1.Why does only one copy of a servlet object get created?
What happens if you want to remove an old servlet object
currently running but do not want to stop the entire
servlet engine?
2.How does one servlet object deal with interactions from
many browser? (e.g. if your servlet ran an email site, how
can it keep track of hundreds of users logging in, reading
their mail, etc.)
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plzzzzzzzzz xplain this code import java.awt.*; import java.awt.event.*; //import java.awt.MenuItem.*; public class MenuForm extends Frame implements ActionListener { MenuBar mb=new MenuBar(); Menu m1=new Menu("Master"); Menu m2 =new Menu("Transactions"); Menu m3=new Menu("Queries"); Menu m4=new Menu("Reports"); Menu m5=new Menu("Daily/Weekly"); Menu m6=new Menu("Housekeeping"); Menu m7=new Menu("About"); Menu m8=new Menu("Utilities/Tools"); Menu m9=new Menu("exit"); MenuItem m11=new MenuItem("consumer master"); MenuItem m12=new MenuItem(""); MenuItem m13=new MenuItem(""); MenuItem m21=new MenuItem("New Connection"); MenuItem m22=new MenuItem("Refill Booking"); MenuItem m23=new MenuItem("Shop Delivery"); MenuItem m51=new MenuItem("Mrk Dlry"); MenuItem m91=new MenuItem("Quit"); /*MenuItem m131=new MenuItem(" "); MenuItem m132=new MenuItem(" "); MenuItem m134=new MenuItem(" ");*/ Font f=new Font("TimesRoman",Font.BOLD,16); Frame f1; public static void main(String args[]) { new MenuForm().setVisible(true); } public MenuForm() { super("Gas Agency Main Menu"); setSize(1280,800); setBackground(Color.lightGray); setLayout(null); setMenuBar(mb); /*m1.setFont(new Font("TimesRoman", Font.BOLD,16)); m2.setFont(new Font("TimesRoman", Font.BOLD,16)); m3.setFont(new Font("TimesRoman", Font.BOLD,16));*/ mb.add(m1); mb.add(m2); mb.add(m3); mb.add(m4); mb.add(m5); mb.add(m6); mb.add(m7); mb.add(m8); mb.add(m9); m1.add(m11); m1.add(m12); m1.add(m13); m2.add(m21); m2.add(m22); m2.add(m23); m5.add(m51); m9.add(m91); //m3.add(m31); /*m13.setEnabled(false); m13.add(m131); m13.add(m132); m13.add(m133); m13.add(m134); m13.add(m135);*/ setVisible(true); /*m11.addActionListener(this); m12.addActionListener(this); m13.addActionListener(this); m2.addActionListener(this); m3.addActionListener(this);*/ m21.addActionListener(this); m22.addActionListener(this); m23.addActionListener(this); /*m31.addActionListener(this); m131.addActionListener(this); m132.addActionListener(this); m133.addActionListener(this); m134.addActionListener(this); m135.addActionListener(this);*/ m51.addActionListener(this); m91.addActionListener(this); } public void actionPerformed(ActionEvent e) { /*if(e.getSource()==m11) { } if(e.getSource()==m12) { } if( (e.getSource()==m131) || (e.getSource() ==m132) || (e.getSource()==m133) || (e.getSource()==m134) || (e.getSource()==m135) ) { }*/ if(e.getSource()==m21) { NewConnection nc=new NewConnection (); nc.setVisible(true); this.dispose(); } if(e.getSource()==m22) { RefillBooking rb=new RefillBooking (); rb.setVisible(true); this.dispose(); } if(e.getSource()==m23) { ShopDelivery sd=new ShopDelivery(); sd.setVisible(true); this.dispose(); } if(e.getSource()==m51) { MarkDelivery mrk=new MarkDelivery(); mrk.setVisible (true); this.dispose(); } if(e.getSource()==m91) { this.dispose(); System.exit(0); } } }
1.Why does only one copy of a servlet object get created? What happens if you want to remove an old servlet object currently running but do not want to stop the entire servlet engine? 2.How does one servlet object deal with interactions from many browser? (e.g. if your servlet ran an email site, how can it keep track of hundreds of users logging in, reading their mail, etc.)
Design a timer circuit using VHDL which has the following: input : start_timer(ST) output: long_time(LT) short_time(ST) when the timer is triggered by the ST(either 0 or 1) signal the timer should generate two timing signals accordingly.While the long time is going ON the other should be OFF and vice versa.
In LSMW , what does the following error mean and how to rectify it : Incorrect interface data for set 78 in method C . This error is occuring in idoc processing step of LSMW.
Write a program to Print the Pascal triangle
Write a program that will convert an integer pointer to an integer and vice-versa.
Write a Program to truncate a given floating point value (e.g.16.25=16).
I have multiple datasets and I have to search a particular string in all of them at a single time. Please suggest a full jcl or rexx tool for it.
