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Advanced Java Practical File

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Advanced Java Practical File

  1. 1. Q1. Write a program in java to explain the concept of “THREADING”.Solution: -Threads can be implemented in two ways – 1. By Extending the THREAD class. 2. By Implementing the RUNNABLE class.Implementing the “Runnable” class.CODE –class NewThread implements Runnable{ Thread t; NewThread() { t = new Thread(this, "Demo Thread"); System.out.println("Child thread: " + t); t.start(); } public void run() { try { for(int i = 5; i > 0; i--) { System.out.println("Child Thread: " + i); Thread.sleep(500); } } catch (InterruptedException e) { System.out.println("Child interrupted."); } System.out.println("Exiting child thread."); }}class ThreadDemo{ public static void main(String args[]) { new NewThread(); // createa new thread try { for(int i = 5; i > 0; i--) { System.out.println("Main Thread: " + i); Thread.sleep(1000); } } catch (InterruptedException e) { System.out.println("Main thread interrupted."); } System.out.println("Main thread exiting."); }}
  2. 2. OUTPUT –Extending the “THREAD” class.CODE –class Share extends Thread{ static String msg[]={"This", "is", "a", "synchronized", "variable"}; Share(String threadname) { super(threadname); } public void run() { display(getName()); } public void display(String threadN) { synchronized(this){ for(int i=0;i<=4;i++) { System.out.println(threadN+msg[i]); } try { this.sleep(1000); } catch(Exception e) { } }}}class Sync{ public static void main(String[] args) { Share t1=new Share("Thread One: "); t1.start(); Share t2=new Share("Thread Two: "); t2.start(); }}
  3. 3. OUTPUT –Q2. Write a program in java to implement Socket Programming.Solution: -A Client – Server Chat ProgramCODE –CLIENT.JAVAimport java.net.*;import java.io.*;public class Client implements Runnable{ Socket s; BufferedReader br; BufferedWriter bw; BufferedReader ppp; String input = null; public static void main(String[] args) { new Client(); } public void run() { try { s.setSoTimeout(1); } catch(Exception e) { } while (true) { try { System.out.println("Server: "+br.readLine()); } catch (Exception h) { } } } public Client()
  4. 4. { try { s = new Socket("127.0.0.1",100); br = new BufferedReader(new InputStreamReader(s.getInputStream())); bw = new BufferedWriter(new OutputStreamWriter(s.getOutputStream())); ppp = new BufferedReader(new InputStreamReader(System.in)); Thread th; th = new Thread(this); th.start(); bw.write("Hello Server"); bw.newLine(); bw.flush(); while(true) { input = ppp.readLine(); bw.write(input); bw.newLine(); bw.flush(); } } catch(Exception e) { } }}SERVER.JAVAimport java.net.*;import java.io.*;public class ServerApp implements Runnable{ ServerSocket s; Socket s1; BufferedReader br; BufferedWriter bw; BufferedReader ppp; String input = null; public void run() { try { s1.setSoTimeout(1); } catch(Exception e) { } while (true) { try { System.out.println("Client: "+br.readLine()); } catch (Exception h) { } } } public static void main(String arg[]) { new ServerApp(); } public ServerApp()
  5. 5. { try { s = new ServerSocket(100); s1=s.accept(); br = new BufferedReader(new InputStreamReader(s1.getInputStream())); bw = new BufferedWriter(new OutputStreamWriter(s1.getOutputStream())); ppp = new BufferedReader(new InputStreamReader(System.in)); Thread th; th = new Thread(this); th.start(); while(true) { input = ppp.readLine(); bw.write(input); bw.newLine(); bw.flush(); } } catch(Exception e) { } }}OUTPUT –Q3. Write a program in java for Sending E-Mails.Solution: -import java.util.Date;import java.util.Properties;import javax.mail.Message;import javax.mail.Session;import javax.mail.Transport;import javax.mail.internet.MimeMessage;
