Program : To display the IP Address of a particular Host By : Kapil Lohia import java.net.*; import java.io.*;   public class ip_host { public static void main(String args[]) throws Exception { System.out.println("Enter the host name :"); String n=new DataInputStream(System.in).readLine();   InetAddress ipadd =InetAddress.getByName(n);   System.out.println("IP address :"+ipadd); } }

Program : To display Local machines IP Address By : Kapil Lohia import java.net.*; import java.io.*;   public class ip_localmachine { public static void main(String args[]) throws Exception { InetAddress ipadd =InetAddress.getLocalHost(); System.out.println("Host and Address :"+ipadd); System.out.println("Host name :"+ipadd.getHostName());   String n=ipadd.toString(); System.out.println("IP address :"+n.substring(n.indexOf("/")+1)); } }

Program : Client-Server Program using TCP/IP By : Kapil Lohia Program 1:   import java.net.*; import java.io.*;   class tcpip_server { public static void main(String args[]) throws IOException { ServerSocket n1=null; try { n1=new ServerSocket(98); } catch(IOException e) { System.err.println("Port 98 could not be found"); System.exit(1); } Socket c=null; try { c=n1.accept(); System.out.println("Connection from "+c); [...]

Program : DatagramSocket and DatagramPacket (Client-Server Program using UDP/IP) By : Kapil Lohia Program 1 :   import java.net.*;   class udpip_server { public static DatagramSocket ds; public static byte buffer[]=new byte[1024];   public static void Myserver() throws Exception { int pos=0; while(true) { int c=System.in.read(); switch(c) { case -1: System.out.println("Server quits"); return; case ‘\r’:break; [...]

Program : Uniform Resource Locator (URL) By : Kapil Lohia import java.net.*; import java.io.*;   class url { public static void main(String args[]) throws Exception { URL n1 = new URL("http://java.sun.com:80/docs/index#down"); System.out.println("Protocol:"+n1.getProtocol()); System.out.println("Host :"+n1.getHost()); System.out.println("File Name :"+n1.getFile()); System.out.println("Port :"+n1.getPort()); System.out.println("Reference :"+n1.getRef()); } }

background_ = new GSegment();
GStyle backgroundStyle = new GStyle();
backgroundStyle.setBackgroundColor (new Color (122, 136, 161));
backgroundStyle.setForegroundColor (new Color (0, 0, 0));
background_.setStyle (backgroundStyle);
addSegment (background_);

JPanel p = new JPanel();
p.setLayout(new GridLayout(4, 4));
String buttons = “789/456*123-0.=+”;
for (int i = 0; i < buttons.length(); i++)
addButton(p, buttons.substring(i, i + 1));
add(p, “Center”);

BufferedReader cin=newBufferedReader(newInputStreamReader(sk.getInputStream()));
PrintStream cout=new PrintStream(sk.getOutputStream());
BufferedReader stdin=new BufferedReader(new InputStreamReader(System.in));

ServerSocket ss=new ServerSocket(2000);
Socket s=ss.accept();
BufferedReader br=new BufferedReader(newInputStreamReader(s.getInputStream()));
double rad,area;
String result;

figure f=new figure(45,6);
rectangle r=new rectangle(10,30);
triangle t=new triangle(10,20);
figure a;
a=f;
System.out.println(a.area());