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);
		}
		catch(IOException e)
		{
			System.out.println("Accept failed");
			System.exit(1);
		}
		PrintWriter out=new PrintWriter(c.getOutputStream(),true);
		BufferedReader in=new BufferedReader(new InputStreamReader(c.getInputStream()));
		String n;
		BufferedReader sin=new BufferedReader(new InputStreamReader(System.in));
		System.out.println("Ready to type now");
		while((n=sin.readLine())!=null)
		{
			out.println(n);
		}
		out.close();
		c.close();
		n1.close();
	}
}

The post java program for Client-Server Program using TCP/IP first appeared on Student Projects.

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);
	}
}

The post Java program to display the IP Address of a particular Host first appeared on Student Projects.

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));
	}
}

The post Java program to display Local machines IP Address first appeared on Student Projects.

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);
		}
		catch(IOException e)
		{
			System.out.println("Accept failed");
			System.exit(1);
		}
		PrintWriter out=new PrintWriter(c.getOutputStream(),true);
		BufferedReader in=new BufferedReader(new InputStreamReader(c.getInputStream()));
		String n;
		BufferedReader sin=new BufferedReader(new InputStreamReader(System.in));
		System.out.println("Ready to type now");
		while((n=sin.readLine())!=null)
		{
			out.println(n);
		}
		out.close();
		c.close();
		n1.close();
	}
}

Program 2

import java.net.*;
import java.io.*;

class tcpip_client
{
	public static void main(String args[]) throws IOException
	{
		Socket s=null;
		BufferedReader b=null;

		try
		{
			s=new Socket(InetAddress.getLocalHost(),98);
			b=new BufferedReader(new InputStreamReader(s.getInputStream()));
		}

		catch(UnknownHostException u)
		{
			System.err.println("I don't know host");
			System.exit(0);
		}
		String inp;
		while((inp=b.readLine())!=null)
		{
			System.out.println(inp);
		}
		b.close();
		s.close();
	}
}

The post java program for Client-Server Program using TCP/IP first appeared on Student Projects.

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;
				case '\n':ds.send(new DatagramPacket(buffer,pos,InetAddress.getLocalHost(),777));
				           pos=0;
				break;
				default:
				buffer[pos++]=(byte) c;
			}
		}
	}

	public static void main(String args[]) throws Exception
	{
		System.out.println("Server ready..\n Please type here");
		ds=new DatagramSocket(888);
		Myserver();
	}
}

Program 2:

import java.net.*;

class udpip_client
{
	public static DatagramSocket ds;
	public static byte buffer[]=new byte[1024];

	public static void Myclient() throws Exception
	{
		while(true)
		{
			DatagramPacket p=new DatagramPacket(buffer,buffer.length);
			ds.receive(p);
			System.out.println(new String(p.getData(),0,p.getLength()));
		}
	}

	public static void main(String args[]) throws Exception
	{
		System.out.println("Client - Press CTRL+C to quit");
		ds=new DatagramSocket(777);
		Myclient();
	}
}

The post DatagramSocket and DatagramPacket (Client-Server Program using UDP/IP) first appeared on Student Projects.

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());
	}
}

The post Java program for Uniform Resource Locator (URL) first appeared on Student Projects.

import java.util.Calendar;
import java.util.Timer;
import java.util.TimerTask;
import java.awt.*;

import javax.swing.*;

import no.geosoft.cc.geometry.Geometry;
import no.geosoft.cc.geometry.Matrix4x4;
import no.geosoft.cc.graphics.*;

/**
 * Graphics program. Demonstrates:
 *
 * 

 * 
 Advaced geometry generation
 * 
 Dynamic update
 * 
 Threading
 * 
 * 
*/   
public class Demo23 extends JFrame
{
  public Demo23()
  {
    super ("G Graphics Library - Demo 23");    
    setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
    
    // Create the graphic canvas
    GWindow window = new GWindow (new Color (210, 235, 255));
    getContentPane().add (window.getCanvas());
    