  6. 6. public class Gmail{ public static void main(String ss[]) { String host = "smtp.gmail.com"; String username = "somgaj"; String password = "qwaszx,.12/3"; try { Properties props = new Properties(); props.put("mail.smtps.auth", "true"); props.put("mail.from","somgaj@gmail.com"); Session session = Session.getInstance(props, null); Transport t = session.getTransport("smtps"); t.connect(host, username, password); MimeMessage msg = new MimeMessage(session); msg.setFrom(); msg.setRecipients(Message.RecipientType.TO, "somgaj@gmail.com"); msg.setSubject("Hello Soumya!!"); msg.setSentDate(new Date()); msg.setText("Hi! FROM JAVA....If you recieve this, it is a success...."); t.sendMessage(msg, msg.getAllRecipients()); } catch(Exception ee) { System.out.println(ee.toString()); } }}OUTPUT –
  7. 7. Q4. Write a program in java for Implementing Calculator in an Applet.Solution: -CODE –CAL.JAVAimport java.awt.*;import java.awt.event.*;import java.applet.*;class Cal extends Applet implements ActionListener{ String msg=" "; int v1,v2,result; TextField t1; Button b[]=new Button[10]; Button add,sub,mul,div,clear,mod,EQ; char OP; public void init() { Color k=new Color(120,89,90); setBackground(k); t1=new TextField(10); GridLayout gl=new GridLayout(4,5); setLayout(gl); for(int i=0;i<10;i++) { b[i]=new Button(""+i); } ad=new Button("add"); sub=new Button("sub"); mul=new Button("mul"); div=new Button("div"); mod=new Button("mod"); clear=new Button("clear"); EQ=new Button("EQ"); t1.addActionListener(this); add(t1); for(int i=0;i<10;i++) { add(b[i]); } add(ad); add(sub); add(mul); add(div); add(mod); add(clear); add(EQ); for(int i=0;i<10;i++) { b[i].addActionListener(this); } ad.addActionListener(this); sub.addActionListener(this); mul.addActionListener(this); div.addActionListener(this); mod.addActionListener(this); clear.addActionListener(this); EQ.addActionListener(this); }
  8. 8. public void actionPerformed(ActionEvent ae) { String str=ae.getActionCommand(); char ch=str.charAt(0); if ( Character.isDigit(ch)) t1.setText(t1.getText()+str); else if(str.equals("ad")) { v1=Integer.parseInt(t1.getText()); OP=+; t1.setText(""); } else if(str.equals("sub")) { v1=Integer.parseInt(t1.getText()); OP=-; t1.setText(""); } else if(str.equals("mul")) { v1=Integer.parseInt(t1.getText()); OP=*; t1.setText(""); } else if(str.equals("div")) { v1=Integer.parseInt(t1.getText()); OP=/; t1.setText(""); } else if(str.equals("mod")) { v1=Integer.parseInt(t1.getText()); OP=%; t1.setText(""); } if(str.equals("EQ")) { v2=Integer.parseInt(t1.getText()); if(OP==+) result=v1+v2; else if(OP==-) result=v1-v2; else if(OP==*) result=v1*v2; else if(OP==/) result=v1/v2; else if(OP==%) result=v1%v2; t1.setText(""+result); } if(str.equals("clear")) { t1.setText(""); } }}
  9. 9. CALCULATOR.HTML<html><applet code=Cal.class height=500 width=400></applet></HTML>OUTPUT –
  10. 10. Q6. Write a program in java for Implementing RMI.Solution: -An applet using RMI implementing a calculator.CODE –CLIENT.JAVAimport java.rmi.*;import java.rmi.registry.*;import java.awt.*;import java.awt.event.