Week -1. Try debug step by step with small program of about 10 to 15 lines which contains at least one if else condition and a for loop.

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1 Week -1 Try debug step by step with small program of about 10 to 15 lines which contains at least one if else condition and a for loop. Java Code import java.util.scanner; public class TestPrime public static void main(string[] args) Scanner sc = new Scanner(System.in); System.out.println("Enter valid Number"); int n = sc.nextint(); int c = 0; for (int i = 1; i <= n; i++) if (n % i == 0) c++;

2 if (c == 2) System.out.println(n + "is Prime Number"); else System.out.println(n + "is not Prime Number"); Week - 2 Write a Java program that works as a simple calculator. Use a grid layout to arrange buttons for the digits and for the + * % operations. Add a text field to display the result. Handle any possible exceptions like divide by zero Java Code import java.awt.*; import java.awt.event.*; import java.applet.*; import javax.swing.*; /*

3 <applet code="cal" width=300 height=300> </applet> */ public class Cal extends JFrame implements ActionListener String msg=" "; int v1,v2,result; JTextField t1,t2; JButton b; boolean start = true; char OP; Cal() t1=new JTextField(25); t2=new JTextField(25); t1.seteditable(false); //setlayout(new BorderLayout());

4 add(t1, BorderLayout.NORTH); JPanel p = new JPanel(); p.setlayout(new GridLayout(4, 4)); String buttons = "789* /c="; for (int i = 0; i < buttons.length(); i++) b = new JButton(buttons.substring(i, i + 1)); b.addactionlistener(this); p.add(b); add(p, BorderLayout.CENTER); setsize(400,400); setvisible(true);

5 setdefaultcloseoperation(jframe.exit_on_close); public void actionperformed(actionevent ae) String str=ae.getactioncommand(); System.out.println("str="+str); char ch=str.charat(0); if ( Character.isDigit(ch)) if(start == true) t1.settext(str); else t1.settext(t1.gettext()+str);

6 start = false; else if(str.equals("+")) v1=integer.parseint(t1.gettext()); OP='+'; start = true; else if(str.equals("-")) v1=integer.parseint(t1.gettext()); OP='-'; start = true;

7 else if(str.equals("*")) v1=integer.parseint(t1.gettext()); OP='*'; start = true; else if(str.equals("/")) v1=integer.parseint(t1.gettext()); OP='/'; start = true; else if(str.equals("c")) t1.settext("");

8 else if(str.equals("=")) 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=='/') try

9 result=v1/v2; catch(arithmeticexception e) JOptionPane.showMessageDialog(null,"Should not divide by 0"); t1.settext(""+result); start = true; public static void main(string args[ ])

10 Cal c =new Cal(); Output: Week-3(a) Develop an applet in java that displays a simple message Java Code import java.applet.*; import java.awt.*;

11 /* <applet code="simpleapplet" height=300 width=300> </applet> */ public class SimpleApplet extends Applet public void paint(graphics g) g.setcolor(color.pink); setbackground(color.yellow); g.drawstring("hi APPLET Program",80,150);

12 Output:

13 Week - 3(b) Develop an applet in java that receives an integer in one text field, and computes its factorial value and returns it in another text field, when the button named compute is clicked. Java Code import java.applet.*; import java.awt.*; import java.awt.event.*; /**<applet code=fact width=500 height=500> </applet>*/ public class Fact extends Applet implements ActionListener

14 Button b1,b2; Label l1,l2; TextField t1,t2; public void init() l1=new Label("NUMBER"); t1=new TextField(20); l2=new Label("RESULT"); t2=new TextField(20); b1=new Button("COMPUTE"); b1.addactionlistener(this); b2=new Button("CLEAR"); b2.addactionlistener(this);

15 add(l1); add(t1); add(l2); add(t2); add(b1); add(b2); public void actionperformed(actionevent e) if(e.getsource()==b1) int n=integer.parseint(t1.gettext()); int fact=1; for(int i=1;i<=n;i++) fact*=i; t2.settext(integer.tostring(fact)); else if(e.getsource()==b2)

16 t1.settext(""); t2.settext(""); Output:

17 Week- 4 Write a program that creates a user interface to perform integer divisions. The user enters two numbers in the textfields, Num1 and Num2. The division of Num1 and Num2 is displayed in the Result field when the Divide button is clicked. If Num1 or Num2 were not an integer, the program would throw a NumberFormatException. If Num2 were Zero, the program would throw an ArithmeticException Display the exception in a message dialog box. Java Code import java.applet.*;