    // Create scene with default viewport and world extent settings
    GScene scene = new GScene (window);
    double w0[] = {  0.0,   0.0, 0.0};
    double w1[] = {1000.0,   0.0, 0.0};
    double w2[] = {  0.0, 1000.0, 0.0};
    scene.setWorldExtent (w0, w1, w2);

    // Create clock
    GClock clock1 = new GClock (500, 500, 350);
    scene.add (clock1);

    // GClock clock2 = new GClock (40, 80, 15);
    // scene.add (clock2);

    pack();
    setSize (new Dimension (500, 500));
    setVisible (true);

    window.startInteraction (new ZoomInteraction (scene));

    Timer timer = new Timer (true);
    timer.schedule (new Ticker (clock1), 0, 1000);
  }
 
  /**
   * Defines the geometry and presentation for the sample
   * graphic object.
   */   
  private class GClock extends GObject
  {
    private double      x0_, y0_;
    private double      radius_;
    private GSegment    background_;
    private GSegment    disc_;
    private GSegment[]  ticks_;
    private GSegment[]  labels_;
    private GSegment    hourHandle_;
    private GSegment    minuteHandle_;
    private GSegment    secondHandle_;
    private GSegment    brand_;
    private double[]    hourHandleGeometry_;
    private double[]    minuteHandleGeometry_;
    private double[]    secondHandleGeometry_;
            
    public GClock (double x0, double y0, double radius)
    {
      x0_     = x0;
      y0_     = y0;
      radius_ = radius;

      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_);
      
      disc_ = new GSegment();
      GStyle discStyle = new GStyle();
      discStyle.setBackgroundColor (new Color (255, 255, 255));
      discStyle.setForegroundColor (new Color (255, 255, 255));
      disc_.setStyle (discStyle);
      addSegment (disc_);

      ticks_ = new GSegment[60];
      GStyle minuteStyle = new GStyle();
      minuteStyle.setForegroundColor (new Color (0, 0, 0));
      minuteStyle.setLineWidth (1);

      GStyle tickStyle = (GStyle) minuteStyle.clone();
      tickStyle.setLineWidth (3);
      
      for (int i = 0; i < 60; i++) {
        ticks_[i] = new GSegment();
        ticks_[i].setStyle (i % 5 == 0 ? tickStyle : minuteStyle);
        addSegment (ticks_[i]);
      }

      labels_ = new GSegment[12];
      GStyle labelStyle = new GStyle();
      labelStyle.setForegroundColor (new Color (0, 0, 0));
      labelStyle.setLineStyle (GStyle.LINESTYLE_INVISIBLE);
      labelStyle.setFont (new Font ("Dialog", Font.BOLD, 24));
      for (int i = 0; i < 12; i++) {
        labels_[i] = new GSegment();
        labels_[i].setStyle (labelStyle);
        int hour = (14 - i) % 12 + 1;
        labels_[i].setText (new GText (Integer.toString (hour)));
        addSegment (labels_[i]);
      }

      brand_ = new GSegment();
      GStyle brandStyle = new GStyle();
      brandStyle.setForegroundColor (new Color (0, 0, 0));
      brandStyle.setFont (new Font ("Times", Font.PLAIN, 12));
      brandStyle.setLineStyle (GStyle.LINESTYLE_INVISIBLE);
      brand_.setStyle (brandStyle);
      brand_.setText (new GText ("GeoSoft", GPosition.MIDDLE));
      addSegment (brand_);

      GStyle handleStyle = new GStyle();
      handleStyle.setForegroundColor (new Color (0.0f, 0.0f, 0.0f, 0.5f));
      handleStyle.setBackgroundColor (new Color (0.0f, 0.0f, 0.0f, 0.3f));
      handleStyle.setLineWidth (1);      

