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So far, we ve been studying servers and the DNS tree as a whole The other part of this equation is, of course, the client the host that s contacting the DNS server to resolve a hostname into an IP address NOTE You may have noticed earlier in the section The DNS Toolbox that most of the queries we were issuing were being made against the DNS server called localhost Localhost is, of course, the local system whose shell you are executing the query commands from In our case, hopefully, this system is serverAexampleorg! The reason we specified the DNS server to use was that, by default, the system will query whatever the host s default DNS server is And if it so happens that your host s DNS server is some random DNS server that your ISP has assigned you, some of the queries will fail because your ISP s DNS server will not know about the zone you manage and control locally So if we configure our local system to use our local DNS server to process all DNS-type queries, then we won t have to manually specify localhost any longer This is called configuring the resolver Under Linux, the resolver handles the client side of DNS This is actually part of a library of C programming functions that get linked to a program when the program is started Because all of this happens automatically and transparently, the user doesn t have to know anything about it It s simply a little bit of magic that lets them start browsing the Internet From the system administrator s perspective, configuring the DNS client isn t magic, but it s straightforward There are only two files involved: /etc/resolvconf and /etc/ nsswitchconf

Part II:

Here is the output of this program: Now is the time for all good men to come to the aid of their country indexOf(t) = 7 lastIndexOf(t) = 65 indexOf(the) = 7 lastIndexOf(the) = 55 indexOf(t, 10) = 11 lastIndexOf(t, 60) = 55 indexOf(the, 10) = 44 lastIndexOf(the, 60) = 55

The /etc/resolvconf file contains the information necessary for the client to know what its local DNS server is (Every site should have, at the very least, its own caching DNS

Because String objects are immutable, whenever you want to modify a String, you must either copy it into a StringBuffer or StringBuilder, or use one of the following String methods, which will construct a new copy of the string with your modifications complete

substring( )

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You can extract a substring using substring( ) It has two forms The first is String substring(int startIndex) Here, startIndex specifies the index at which the substring will begin This form returns a copy of the substring that begins at startIndex and runs to the end of the invoking string The second form of substring( ) allows you to specify both the beginning and ending index of the substring: String substring(int startIndex, int endIndex) Here, startIndex specifies the beginning index, and endIndex specifies the stopping point The string returned contains all the characters from the beginning index, up to, but not including, the ending index The following program uses substring( ) to replace all instances of one substring with another within a string:

Don t go crazy looking for an actual NXT-G block on the palettes called My Block. It doesn t exist. My Block is something that you are going to create. A My Block is a collection of NXT-G blocks that you have grouped together and may wish to reuse. My Block represents a feature that lets you build and reuse components. So let s jump right in and see how this approach of reusing components can help you.

// Substring replacement class StringReplace { public static void main(String args[]) { String org = "This is a test This is, too"; String search = "is"; String sub = "was"; String result = ""; int i; do { // replace all matching substrings Systemoutprintln(org); i = orgindexOf(search); if(i != -1) { result = orgsubstring(0, i);

server) This file has two lines The first indicates the default search domain, and the second indicates the IP address of the host s name server The default search domain applies mostly to sites that have their own local servers When the default search domain is specified, the client side will automatically append this domain name to the requested site and check that first For example, if you specify your default domain to be yahoocom and then try to connect to the hostname my, the client software will automatically try contacting myyahoocom Using the same default, if you try to contact the host wwwstatnet, the software will try wwwstatnetyahoocom (a perfectly legal hostname), find that it doesn t exist, and then try wwwstatnet alone (which does exist) Of course, you may supply multiple default domains However, doing so will slow the query process a bit, because each domain will need to be checked For instance, if both exampleorg and stanfordedu are specified, and you perform a query on wwwstat net, you ll get three queries: wwwstatnetyahoocom, wwwstatnetstanfordedu, and wwwstatnet The format of the /etc/resolvconf file is as follows:

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result = result + sub; result = result + orgsubstring(i + searchlength()); org = result; } } while(i != -1); } }

where domainname is the default domain name to search, and IP-address is the IP address of your DNS server For example, here s a sample /etc/resolvconf file:

The output from this program is shown here: This is a test This is, too Thwas is a test This is, too Thwas was a test This is, too Thwas was a test Thwas is, too Thwas was a test Thwas was, too

concat( )