Ex.No.1 Quadratic Equation
Aim: To print all Real Solutions to the quadratic
equation.
Algorithm:
Step 1:
Start
Step 2:
Declare the variables for 3 values as in ax2+bx+c=0
Step 3: Get
the input from the user for the 3 values
Step 4:
Process the equation by the formulae:
b2-4ac
which is the discriminate
if
discriminate is = 0, then x1=x2=-b/(2*a) and display “Roots are Real &
equal”
if
discriminate is >0,then
x1=(-b+Math.sqrt(disc))/(2*a); and x2=(-b-Math.sqrt(disc))/(2*a);
and display
“Roots are Real & unequal”
else display
“No real Solutions”
Step 5: Stop
/* Quadratic Equation */
import java.io.*;
class
Quadratic
{
public
static void main(String args[]) throws IOException
{
double x1,x2,disc, a,b,c;
InputStreamReader
obj=new InputStreamReader(System.in);
BufferedReader
br=new BufferedReader(obj);
System.out.println("Enter
a,b,c Values");
a=Double.parseDouble(br.readLine());
b=Double.parseDouble(br.readLine());
c=Double.parseDouble(br.readLine());
disc=(b*b)-(4*a*c);
if(disc==0)
{
System.out.println("Roots
are real and equal");
x1=x2=-b/(2*a);
System.out.println("Roots
are"+x1+","+x2);
}
else
if(disc>0)
{
System.out.println("Roots
are real and unequal");
x1=(-b+Math.sqrt(disc))/(2*a);
x2=(-b-Math.sqrt(disc))/(2*a);
System.out.println("Roots
are"+x1+","+x2);
}
else
{
System.out.println("There
are no real solutions");
}
}
}
Output:
Enter a,b,c
Values
6 8 4
There are no
real solutions
Enter a,b,c
Values
5 15 6
Roots are
real and unequal
Roots are -0.4753049234040402,-2.5246950765959597
Enter a,b,c
Values
1 -4 4
Roots are
real and equal
Roots are
2.0,2.0
Ex.no.2(a) Fibonacci Series – Non recursive
Aim: To
write a program that uses non recursive function to print the nth value in the
Fibonacci sequence.
Algorithm:
Step 1:
Start
Step 2:
Initialize and assign the variables
Step 3: The
first two values in the sequence are 1 & 1
Step 4: Start printing from first two values and find
the sum of preceding two values for next
value and print & vice versa by exchanging their values
Step 5: Stop
Fibonacci
Series – Non recursive */
class
fibonacci
{
public
static void main(String args[])
{
int num =
Integer.parseInt(args[0]);
System.out.println("*********Fibonacci
Series*****");
int
f1,f2=0,f3=1;
for(int
i=1;i<=num;i++)
{
System.out.print("
"+f3+" ");
f1=f2;
f2=f3;
f3=f1+f2;
}
}
}
Output:
*********Fibonacci
Series*****
1
1 2
3 5 8 13 21
34 55
Ex. no.2(b) Fibonacci Series–
Recursive
Aim : To
write a program that uses recursive function to print the nth value in the
Fibonacci sequence.
Algorithm:
Step 1:
Start
Step 2:
Initialize the variables
Step 3: Get
input from the user till which number the Fibonacci series is to be printed
Step 4: if the number =0 &1 return the number
else return the Fibonacci number using recursion.
Step 5:
Start printing from current item and then increase the counter and return
preceding item
Step 6:
Repeat step 5 until the counter reaches the maximum number
Step 7:
Display the Fibonacci series
Step 8: Stop
/* Fibonacci Series – Recursive */
import
java.io.*;
public class
fibnum{
public
static long FibonacciMethod(long number){
if((number==0)||
(number ==1))
return
number;
else
return
FibonacciMethod(number -1)+FibonacciMethod(number-2);
}
public
static void main(String[]args){
try{
BufferedReader
dis=new BufferedReader(new InputStreamReader(System.in));
System.out.print("Enter
How many number you want in series:");
int
Number=Integer.parseInt(dis.readLine());
System.out.print("Fibonacci
Series:");
for(int
counter=1;counter<=Number;counter++)
{
System.out.print(FibonacciMethod(counter));
System.out.print("
");
}}
catch(Exception
e){
System.out.println(e);
}
}
}
Output:
Enter How
many number you want in series:10
Fibonacci
Series:1 1 2 3 5 8 13 21 34 55
Ex. No. 3(a)Print all prime numbers
up to given Integer
Aim: To
print out all the prime numbers in a series up to the given integer range.