18 import java.awt.*; import java.awt.event.*; import javax.swing.*; public class Division extends JFrame implements ActionListener JButton b1,b2; JLabel l1,l2,l3; JTextField tf1,tf2,tf3; Division() l1=new JLabel("Enter the Numerator"); tf1=new JTextField(15); l2=new JLabel("Enter the Denaminator"); tf2=new JTextField(15); b1=new JButton("DIVIDE"); b1.addactionlistener(this);

19 l3=new JLabel("RESULT"); tf3=new JTextField(15); setlayout(new FlowLayout()); add(l1); add(tf1); add(l2); add(tf2); add(l3); add(tf3); add(b1); setsize(400,400); setvisible(true); setdefaultcloseoperation(jframe.exit_on_close);

20 public void actionperformed(actionevent e) if(e.getsource()==b1) try int num1=integer.parseint(tf1.gettext()); int num2=integer.parseint(tf2.gettext()); int result=num1/num2; tf3.settext(integer.tostring(result)); catch(arithmeticexception ex) JOptionPane.showMessageDialog(null, "ArithmeticException: divide by zero"); catch(numberformatexception ex)

21 JOptionPane.showMessageDialog(this,"NumberFormatExc eption"); public static void main(string args[]) Division b=new Division(); Output:

23 Week- 5 Write Java Program that implements a multithread application that has three threads. First Thread generates random integer for every second and if the value is even, second thread computes The square of number and prints. If the value is odd, the third thread will print the value of cube of number. Java Code import java.util.*; class even implements Runnable public int x; even(int x) this.x = x;

24 public void run() + x + "is System.out.println("Threa Name: Even Thread and " even Number and Square of " + x +" is: " + x * x); class odd implements Runnable public int x; public odd(int x) this.x = x; public void run()

25 + x + " is System.out.println("Thread Name:ODD Thread and " odd number and Cube of " + x + "is: " + x * x * x); class A extends Thread String tname; Thread t1, t2; public void run() int num = 0; Random r = new Random(); try for (int i = 0; i < 5; i++)

26 num = r.nextint(20); System.out.println("Main Thread and Generated Number is " + num); if (num % 2 == 0) else t1 = new Thread(new even(num)); t1.start(); t2 = new Thread(new odd(num)); t2.start(); Thread.sleep(1000); "); System.out.println(" catch (Exception ex)

27 System.out.println(ex.getMessage()); public class MultiThread public static void main(string[] args) A a = new A(); a.start(); Output:

29 Week-6 Write a java program that connects to a database using JDBC and does add, delete, modify and retrieve operations Java Code import java.sql.*; class DBOperations public static void main(string args[])throws Exception Class.forName("oracle.jdbc.driver.OracleDriver"); Connection con=drivermanager.getconnection("jdbc:oracle:thin:@localhos t:1521:xe","system","cmrec"); Statement stmt=con.createstatement(); // insert data into emp1 table stmt.executeupdate("insert into emp1 values(33,'sita')"); stmt.executeupdate("insert into emp1 values(34,'gita')"); stmt.executeupdate("insert into emp1 values(35,'rita')");

30 // update emp1 table int result=stmt.executeupdate("update emp1 set ename='mala' where eno=33"); System.out.println(result+"records updated"); //delete from emp1 table result=stmt.executeupdate("delete from emp1 where eno=33"); System.out.println(result+"records deleted"); //retrieving from emp1 table ResultSet rs = stmt.executequery("select * from emp1"); while(rs.next()) System.out.println(rs.getInt(1)+" \t "+rs.getstring(2)); con.close(); Output:

31 Week - 7 Write a java program that simulates a traffic light. The program lets the user select one of three lights: red, yellow, or green with radio buttons. On selecting a button, an

32 appropriate message with stop or ready or go should appear above the buttons in selected color. Initially there is no message shown. Java Code import java.awt.*; import java.awt.event.*; import java.applet.*; import javax.swing.*; /*<applet code="radiotraffic.class" width=400 height=400></applet>*/ public class RadioTraffic extends Applet implements ActionListener int colournum; ButtonGroup bg; JRadioButton red, yellow,green;

33 String msg=" "; public void init () bg=new ButtonGroup(); red=new JRadioButton("RED"); yellow=new JRadioButton("YELLOW"); green=new JRadioButton("GREEN"); bg.add(red); bg.add(yellow); bg.add(green); add(red); add(yellow);