*;class mathClient extends Frame implements ActionListener{ Button B1=new Button("Sum"); Button B2=new Button("Subtract"); Button B3=new Button("Multiply"); Button B4=new Button("Divide"); Label l1=new Label("Number 1"); Label l2=new Label("Number 2"); Label l3=new Label("Result"); TextField t1=new TextField(20); TextField t2=new TextField(20); TextField t3=new TextField(20); public mathClient() { super("Calculator"); setLayout(null); l1.setBounds(20,50,55,25); add(l1); l2.setBounds(20,100,55,25); add(l2); l3.setBounds(20,150,55,25); add(l3); t1.setBounds(150,50,100,25); add(t1); t2.setBounds(150,100,100,25); add(t2); t3.setBounds(150,150,100,25); add(t3); B1.setBounds(20,200,80,25); add(B1); B2.setBounds(100,200,80,25); add(B2); B3.setBounds(180,200,80,25); add(B3); B4.setBounds(260,200,80,25); add(B4); B1.addActionListener(this); B2.addActionListener(this); B3.addActionListener(this); B4.addActionListener(this); addWindowListener( new WindowAdapter() { public void windowClosing(WindowEvent e) { System.exit(0); } }
  11. 11. ); }public void actionPerformed(ActionEvent AE){ if(AE.getSource()==B1) { sum(); } else if(AE.getSource()==B2) { subt(); } else if(AE.getSource()==B3) { mult(); } else if(AE.getSource()==B4) { div(); } }public void sum(){ int i=Integer.parseInt(t1.getText()); int j=Integer.parseInt(t2.getText()); int val; try { String ServerURL="MathServ"; mathInterface MI=(mathInterface)Naming.lookup(ServerURL); val=MI.add(i,j); t3.setText(""+val); } catch(Exception ex) { System.out.println("Exception:"+ex); } }public void subt(){ int i=Integer.parseInt(t1.getText()); int j=Integer.parseInt(t2.getText()); int val; try { String ServerURL="MathServ"; mathInterface MI=(mathInterface)Naming.lookup(ServerURL); val=MI.subt(i,j); t3.setText(""+val); } catch(Exception ex) { System.out.println("Exception:"+ex); } }public void mult(){ int i=Integer.parseInt(t1.getText()); int j=Integer.parseInt(t2.getText()); int val; try { String ServerURL="MathServ"; mathInterface MI=(mathInterface)Naming.lookup(ServerURL); val=MI.mult(i,j);
  12. 12. t3.setText(""+val); } catch(Exception ex) { System.out.println("Exception:"+ex); } } public void div() { int i=Integer.parseInt(t1.getText()); int j=Integer.parseInt(t2.getText()); int val; try { String ServerURL="MathServ"; mathInterface MI=(mathInterface)Naming.lookup(ServerURL); val=MI.div(i,j); t3.setText(""+val); } catch(Exception ex) { System.out.println("Exception:"+ex); } } public static void main(String args[]) { mathClient MC=new mathClient(); MC.setVisible(true); MC.setSize(600,500); };}SERVER.JAVAimport java.rmi.*;import java.rmi.Naming.*;import java.rmi.server.*;import java.rmi.registry.*;import java.net.*;import java.util.*;interface mathInterface extends Remote{ public int add(int a,int b) throws RemoteException; public int subt(int a,int b) throws RemoteException; public int mult(int a,int b) throws RemoteException; public int div(int a,int b) throws RemoteException;}class mathServer extends UnicastRemoteObject implements mathInterface{ public mathServer() throws RemoteException { System.out.println("Initializing Server"); } public int add(int a,int b) { return(a+b); } public int subt(int a,int b) { return(a-b); } public int mult(int a,int b) { return(a*b); }
  13. 13. public int div(int a,int b) { return(a/b); } public static void main(String args[]) { try { mathServer ms=new mathServer(); java.rmi.Naming.rebind("MathServ",ms); System.out.println("Server Ready"); } catch(RemoteException RE) { System.out.println("Remote Server Error:"+ RE.getMessage()); System.exit(0); } catch(MalformedURLException ME) { System.out.println("Invalid URL!!"); } }}OUTPUT –Q7. Write a program in java for reading a file from a designated URL.Solution: -I have used my drop-box account for accessing a file stored in my DROPBOX server.CODE –import java.io.BufferedInputStream;import java.io.InputStream;import java.io.InputStreamReader;import java.io.Reader;
