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){}

}
}



}


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plzzzzzzzzz xplain this code import java.awt.*; import java.awt.event.*; import java.awt.MenuItem.*; import java.sql.*; import java.util.Date; import sun.jdbc.odbc.*; import java.io.*; public class RefillBooking 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 txtBookingNo,txtConsNo,txtBookingDt,txtConsName,txtAddr1,txt PhNo,txtBookDtold,txtPrintDt,txtCMemoNo,txtOldDlryDt,adr2,ad r3,tot,stnry,rmrk; Date date=new Date(); String ConsName; String Addr1; public static void main(String sr[]) { new RefillBooking().setVisible(true); } public RefillBooking() { super("Refill Booking"); 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.lightGray); setLayout(null); l1=new Label("Booking 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 (mm/dd/yyyy)"); l3.setBounds(520,60,190,30); 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); txtBookingNo=new TextField(); txtBookingNo.setBounds(375,60,80,30); txtBookingNo.setBackground(Color.white); add(txtBookingNo); txtConsNo=new TextField(); txtConsNo.setBounds(130,60,80,30); txtConsNo.setBackground(Color.white); add(txtConsNo); txtBookingDt=new TextField(); txtBookingDt.setBounds(750,60,80,30); txtBookingDt.setBackground(Color.white); add(txtBookingDt); 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); txtCMemoNo=new TextField(); txtCMemoNo.setBounds(700,440,60,30); txtCMemoNo.setBackground(Color.white); add(txtCMemoNo); 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) { int bkflag=1; try { Connection con=DriverManager.getConnection("jdbc:odbc:Agency"); PreparedStatement pst=con.prepareStatement("INSERT INTO RefillBooking VALUES (?,?,?,?)"); pst.setInt (1,Integer.parseInt(txtBookingNo.getText())); pst.setInt (2,Integer.parseInt(txtConsNo.getText())); pst.setString (3,txtBookingDt.getText()); pst.setInt(4,bkflag); /* pst.setString (4,txtConsName.getText()); pst.setString (6,txtAddr1.getText()); pst.setString(7,adr2.getText ()); pst.setString(8,adr3.getText ()); pst.setInt(9,Integer.parseInt (txtCylQty.getText())); pst.setInt (10,Integer.parseInt(txtCylDep.getText())); pst.setInt (11,Integer.parseInt(txtRegQty.getText())); pst.setInt (12,Integer.parseInt(txtRegDep.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);} } if(e.getSource()==show) { System.out.println("entered if body"); try { //to bring consumer's details Connection con2=DriverManager.getConnection("jdbc:odbc:Agency"); int consumer=Integer.parseInt (txtConsNo.getText()); PreparedStatement ps2=con2.prepareStatement("SELECT * FROM NewCon WHERE Cons_No=?"); ps2.setInt(1,consumer); ResultSet rs2= ps2.executeQuery(); while(rs2.next()) { System.out.print ("entered while"+rs2.getString(2)); txtConsName.setText (rs2.getString("Cons_Name")); txtAddr1.setText (rs2.getString("Adress1")); txtPhNo.setText (""+rs2.getInt("Ph_No")); adr2.setText (rs2.getString("Adress2")); adr3.setText (rs2.getString("Adress3")); rmrk.setText(""); } //Statement stmt3=con2.createStatement(); //ResultSet rs3=stmt3.executeQuery("SELECT CMemoNo,CMemo_Date,DeliveryDate FROM CashMemo where Cons_No="+consumer); con2.close(); } catch(Exception e2) {System.out.println(e2);} } if(e.getSource()==ad) { int newbkno=0; System.out.println("entered if body"); try { //to clear textboxes txtConsName.setText(""); txtAddr1.setText(""); txtBookingNo.setText(""); txtPhNo.setText(""); adr2.setText(""); adr3.setText(""); rmrk.setText(""); txtConsNo.setText(""); txtBookingDt.setText("" + date); txtBookDtold.setText(""); txtPrintDt.setText(""); txtCMemoNo.setText(""); txtOldDlryDt.setText(""); //to generate bookin no System.out.println("entered the try:"); Connection con1=DriverManager.getConnection("jdbc:odbc:Agency"); Statement stmt1=con1.createStatement(); ResultSet rs1=stmt1.executeQuery ("SELECT BookingNo FROM RefillBooking "); while(rs1.next()) { txtBookingNo.setText (""+rs1.getInt(1)); } newbkno=Integer.parseInt (txtBookingNo.getText()); System.out.println(newbkno); newbkno=newbkno+1; txtBookingNo.setText(""+newbkno); } catch(Exception e4){System.out.println(e4);} } } }

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