Write a code snippet to display an integer in a binary format?
plzzzzzzzzz xplain this code import java.awt.*; import java.awt.event.*; import java.awt.MenuItem.*; import java.sql.*; import sun.jdbc.odbc.*; import java.io.*; public class ShopDelivery extends Frame implements ActionListener { Label l1,l2,l3,l4,l5,l6,l7,l8,l9,l10,l11,l12,l13; Button exit,save,next,top,prev,botm,ad,show; TextField txtCMemoNo,txtConsNo,txtCMemoDt,txtConsName,txtAddr1,txtPhNo ,txtBookDtold,txtPrintDt,txtOldCMemNo,txtOldDlryDt,adr2,adr3 ,tot,stnry,rmrk; String ConsName; String Addr1; public static void main(String sr[]) { new ShopDelivery().setVisible(true); } public ShopDelivery() { super("Shop Delivery"); Statement stmt; ResultSet rs; //PreparedStatement pst; Connection con; try { Class.forName ("sun.jdbc.odbc.JdbcOdbcDriver"); con=DriverManager.getConnection("jdbc:odbc:Agency"); if (con!=null); System.out.println ("connected"); stmt =con.createStatement (); } catch(Exception e1) { System.out.println (e1); } setSize(1280,800); setBackground(Color.CYAN); setLayout(null); l1=new Label("Cashmemo No"); l1.setBounds(260,60,90,30); l1.setFont(new Font ("TimesRoman",Font.PLAIN,15)); l1.setAlignment(Label.CENTER); add(l1); l2=new Label("CONSMR NO"); l2.setBounds(30,60,90,30); l2.setFont(new Font("TimesRoman",Font.PLAIN,15)); l2.setAlignment(Label.CENTER); add(l2); l3=new Label("Book DATE"); l3.setBounds(520,60,90,30); l3.setFont(new Font ("TimesRoman",Font.PLAIN,15)); l3.setAlignment(Label.CENTER); add(l3); l4=new Label("NAME"); l4.setBounds(30,150,45,30); l4.setFont(new Font ("TimesRoman",Font.PLAIN,15)); l4.setAlignment(Label.CENTER); add(l4); l5=new Label("ADRS"); l5.setBounds(30,220,45,30); l5.setFont(new Font ("TimesRoman",Font.PLAIN,15)); l5.setAlignment(Label.CENTER); add(l5); l6=new Label("PH NO"); l6.setBounds(500,150,45,30); l6.setFont(new Font ("TimesRoman",Font.PLAIN,15)); l6.setAlignment(Label.CENTER); add(l6); l7=new Label("OldBkDt"); l7.setBounds(30,390,55,30); l7.setFont(new Font ("TimesRoman",Font.PLAIN,15)); l7.setAlignment(Label.CENTER); add(l7); l8=new Label("Print Date"); l8.setBounds(320,390,65,30); l8.setFont(new Font("TimesRoman",Font.PLAIN,15)); l8.setAlignment(Label.CENTER); add(l8); l9=new Label("CMemo No"); l9.setBounds(700,390,65,30); l9.setFont(new Font ("TimesRoman",Font.PLAIN,15)); l9.setAlignment(Label.CENTER); add(l9); l10=new Label("Del Date"); l10.setBounds(550,390,55,30); l10.setFont(new Font ("TimesRoman",Font.PLAIN,15)); l10.setAlignment(Label.CENTER); add(l10); l13=new Label("REMARKS"); l13.setBounds (30,630,85,30); l13.setFont(new Font ("TimesRoman",Font.PLAIN,15)); l13.setAlignment (Label.CENTER); add(l13); txtCMemoNo=new TextField(); txtCMemoNo.setBounds(375,60,80,30); txtCMemoNo.setBackground(Color.white); add(txtCMemoNo); txtConsNo=new TextField(); txtConsNo.setBounds(130,60,80,30); txtConsNo.setBackground(Color.white); add(txtConsNo); txtCMemoDt=new TextField(); txtCMemoDt.setBounds(635,60,80,30); txtCMemoDt.setBackground(Color.white); add(txtCMemoDt); txtConsName=new TextField(); txtConsName.setBounds(100,150,200,30); txtConsName.setBackground(Color.white); add(txtConsName); txtAddr1=new TextField(); txtAddr1.setBounds(100,220,350,30); txtAddr1.setBackground(Color.white); add(txtAddr1); adr2=new TextField(); adr2.setBounds(100,250,350,30); adr2.setBackground(Color.white); add(adr2); adr3=new TextField(); adr3.setBounds(100,280,350,30); adr3.setBackground(Color.white); add(adr3); txtPhNo=new TextField(); txtPhNo.setBounds(570,150,150,30); txtPhNo.setBackground(Color.white); add(txtPhNo); txtBookDtold=new TextField(); txtBookDtold.setBounds(30,440,60,30); txtBookDtold.setBackground(Color.white); add(txtBookDtold); txtPrintDt=new TextField(); txtPrintDt.setBounds(320,440,60,30); txtPrintDt.setBackground(Color.white); add(txtPrintDt); txtOldCMemNo=new TextField(); txtOldCMemNo.setBounds(700,440,60,30); txtOldCMemNo.setBackground(Color.white); add(txtOldCMemNo); txtOldDlryDt=new