34 add(green); red.addactionlistener(this); yellow.addactionlistener(this); green.addactionlistener(this); public void actionperformed(actionevent ie) if (red.isselected()) colournum = 1; else if (yellow.isselected()) colournum = 2; else colournum = 3; repaint ();

35 public void paint (Graphics g) // responsible for graphics "within" the window g.setcolor(color.black); g.filloval (150, 70, 50, 50); // red light g.filloval (150, 150, 50, 50); // yellow light g.filloval (150, 230, 50, 50); // green light switch (colournum) case 1:g.setColor (Color.red); g.filloval (150,70,50,50); // red light msg="stop"; g.drawstring(msg,210,100); break; case 2:g.setColor(Color.yellow); g.filloval (150,150,50,50); // yellow light

36 msg="ready"; g.drawstring(msg,210,180); break; case 3:g.setColor(Color.green); g.filloval (150,230,50,50); // green light msg="go"; g.drawstring(msg,210,260); break; Output:

37 Week-8 Write a java program to create an abstract class named Shape that contains two integers and an empty method named printarea(). Provide three classes named Rectangle, Triangle, and Cirlce such that each one of the classes extends the class Shape. Each one of the classes contains only the method printarea() that prints the area of the given shape. Java Code abstract class Shape

38 int len,bre; abstract void printarea(); class Rectangle extends Shape int hei; Rectangle(int l,int b,int h) len=l; bre=b; hei=h; void printarea() System.out.println("area of rectangle"+len*bre*hei);

39 class Triangle extends Shape Triangle(int l,int b) len=l; bre=b; void printarea() System.out.println("area of triangle"+0.5*len*bre); class Circle extends Shape Circle(int r) len=r;

40 void printarea() System.out.println("area of circle"+3.14*len*len); class ShapeDemo public static void main(string args[]) Rectangle r=new Rectangle(2,3,6); Triangle t=new Triangle(4,6); Circle c=new Circle(2); Shape d; d=r; d.printarea(); d=t; d.printarea(); d=c;

41 d.printarea(); Output: Week -9 Suppose that a table named Table.txt is stored in a text file. The First line in the file is the header, and the remaining lines correspond rows in table. The elements are separated by commas.

42 Write java program to display the table using Label in Grid Layout. Java Code import java.io.*; import java.util.*; import java.awt.*; import java.awt.event.*; import javax.swing.*; class Display extends JFrame public Display() GridLayout g = new GridLayout(0, 3); setlayout(g); try BufferedReader br = new BufferedReader(new FileReader("emp.txt"));

43 String line; while ((line = br.readline())!= null) String datavalue[] = line.split(","); for (int i = 0; i< datavalue.length;i++) add(new JLabel(datavalue[i])); catch (Exception e) System.out.println(e); setsize(400, 400); setvisible(true);

44 setdefaultcloseoperation(jframe.exit_on_close); public class Tbl public static void main(string[] args) Display d = new Display(); Input:

45 Output:

46 Week - 10 Write a java program that handles all mouse events and shows the event name at the center of the window when a mouse event is fired. Java Code import java.awt.*; import java.awt.event.*; import java.applet.*; /* <applet code="mouseevents" width=300 height=100> </applet> */ public class MouseEvents extends Applet implements MouseListener, MouseMotionListener String msg = ""; int mousex = 0, mousey = 0; // coordinates of mouse public void init()

47 addmouselistener(this); addmousemotionlistener(this); // Handle mouseclick event public void mouseclicked(mouseevent me) mousex = 0; mousey = 10; msg = "Mouse clicked."; repaint(); // Handle mouse entered event. public void mouseentered(mouseevent me) mousex = 0;

48 mousey = 10; msg = "Mouse entered."; repaint(); // Handle mouse exit event public void mouseexited(mouseevent me) mousex = 0; mousey = 10; msg = "Mouse exited."; repaint(); // Handle mouse pressed. public void mousepressed(mouseevent me) mousex = me.getx(); mousey = me.gety(); msg = "Down";

49 repaint(); // Handle mouse released. public void mousereleased(mouseevent me) mousex = me.getx(); mousey = me.gety(); msg = "Up"; repaint(); // Handle mouse dragged. public void mousedragged(mouseevent me) mousex = me.getx(); mousey = me.gety(); msg = "*"; showstatus("dragging mouse at " + mousex + ", " + mousey); repaint();

50 // Handle mouse moved. public void mousemoved(mouseevent me) showstatus("moving mouse at " + me.getx() + ", " + me.gety()); // Display msg in applet window at current X,Y location. public void paint(graphics g) Output: g.drawstring(msg, mousex, mousey);

