Java Reference
In-Depth Information
UnknownHostException if the host name is not recognised, we must either throw this
exception or (preferably) handle it with a catch clause. The following example
illustrates this.
import java.util.*;
public class IPFinder
public static void main(String[] args)
String host;
Scanner input = new Scanner(;
InetAddress address;
System.out.print("\n\nEnter host name: ");
host =;
address = InetAddress.getByName(host);
System.out.println("IP address: "
+ address.toString());
catch (UnknownHostException uhEx)
System.out.println("Could not fi nd " + host);
The output from a test run of this program is shown in Fig. 2.1.
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