Algorithm:
Step 1:
Start
Step 2:
Initialize the variables
Step 3: Get
the input from the user till which range the prime numbers to be printed in a
series
Step 4:
Check the number if it is prime or not by “modulus”
if the
remainder is zero, skip the element
else return
the number
Step 5:
Repeat the step 4 until the input range is reached
Step 6: Stop
/* Print all prime numbers up to
given Integer */
import
java.io.*;
class prime
{
public
static void main(String args[])throws IOException
{
int i;
BufferedReader
bf=new BufferedReader(new InputStreamReader(System.in));
System.out.println("Enter
the number till which the prime numbers has to
be printed:");
int
num=Integer.parseInt(bf.readLine());
System.out.println("*****Prime
Numbers*****");
for(i=1;i<num;i++)
{
int j;
for(j=2;j<i;j++)
{
int n=i%j;
if(n==0)
{
break;
}
}
if(i==j)
{
System.out.print("
"+i);
}
}
}
}
Output:
Enter the
number till which the prime numbers has to printed:
60
*****Prime
Numbers*****
2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59
Ex. No: 3(b) Matrix Multiplication
Aim: To
implement matrix multiplication and print the elements
Algorithm:
Step 1:
Start
Step 2:
Initialize the variables and input the user’s choice
Step 3: Get the number of rows and columns
Step 4:
Using the strategy - check if the two
matrices are square matrices
Step 5:
Multiply the first row of first matrix with the first column of second matrix
Step 6:
Repeat the step 5 for all the rows
Step 7:
Display the resultant matrix
Step 8: Stop
/*Matrix Multiplication */
import
java.lang.*;
import
java.io.*;
class
arraymul
{
public
static void main(String args[])throws IOException
{
BufferedReader
br=new BufferedReader(new InputStreamReader(System.in));
System.out.print("Enter
# of rows");
int
m=Integer.parseInt(br.readLine());
System.out.print("Enter
the # of columns");
int
n=Integer.parseInt(br.readLine());
int
a[][]=new int[m][n];
int i,j,k;
System.out.println("Enter
First Matrix");
for(i=0;i<m;i++)
{
for(j=0;j<n;j++)
{
a[i][j]=Integer.parseInt(br.readLine());
}
}
System.out.print("Enter
the # of Rows");
int
p=Integer.parseInt(br.readLine());
System.out.print("Enter
the # of Columns");
int
q=Integer.parseInt(br.readLine());
int
b[][]=new int[p][q];
System.out.println("Enter
Second Matrix");
for(i=0;i<p;i++)
{
for(j=0;j<q;j++)
{
b[i][j]=Integer.parseInt(br.readLine());
}
}
int
c[][]=new int[m][i];
if(n==p)
{
for(i=0;i<m;i++)
{
for(j=0;j<q;j++)
{c[i][j]=0;
for(k=0;k<p;k++)
{
c[i][j]=c[i][j]+(a[i][k]*b[k][j]);
}
}
}
System.out.println("****Resultant
Matrix is:****\n");
for(i=0;i<m;i++)
{
for(j=0;j<q;j++)
{
System.out.print(c[i][j]);
System.out.print("\t");
}
System.out.println("
");
}
}
}
}
Output:
Enter # of
rows: 2
Enter the #
of columns: 2
Enter First
Matrix
5 5
6 6
Enter the #
of Rows: 2
Enter the #
of Columns: 2
Enter Second
Matrix
12 32
5 2
****Resultant
Matrix ****
85 170
102 204
Ex. No. 3( c) Sum of all the Integers
Aim: To read line of integers and display them
along with the sum of integers using String Tokenizer class of java.util
Algorithm:
Step 1:
Start
Step 2: Get
the input from the user
Step 3:
Count the tokens one by one using
StringTokenizer() class of java.util
Step 4:
Return the sum using “hasMoreTokens()”
Step5: Print
the sum of all integers
Step 6: Stop
/* Sum of all the Integers */
import
java.io.*;
import
java.util.*;
class
jtokens{
public
static void main (String ar[]) throws Exception{
InputStreamReader
isr= new InputStreamReader(System.in);
BufferedReader
br=new BufferedReader (isr);
System.out.println("Enter
Numbers");
String
S=br.readLine();
int sum=0;
StringTokenizer
st=new StringTokenizer (S," ");
System.out.println("The
Given Numbers :");
while
(st.hasMoreTokens ()){
String sl=
st.nextToken();
int n=
Integer.parseInt (sl);
System.out.println(n);
sum=sum+n;
}
System.out.println("The
Sum of all Integers:");
System.out.println(sum);
}
}
Output:
Enter
Numbers:
1 2 3 6 5 4
9 8 7
The Given
Numbers :
1 2 3
6 5 4 9 8 7
The Sum of
all Integers:
45
Ex.No. 3(d) Palindrome (String )
Aim: To
check whether the given string is a palindrome or not
Algorithm:
Step 1:
Start
Step2: Get
the string to be checked
Step 3:
Check if the first character is equal to the last character in the string