$record are separated by a tab(\t).$

51 Week-11 Write a java program that loads names and phone numbers from a text file where the data is organized as one line per record and each field in a record are separated by a tab(\t). It takes a name or phone number as input and prints the corresponding other value from the hash table ( hint : use Hashtable)

52 Java Code import java.util.*; import java.io.*; class PhoneFromText public static void main(string args[]) throws Exception BufferedReader br = new BufferedReader(new FileReader("phoneno.txt")); Scanner sc=new Scanner(System.in); Hashtable<String,String> hs= new Hashtable<String,String> (); String line; while ((line = br.readline())!= null) String datavalue[] = line.split("\t"); String value1 = datavalue[0]; String value2 = datavalue[1];

53 hs.put(value1,value2); System.out.println("Names of phone directory are :"); Enumeration e = hs.keys(); while(e.hasmoreelements()) System.out.println(e.nextElement()); System.out.print("Enter any name:"); String name = sc.next(); name.trim(); System.out.println(name +" " + "phone no=" + hs.get(name)); Input: br.close();

54 Output: Week -12 implement week -11 program with database instead of text file Java Code import java.util.*; import java.sql.*; import java.io.*; class PhoneFromDatabase

55 public static void main(string args[]) try Class.forName("oracle.jdbc.driver.OracleDriver"); Connection con=drivermanager.getconnection( Statement stmt=con.createstatement(); phone"); ResultSet rs=stmt.executequery("select * from Hashtable<String,String> hs= new Hashtable<String,String> (); while(rs.next()) String value1 = rs.getstring(1); String value2 = rs.getstring(2); hs.put(value1,value2);

56 //System.out.println(rs.getString(1)+" "+rs.getstring(2)); System.out.println("Names of phone directory are :"); Enumeration e = hs.keys(); while(e.hasmoreelements()) System.out.println(e.nextElement()); Scanner sc = new Scanner(System.in); System.out.print("enter any name:"); String name = sc.next(); name.trim(); System.out.println(name +" " + "phone no="+hs.get(name)); con.close(); catch(exception e)

57 System.out.println(e); Output:

59 Week - 13 Write a java program that takes tab seperated data from (one record per line) from a text file and inserts them into database Java Code import java.sql.*; import java.io.*; class TabSeperatedDatabase public static void main(string args[]) try Class.forName("oracle.jdbc.driver.OracleDriver"); Connection con=drivermanager.getconnection( "jdbc:oracle:thin:@localhost:1521:xe","system","cmrec"); Statement stmt=con.createstatement();

60 PreparedStatement ps=con.preparestatement("insert into emp values(?,?,?)"); BufferedReader br = new BufferedReader(new FileReader("phoneno.txt")); String line; while ((line = br.readline())!= null) String datavalue[] = line.split("\t"); String value1 = datavalue[0]; String value2 = datavalue[1]; ps.setint(1,value1); ps.setstring(2,value2); ps.executeupdate(); phone"); ResultSet rs=stmt.executequery("select * from while(rs.next())

61 System.out.println(rs.getString(1)+" "+rs.getstring(2)); con.close(); catch(exception e) System.out.println(e); Output:

62 Week 14: Write a java program that prints the meta-data of a given table. Java Code import java.sql.*; import java.util.stringtokenizer; public class TableMetaData final static String table = "emp"; public static void main(string[] args) System.out.println("--- meta data ---"); try Class.forName("oracle.jdbc.driver.OracleDriver"); Connection con=drivermanager.getconnection( "jdbc:oracle:thin:@localhost:1521:xe","system","cmrec"); Statement stmt=con.createstatement();

63 ResultSet rs = stmt.executequery("select * FROM "+ table); ResultSetMetaData rsmd = rs.getmetadata(); int columncount = rsmd.getcolumncount(); for(int col = 1; col <= columncount; col++) System.out.print(rsmd.getColumnLabel(col)); System.out.print(" (" + rsmd.getcolumntypename(col)+")"); if(col < columncount) System.out.print(", "); System.out.println(); while(rs.next()) for(int col = 1; col <= columncount; col++)

64 System.out.print(rs.getString(col)); System.out.print("\t"); System.out.println(); rs.close(); stmt.close(); con.close(); catch (Exception e) class"); System.out.println("Unable to load database driver Output:

SIDDHARTHA Institute of Engineering and Technology

SIDDHARTHA Institute of Engineering and Technology Department of Computer Science &Engineering JAVA Programming Lab Manual [Subject Code: A40585] For the Academic year 2015-16 II B Tech II Semester List