Group B
Q.no 3
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import java.awt.event.*; import java.awt.*; import javax.swing.*; public class Calculator extends JFrame implements ActionListener { JButton b10,b11,b12,b13,b14,b15; JButton b[]=new JButton[10]; int i,r,n1,n2; JTextField res; char op; public Calculator() { super("Calulator"); setLayout(new BorderLayout()); JPanel p=new JPanel(); p.setLayout(new GridLayout(4,4)); for(int i=0;i<=9;i++) { b[i]=new JButton(i+""); p.add(b[i]); b[i].addActionListener(this); } b10=new JButton("+"); p.add(b10); b10.addActionListener(this); b11=new JButton("-"); p.add(b11); b11.addActionListener(this); b12=new JButton("*"); p.add(b12); b12.addActionListener(this); b13=new JButton("/"); p.add(b13); b13.addActionListener(this); b14=new JButton("="); p.add(b14); b14.addActionListener(this); b15=new JButton("C"); p.add(b15); b15.addActionListener(this); res=new JTextField(10); add(p,BorderLayout.CENTER); add(res,BorderLayout.NORTH); setVisible(true); setSize(200,200); } public void actionPerformed(ActionEvent ae) { JButton pb=(JButton)ae.getSource(); if(pb==b15) { r=n1=n2=0; res.setText(""); } else if(pb==b14) { n2=Integer.parseInt(res.getText()); eval(); res.setText(""+r); } else { boolean opf=false; if(pb==b10) { op='+'; opf=true; } if(pb==b11) { op='-';opf=true;} if(pb==b12) { op='*';opf=true;} if(pb==b13) { op='/';opf=true;} if(opf==false) { for(i=0;i<10;i++) { if(pb==b[i]) { String t=res.getText(); t+=i; res.setText(t); } } } else { n1=Integer.parseInt(res.getText()); res.setText(""); } } } int eval() { switch(op) { case '+': r=n1+n2; break; case '-': r=n1-n2; break; case '*': r=n1*n2; break; case '/': r=n1/n2; break; } return 0; } public static void main(String arg[]) { new Calculator(); } } |
Q.no 4
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import java.sql.*; class Update { public static void main(String args[]) { try { Class.forName("com.mysql.jdbc.Driver"); Connection con=DriverManager.getConnection("jdbc:mysql://localhost:3306/College_db","root",""); Statement stmt=con.createStatement(); String query="update employees set salary=20000 where employee_id=6"; int i=stmt.executeUpdate(query); System.out.println(i+" records updated"); con.close(); } catch(Exception e) { System.out.println(e); } } } |
Q.no 5
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import java.io.*; import javax.servlet.*; import javax.servlet.http.*; public class OddEven extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html"); PrintWriter out = response.getWriter(); String n = request.getParameter("userName"); int num = Integer.parseInt(n); if (num % 2 == 0) { out.print("Even Number"); } else { out.print("Odd Number"); } out.close(); } } |
Q.no 6
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import java.awt.*; import java.awt.event.*; import javax.swing.*; public class SmallLarge extends JFrame implements ActionListener { JLabel l1,l2,l3; JTextField t1,t2; JButton b1,b2; public SmallLarge() { setLayout(new FlowLayout()); l1=new JLabel("Enter First Number"); l2=new JLabel("Enter Second Number"); l3=new JLabel("Result"); t1=new JTextField(10); t2=new JTextField(10); b1=new JButton("Small"); b2=new JButton("Large"); add(l1); add(t1); add(l2); add(t2); add(b1); add(b2); add(l3); b1.addActionListener(this); b2.addActionListener(this); } public void actionPerformed(ActionEvent ae) { int a=Integer.parseInt(t1.getText()); int b=Integer.parseInt(t2.getText()); if(ae.getSource()==b1) { if(a<b) { l3.setText("Smaller Number is "+a); } else { l3.setText("Smaller Number is "+b); } } else { if(a>b) { l3.setText("Larger Number is "+a); } else { l3.setText("Larger Number is "+b); } } } public static void main(String args[]) { SmallLarge sl=new SmallLarge(); sl.setSize(300,300); sl.setVisible(true); sl.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } } |
Q.no 7
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import java.awt.*; import java.awt.event.*; import javax.swing.*; public class KeyEventDemo extends JFrame implements KeyListener { JLabel l; int x = 0, y = 0; public KeyEventDemo() { setTitle("KeyEventDemo"); setSize(300, 300); setLayout(new FlowLayout()); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); l = new JLabel("Press any key on the keyboard"); add(l); addKeyListener(this); setVisible(true); } public void keyPressed(KeyEvent ke) { l.setText("You pressed: " + ke.getKeyChar()); if (ke.getKeyCode() == KeyEvent.VK_RIGHT) { x += 10; l.setLocation(x, y); } else if (ke.getKeyCode() == KeyEvent.VK_LEFT) { x -= 10; l.setLocation(x, y); } else if (ke.getKeyCode() == KeyEvent.VK_UP) { y -= 10; l.setLocation(x, y); } else if (ke.getKeyCode() == KeyEvent.VK_DOWN) { y += 10; l.setLocation(x, y); } } public void keyReleased(KeyEvent ke) { l.setText("You released: " + ke.getKeyChar()); } public void keyTyped(KeyEvent ke) { l.setText("You typed: " + ke.getKeyChar()); } public static void main(String[] args) { new KeyEventDemo(); } } |
Q.no 8
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*/ import java.io.*; import javax.servlet.*; import javax.servlet.http.*; import java.util.*; public class SimpleInterest extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html"); PrintWriter out = response.getWriter(); String title = "Simple Interest"; String docType = "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0 " + "Transitional//EN\">\n"; out.println(docType + "<HTML>\n" + "<HEAD><TITLE>" + title + "</TITLE></HEAD>\n" + "<BODY BGCOLOR=\"#FDF5E6\">\n" + "<H1 ALIGN=\"CENTER\">" + title + "</H1>\n" + "<UL>\n" + " <LI><B>Principal</B>: " + request.getParameter("principal") + "\n" + " <LI><B>Time</B>: " + request.getParameter("time") + "\n" + " <LI><B>Rate</B>: " + request.getParameter("rate") + "\n" + "</UL>\n" + "</BODY></HTML>"); } } |