is a framework that implements the Model-View-Controller (MVC) design pattern.

• It provides a set of JSP custom tags to help developers create interactive web applications.

• Struts configuration is typically done using XML files.

• Struts actions are Java classes that handle requests from the user and interact with the model.

• Struts is often used in combina...read more
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Q5. Do you have any idea of SQL? What is DDL and DML in SQL? Explain with example.
Ans. 
Yes, SQL is a standard language for managing databases. DDL is for defining structure, DML is for manipulating data.
• DDL stands for Data Definition Language and is used to define the structure of database objects like tables, indexes, etc.

• DML stands for Data Manipulation Language and is used to manipulate data in the database like inserting, updating, deleting records.

• Example of DDL: CREATE TABLE Employees (ID INT, Name...read more
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Q6. What are the different type of joins? Why we use joins and how?
Ans. 
Different types of joins in SQL are inner join, left join, right join, and full outer join.
• Inner join: Returns rows when there is at least one match in both tables.

• Left join: Returns all rows from the left table and the matched rows from the right table.

• Right join: Returns all rows from the right table and the matched rows from the left table.

• Full outer join: Returns rows when there is a match in one of the tables.

• Join...read more
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