Implicit Objects

Question 1

implicit objects

Answer 1

• Java object that the developer can call directly without being explicitly declared
• aka pre-defined variables

Question 2

request object

Answer 2

request.getParameter()

• each time a client requests a page, the JSP engine creates a new object to represent that request
• it is used to request information like parameters, header information, server name, etc.
• it uses getParameter() to access the request parameter

Question 3

response object

Answer 3

e.g. response.setContentType(“text/html”)

• it is created by the container for each request to represent the response to the client
• it is used to set content type, add cookies, and redirect to the response page

Question 4

9 types of implicit objects

Answer 4

• out
• request
• response
• config
• application
• session
• pageContext
• page
• exception

Question 5

session object

Answer 5

for example,
session.getAttribute(“InvANView”)

• it is used to get, set, and remove attributes to session scope and also used to get session information