Download DU (University of Delhi) B-Tech 8th Semester 2341801 Web Technologies Question Paper

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Design a style sheet with the following specification:

• Set the body background colour to light blue

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• Set colour of H1 header to white
• Center align the text of H1 header
• Set font-family of paragraph to verdana

(a) What is the difference between an abstract class and an interface? Can we have instances of an interface? What is meant by ‘default methods’ in an interface? Give an example of an interface with method. (4)

var energy= fruits.join(); document.write(energy);

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Script> What is the difference between:

myClass obj;

And

myClass obj = new myClass();

(b) Explain any three types of JSP elements with the help of examples (5)

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(iii) Explain the garbage collector feature of Java. (3)

(iv) How can a class call constructor of its superclass? Explain with an example. (2)

(c) What is the use of statement object?

Section B

Attempt any FOUR questions from this section.

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1. (a) Explain HTTP request/response processing in detail. (8)

2. (a) Name different JDBC drivers. Explain different types of JDBC drivers. (8)

(b) Write a JDBC program to call a stored procedure named PROC1 with one OUT parameter of type int. (7)

3. (a) Write a JSP page to access the employee details (Employee name, Employee Id, Salary and Department) from an HTML form using JSTL actions. (8)

(b) How can you use custom tags in a JSP page? Explain with the help of a diagram. (7)

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4. (d) (i) Should we use AJAX requests? Comment. (2)

(b) Explain the anatomy of a JSP page. Give an example. (13)

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5. Find out the errors in the following code:

class myClass {

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int my_var;

final void func1(int i) {}

public void func2() { // Statements }

public static void main(String[] args) {

myClass ob = new myClass();

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ob.func2();

} (5)

6. (a) (ii) interface myInterface {

int var = 10;

void func1();

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class myClass implements myInterface {

void func2();

public static void main(String[] args) {

myInterface objInt = new myClass();

objInt.var = 20;

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} (5)

(b) What is the purpose of import statement in Java? Assume that there are two packages myPack1, myPack2 with a class myClass1 in myPack1 and myClass2 in myPack2. myClass1 uses a method meth() of myClass2. Give skeleton of class myClass1:

(i) using import statement

(ii) without using import statement (10)

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