  14. 14. import java.net.URL;class MainClass { public static void main(String[] args) throws Exception { URL u = new URL("https://dl.dropbox.com/u/94684259/Rajat.txt"); InputStream in = u.openStream(); in = new BufferedInputStream(in); Reader r = new InputStreamReader(in); int c; while ((c = r.read()) != -1) { System.out.print((char) c); } }}OUTPUT –Q8. Write a program in java implementing File input output functions.Solution: -CODE –import java.io.*;public class CopyFile{ private static void copyfile(String srFile, String dtFile) { try { File f1 = new File(srFile); File f2 = new File(dtFile);
  15. 15. InputStream in = new FileInputStream(f1); OutputStream out = new FileOutputStream(f2); byte[] buf = new byte[1024]; int len; while ((len = in.read(buf)) > 0) { out.write(buf, 0, len); } in.close(); out.close(); System.out.println("File copied."); } catch(FileNotFoundException ex) { System.out.println(ex.getMessage() + " in the specified directory."); System.exit(0); } catch(IOException e) { System.out.println(e.getMessage()); } } public static void main(String[] args) { switch(args.length) { case 0: System.out.println("File has not mentioned."); System.exit(0); case 1: System.out.println("Destination file has not mentioned."); System.exit(0); case 2: copyfile(args[0],args[1]); System.exit(0); default : System.out.println("Multiple files are not allow."); System.exit(0); } }}OUTPUT –Q9. Write a program in java implementing Java Beans.Solution: -Implementing a counter with JSP on a server for counting number of website views.CODE –COUNTERBEAN.JAVApackage form;public class CounterBean implements java.io.Serializable{ int coun = 0;
  16. 16. public CounterBean() { } public int getCoun() { coun++; return this.coun; } public void setCoun(int coun) { this.coun = coun; }}COUNTER.JSP<%@ page language="java" %><jsp:useBean id="counter" scope="session" class="form.CounterBean" /><HTML><HEAD><TITLE>Use Bean Counter Example</TITLE></HEAD><BODY><table><tr><td><b>The current count for the counter bean is: </b> <%=counter.getCoun() %></td></tr></table</BODY></HTML>OUTPUT –
  17. 17. Q10. Write a program in java implementing Swings.Solution: -CODE –import java.awt.*;import java.awt.event.*;import javax.swing.*;import javax.swing.text.html.*;public class bar{ final static int interval = 1000; int i; JLabel label; JProgressBar pb; Timer timer; JButton button; public bar() { JFrame frame = new JFrame("Progress Bar :: By - Rajat Suneja"); button = new JButton("Start"); button.addActionListener(new ButtonListener()); pb = new JProgressBar(0, 20); pb.setValue(0); pb.setStringPainted(true); label = new JLabel("Rajat Suneja"); JPanel panel = new JPanel(); panel.add(button); panel.add(pb); JPanel panel1 = new JPanel(); panel1.setLayout(new BorderLayout()); panel1.add(panel, BorderLayout.NORTH); panel1.add(label, BorderLayout.CENTER); panel1.setBorder(BorderFactory.createEmptyBorder(20, 20, 20, 20)); frame.setContentPane(panel1); frame.pack(); frame.setVisible(true); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); timer = new Timer(interval, new ActionListener() { public void actionPerformed(ActionEvent evt) { if (i == 20) {
  18. 18. Toolkit.getDefaultToolkit().beep(); timer.stop(); button.setEnabled(true); pb.setValue(0); String str = "<html>" + "<font color="#FF0000">" + "<b>" +"Downloading completed." + "</b>" + "</font>" + "</html>"; label.setText(str); } i = i + 1; pb.setValue(i); } }); } class ButtonListener implements ActionListener { public void actionPerformed(ActionEvent ae) { button.setEnabled(false); i = 0; String str = "<html>" + "<font color="#008000">" + "<b>" + "Downloadingis in process......." + "</b>" + "</font>" + "</html>"; label.setText(str); timer.start(); } } public static void main(String[] args) { bar spb = new bar(); }}OUTPUT -

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