Java Interview Questions and Answers
Java Interview Questions and Answers for beginners and experts. List of frequently asked Java Interview Questions with answers by Besant Technologies. We hope these Java interview questions and answers are useful and will help you to get the best job in the networking industry. This Java interview questions and answers are prepared by Java Professionals based on MNC Companies expectation. Stay tuned we will update New Java Interview questions with Answers Frequently. If you want to learn Practical Java Training then please go through this Java Training in Chennai and Java Training in Bangalore
Best Java Interview Questions and Answers
Besant Technologies supports the students by providing Java interview questions and answers for the job placements and job purposes. Java is the leading important course in the present situation because more job openings and the high salary pay for this Java and more related jobs. We provide the Java online training also for all students around the world through the Gangboard medium. These are top Java interview questions and answers, prepared by our institute experienced trainers.
Java interview questions and answers for the job placements
Here is the list of most frequently asked Java Interview Questions and Answers in technical interviews. These questions and answers are suitable for both freshers and experienced professionals at any level. The questions are for intermediate to somewhat advanced Java professionals, but even if you are just a beginner or fresher you should be able to understand the answers and explanations here we give.
Q1. Define is JavaScript?
JavaScript is an Object based Programming language and it is server side scripting language that can be used into HTML pages and accessed by web browsers.
Q2. What are the Data Types in JavaScript?
Number, String, Object, Undefine, Boolean, Function.
Q3. Which company is introduced JavaScript?
Netscape software Company is developed JavaScript language.
Q4. Define negative infinity?
Dividing negative value by zero.
Q5. Define ‘this’ keyword?
‘This’ keyword is used to refer object.
Q6. Explain Arrow functions?
Arrow functions is not be used in constructors and it can’t supports this, super, arguments.
Q7. What is the symbol used for comments line?
//———– (Single line comments)
/*————*/ (Multi Line Comment)
Q8. What is the functionality of === operator?
=== is used to check two operands are having the equal value without any type conversion.
Q9. Define Variable typing?
It is used to assigning a number to a variable and the variable also is assign to a string.
Q10. Define the functionality of delete operator?
Delete is used to delete the property and its value and delete is keyword.
Q11. Define the use of Void(0)?
It is used to refer another method without refresh a page and It is used to prevent a page from refresh.
Q12. What is an alert box?
It displays only a single button and the button to display as OK button.
Q13. What is a confirmation box?
It displays a two buttons and the button to display as OK and cancel.
Q14. What are JavaScript Cookies?
It is a small test files stored in a computer system and it gets stored when the user browser the websites and it stores data.
Q15. What is break statements?
Break statement is used to exits from the loop.
Q16. What is continue statements?
Continue statement is used to continue with the loop.
Q17. What are two types of dataypes?
The two types of dataypes are Primitive and Reference types.
Q18. What is the Functionality of typeof operator?
It used to return a string value to a type of a variable.
Q19. What is the Functionality of blur function?
It is used to remove the focus of a specified object.
Q20. What are the types of errors?
They are three types of errors in JAVA script Logical Errors, Run time errors and Load time errors.
Q21. What is called as event bubbling?
When the handler of the child is clicked by nested of DOM element and the handler of parent is also clicked.
 Q22. What are the Boolean operators used in JavaScript?
- ‘And’ (&&)
- ‘Or’ (||)
- ‘Not’ (!)
Q23. What are the properties Screen objects?
Avail Height, Avail Width, Colour Depth, Height, Width.
Q24. What is the Functionality of Push method?
It is used to append or add a one or more elements at the end of an Array and it append multiple elements by passing multiple arguments in array.
Q25. What is the Functionality of shift method?
The shift method is same as the pop method but the difference is that the pop get value at the end of the array and shift is works on staring of array.
Q26.What is the syntax for message popup in java script?
Ans : Alert(‘Hello World’);
Q27.What is syntax for function with input parameter?
Ans : function(<input parameter>){Â <code><eg.var te=input>}
Q28.How to use JavaScript in aspx page?
Ans : write code wthin script tag
Q29.How to use JavaScript file in asp.net?
Ans : add js in .net project and add link in header tag.
Q30.Where JavaScript reference link can be used in asp.net?
Ans : Header tag
Q31.Whether can be connected external db in JavaScript?
Ans : No
Q32.How to declare variable in JavaScript?
Ans : var <variable name>
Q33.How to assign value to variable in JavaScript?
Variable_name=’value’
  Q34.How to call function from another JavaScript?
Ans : function()
Q35.Whether JavaScript has OOPs concept?
Ans : Yes