TextField(); txtOldDlryDt.setBounds(550,440,60,30); txtOldDlryDt.setBackground(Color.white); add(txtOldDlryDt); rmrk=new TextField(); rmrk.setBounds(140,630,600,30); rmrk.setBackground(Color.white); add(rmrk); exit=new Button("EXIT"); exit.setBackground(Color.orange); exit.setBounds(760,700,40,40); exit.addActionListener(this); add(exit); save=new Button("SAVE"); save.setBackground(Color.orange); save.setBounds(715,700,40,40); save.addActionListener(this); add(save); next=new Button("NEXT"); next.setBackground(Color.orange); next.setBounds(90,700,40,40); next.addActionListener(this); add(next); top=new Button("TOP"); top.setBackground(Color.orange); top.setBounds(0,700,40,40); top.addActionListener(this); add(top); prev=new Button("PREV"); prev.setBackground(Color.orange); prev.setBounds(45,700,40,40); prev.addActionListener(this); add(prev); botm=new Button("BOTM"); botm.setBackground (Color.orange); botm.setBounds (135,700,40,40); botm.addActionListener (this); add(botm); ad=new Button("ADD"); ad.setBackground (Color.orange); ad.setBounds (300,700,40,40); ad.addActionListener (this); add(ad); show=new Button("SHOW"); show.setBackground (Color.orange); show.setBounds (345,700,40,40); show.addActionListener (this); add(show); } public void actionPerformed(ActionEvent e) { if(e.getSource()==exit) { this.dispose(); System.exit(0); } /*if(e.getSource()==save) { try { Connection con=DriverManager.getConnection("jdbc:odbc:Agency"); PreparedStatement pst=con.prepareStatement("INSERT INTO NewCon values (?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)"); pst.setInt (1,Integer.parseInt(txtConsNo.getText())); pst.setInt (2,Integer.parseInt(txtCMemoNo.getText())); pst.setString (3,txtCMemoDt.getText()); pst.setString (4,txtConsName.getText()); pst.setInt(5,Integer.parseInt (txtPhNo.getText())); pst.setString(6,txtAddr1.getText()); pst.setString(7,adr2.getText()); pst.setString(8,adr3.getText()); pst.setInt(9,Integer.parseInt (txtBookDtold.getText())); pst.setInt(10,Integer.parseInt (txtPrintDt.getText())); pst.setInt(11,Integer.parseInt (txtOldDlryDt.getText())); pst.setInt(12,Integer.parseInt (txtCMemoNo.getText())); pst.setInt(13,Integer.parseInt (tot.getText())); pst.setInt(14,Integer.parseInt (stnry.getText())); pst.setString(15,rmrk.getText()); pst.executeUpdate (); con.close(); } catch(Exception e2) {System.out.println(e2);} //cs(txtConsName.getText (),txtAddr1.getText()); }*/ if(e.getSource()==ad) { try { txtCMemoNo.setText(""); txtCMemoDt.setText(""); txtConsName.setText(""); txtAddr1.setText(""); txtPhNo.setText(""); txtBookDtold.setText(""); txtPrintDt.setText(""); //txtCMemoNo.setText(""); txtOldDlryDt.setText(""); adr2.setText(""); adr3.setText(""); tot.setText(""); //stnry.setText(""); //rmrk.setText(""); Connection con1=DriverManager.getConnection("jdbc:odbc:Agency"); Statement stmt1=con1.createStatement(); ResultSet rs1=stmt1.executeQuery("SELECT Max(Cons_No) FROM NewCon"); int nextcono = rs1.getInt ("Cons_No"); System.out.println (nextcono); nextcono=nextcono+1; txtConsNo.setText ("nextcono"); con1.close(); } catch(Exception e4){} } } }
Write a program that implements a date class containing day, month and year as data members. Implement assignment operator and copy constructor in this class.
plzzzzzzzzz xplain this code import java.awt.*; import java.awt.event.*; public class Link extends Frame implements ActionListener { Label l1; Button b1; public static void main(String sr[]) { new Link().setVisible(true); } public Link() { super("Warning"); setSize(500,500); setBackground(Color.lightGray); setLayout(null); l1=new Label("There is no Link"); l1.setBounds(0,0,500,460); l1.setFont(new Font("TimesRoman",Font.BOLD,35)); l1.setAlignment(Label.CENTER); add(l1); b1=new Button("QUIT"); b1.setBackground(Color.orange); b1.setBounds(0,460,500,40); b1.addActionListener(this); add(b1); } public void actionPerformed(ActionEvent e) { this.dispose(); } }