Tutoring with Nirupama Narasimhan

Answer

The RequestDispatecher interface ia a part of the Java Servlet API. A servlet can forward an entire request to another component. A servlet can also include in its response content generated by another component. For example, public void doGet(HttpServletRequest req, HttpServletResponse res){ …… RequestDispatcher disp=req.getDispatcher(path); Disp.forward(req,res); }

Answer

The == operator compares two object references but the equals() method comapres characters inside a String object. the code segment

String s1="Hello"; String s2=s1; String s3=new String(s1); System.out.println("s1==s3 evaluates to "+(s1==s3)); System.out.println("s1.equals(s2) evaluates to "+s1.equals(s2));

generates the output:  s1==s3 evaluates to false

s1.equals(s2) evaluates to true

Answer

In large networks, it would be tedious for the administrator to assign IP addresses manually to devices. Dynamic Host Configuration Protocol automates this process. The DHCP server maintains a pool of IP addresses and when a client submits a arequest for an IP address, the server assigns an IP address to the client for a lease period.