      GStyle secondHandleStyle = new GStyle();
      secondHandleStyle.setForegroundColor (new Color (255, 0, 0));
      secondHandleStyle.setBackgroundColor (new Color (255, 0, 0));
      secondHandleStyle.setLineWidth (1);      
      
      hourHandle_ = new GSegment();
      hourHandle_.setStyle (handleStyle);
      addSegment (hourHandle_);

      hourHandleGeometry_ = new double[]
                            {- 0.10*radius_, - 0.04*radius_,
                             - 0.10*radius_, + 0.04*radius_,
                             + 0.60*radius_, + 0.04*radius_,
                             + 0.65*radius_, 0.0,
                             + 0.60*radius_, - 0.04*radius_,
                             - 0.10*radius_, - 0.04*radius_};
      
      minuteHandle_ = new GSegment();
      minuteHandle_.setStyle (handleStyle);      
      addSegment (minuteHandle_);

      minuteHandleGeometry_ = new double[]
                            {- 0.10*radius_, - 0.04*radius_,
                             - 0.10*radius_, + 0.04*radius_,
                             + 0.90*radius_, + 0.04*radius_,
                             + 0.95*radius_, 0.0,
                             + 0.90*radius_, - 0.04*radius_,
                             - 0.10*radius_, - 0.04*radius_};

      secondHandle_ = new GSegment();
      secondHandle_.setStyle (secondHandleStyle);
      addSegment (secondHandle_);

      secondHandleGeometry_ = new double[]
                            {- 0.10*radius_, - 0.02*radius_,
                             + 0.85*radius_, 0.0,
                             - 0.10*radius_, + 0.02*radius_,
                             - 0.10*radius_, - 0.02*radius_};
    }

    private void update()
    {
      Calendar time = Calendar.getInstance();

      int hour   = time.get (Calendar.HOUR_OF_DAY);
      int minute = time.get (Calendar.MINUTE);
      int second = time.get (Calendar.SECOND);
      int secondOfDay = second + minute*60 + hour*60*60;

      double hourAngle = Math.PI / 2.0 -
                         (double) secondOfDay / (24.0 * 60.0 * 60.0) *
                         Math.PI * 4.0;

      secondOfDay -= hour*60*60;

      double minuteAngle = Math.PI / 2.0 -
                           (double) secondOfDay / (60.0 * 60.0) *
                           Math.PI * 2.0;

      secondOfDay -= minute*60;

      double secondAngle = Math.PI / 2.0 -
                           (double) secondOfDay / 60.0 *
                           Math.PI * 2.0;
      
      double[] geometry = new double[hourHandleGeometry_.length];
      System.arraycopy (hourHandleGeometry_, 0, geometry, 0,
                        hourHandleGeometry_.length);
      Matrix4x4 m = new Matrix4x4();
      m.rotateZ (hourAngle);
      m.translate (x0_, y0_, 0.0);
      m.transformXyPoints (geometry);
      hourHandle_.setGeometryXy (geometry);

      geometry = new double[minuteHandleGeometry_.length];
      System.arraycopy (minuteHandleGeometry_, 0, geometry, 0,
                        minuteHandleGeometry_.length);
      m = new Matrix4x4();
      m.rotateZ (minuteAngle);
      m.translate (x0_, y0_, 0.0);      
      m.transformXyPoints (geometry);
      minuteHandle_.setGeometryXy (geometry);

      geometry = new double[secondHandleGeometry_.length];
      System.arraycopy (secondHandleGeometry_, 0, geometry, 0,
                        secondHandleGeometry_.length);
      m = new Matrix4x4();
      m.rotateZ (secondAngle);
      m.translate (x0_, y0_, 0.0);      
      m.transformXyPoints (geometry);
      secondHandle_.setGeometryXy (geometry);
    }
    
    public void draw()
    {
      background_.setGeometryXy (Geometry.createCircle (x0_, y0_, radius_ * 1.2));
      disc_.setGeometryXy (Geometry.createCircle (x0_, y0_, radius_));

      for (int i = 0; i < 60; i++) {
        double x0 = radius_ * (i % 5 == 0 ? 0.88 : 0.92);
        double x1 = radius_ * 0.98;
        
        double[] geometry = new double[] {x0, 0, x1, 0};
        Matrix4x4 m = new Matrix4x4();
        m.rotateZ (2.0 * Math.PI * i / 60.0);
        m.translate (x0_, y0_, 0.0);
        m.transformXyPoints (geometry);
        ticks_[i].setGeometryXy (geometry);
      }

      for (int i = 0; i < 12; i++) {
        double[] geometry = new double[] {radius_ * 0.75, 0};        

        Matrix4x4 m = new Matrix4x4();
        m.rotateZ (2.0 * Math.PI * i / 12.0);
        m.translate (x0_, y0_, 0.0);
        m.transformXyPoints (geometry);

        labels_[i].setGeometryXy (geometry);
      }

      brand_.setGeometry (x0_, y0_ - radius_ * 0.3);
      
      update();
    }
  }
 
  private class Ticker extends TimerTask
  {
    private GClock clock_;
    
    public Ticker (GClock clock)
    {
      clock_ = clock;
    }
    
    public void run()
    {
      clock_.update();
      clock_.refresh();
    }
  }

  public static void main (String[] args)
  {
    new Demo23();
  }

The post Java program to display a clock first appeared on Student Projects.

import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.Container;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JApplet;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class PopupCalculatorApplet extends JApplet implements ActionListener {
  public void init() {
    Button calcButton = new Button("Calculator");
    calcButton.addActionListener(this);
    Container contentPane = getContentPane();
    contentPane.add(calcButton);
  }

  public void actionPerformed(ActionEvent evt) {
    if (calc.isVisible())
      calc.setVisible(false);
    else
      calc.show();
  }

  private JFrame calc = new CalculatorFrame();
}

class CalculatorPanel extends JPanel implements ActionListener {
  public CalculatorPanel() {
    setLayout(new BorderLayout());

    display = new JTextField("0");
    display.setEditable(false);
    add(display, "North");

    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");
  }

  private void addButton(Container c, String s) {
    JButton b = new JButton(s);
    c.add(b);
    b.addActionListener(this);
  }

  public void actionPerformed(ActionEvent evt) {
    String s = evt.getActionCommand();
    if ('0' <= s.charAt(0) && s.charAt(0) <= '9' || s.equals(".")) {
      if (start)
        display.setText(s);
      else
        display.setText(display.getText() + s);
      start = false;
    } else {
      if (start) {
        if (s.equals("-")) {
          display.setText(s);
          start = false;
        } else
          op = s;
      } else {
        calculate(Double.parseDouble(display.getText()));
        op = s;
        start = true;
      }
    }
  }

  public void calculate(double n) {
    if (op.equals("+"))
      arg += n;
    else if (op.equals("-"))
      arg -= n;
    else if (op.equals("*"))
      arg *= n;
    else if (op.equals("/"))
      arg /= n;
    else if (op.equals("="))
      arg = n;
    display.setText("" + arg);
  }

  private JTextField display;

  private double arg = 0;

  private String op = "=";

  private boolean start = true;
}

class CalculatorFrame extends JFrame {
  public CalculatorFrame() {
    setTitle("Calculator");
    setSize(200, 200);

    Container contentPane = getContentPane();
    contentPane.add(new CalculatorPanel());
  }
}

The post Java Program for calculator first appeared on Student Projects.

Output:

Java chatclient

From Server : Hi
From Client: Hi
From Server: Good morning
From Client: End
From Server:Bye

The post Java program of Client-Server network for Chatting between Client and Server first appeared on Student Projects.

Output:

Java client

Enter radius of the circle
10
From Server: Area is 314.1341345

The post Java program that finds the area of a circle using Client-Server network first appeared on Student Projects.