Step 4: If
it is not equal display “ Not a Palindrome” and go to step 8
Step 5: If
it is equal check the next element with the next last element
Step 6:
Repeat the step 4 and 5 until all the elements in the string are checked
Step7: If
all the elements are equal to each other till the middle character,
display “The given String is a
Palindrome”
Step 8: Stop
/* Palindrome (String ) */
import
java.io.*;
class
palindrome{
public
static void main(String args[])throws IOException
{
BufferedReader
br=new BufferedReader(new InputStreamReader(System.in));
System.out.println("Enter
String");
String
str=br.readLine();
StringBuffer
sb=new StringBuffer(str).reverse();
String
strRev=sb.toString();
if(str.equalsIgnoreCase(strRev))
{
System.out.println("Given
String is palindrome");
}
else{
System.out.println("Given
String is not a palindrome");
}
}
}
Output:
Enter String
Mam
Given String
is palindrome
Enter String
Java
Given String
is not a palindrome
Ex.No. 4 (a) Sorting(String)
Aim: To Sort a given list of names in ascending/alphabetical
order
Algorithm:
Step 1:
Start
Step 2: Get
the # of Strings as input
Step3: Read
all the strings one by one and store it in a string array
Step4:
Repeat step3 until it reaches the # last element count
Step5: Using
compareTo() function, compare the elements and return the sorted array
Step6: Print
the Sorted array
Step7: Stop
/* Sorting
(String) */
import
java.lang.*;
import
java.io.*;
public class
sorting{
public
static void main(String args[])throws IOException
{
BufferedReader
br=new BufferedReader(new InputStreamReader(System.in));
System.out.print("Enter
how many strings to be sorted");
int
n=Integer.parseInt(br.readLine());
String
x[]=new String[n];
System.out.println("Enter
the "+n+"Strings");
for(int
i=0;i<n;i++)
{
x[i]=br.readLine();
}
String s=new
String();
for(int
i=0;i<n;i++)
{
for(int
j=0;j<n;j++)
{
if(x[i].compareTo(x[j])<0)
{
s=x[i];
x[i]=x[j];
x[j]=s;
}
}
}
System.out.println("*****String
in alphabetical order*****\n");
for(int
i=0;i<n;i++)
{
System.out.println(x[i]);
}
}
}
Output:
Enter the
10Strings
alpha
omega
gamma
thero
nero
opera
jack
jill
french
oil
*****String
in alphabetical order*****
alpha
french
gamma
jack
jill
nero
oil
omega
opera
thero
Ex.No.4(b) File Information
Aim: To read
a file name from the user and display its information whether it exists,
writable, its type and its length in bytes.
Algorithm:
Step1: Start
Step2: Using
‘File’ command get the filename with its location from the user
Step3: If
the file exists, display” File Exists” else “Not Exists”
Step4: If
the file is readable, display”File is readable” else “Not Readable”
Step5: If
the file is writable, diplay “File is Writable” else “Not Writable”
Step6:
Display its location on the disk
Step7:
Display its length in bytes
Step8: Stop
Note: Run
the program using the following command
java filename d:\bca\filename.java
/* File Information */
import
java.io.*;
class
fileinfo
{
public
static void main(String ar[])
{
File f1 =
new File("e:/BCA/fileinfo.java");
System.out.println(f1.exists());
System.out.println(f1.canRead());
System.out.println(f1.canWrite());
System.out.println(f1.isFile());
System.out.println(f1.isDirectory());
System.out.println(f1.length());
}
}
Output:
E:\BCA>java
fileinfo E:BCA\palindrome.java
false
false
false
false
false
0
E:\BCA>javac
fileinfo.java
E:\bca>java
fileinfo E:BCA\fileinfo.java
true
true
true
true
false
347
Ex.No. 4 ( c) Line
Number before each Line
Aim: To read
a file and display it on the screen with a line number before each line
Algorithm :
Step1: Start
Step2: In
the ‘try’ block using LineNumberReader() get the line number and store it in an
array
Step3: Print
the previously stored line number adding up the text line by line using
thisLine
Step4: Repeat
the process till the control reaches the last string count
Step5: In
the ‘catch’ block , I/O exception display the “Error”
Step6: Stop
Note: Run
the program using the following command
java filename d:\bca\filename.java
/* Line Number before each Line */
import
java.io.*;
class linum
{
public
static void main(String args[])
{
String
thisline;
for(int
i=0;i<args.length;i++)
{
try
{
LineNumberReader
br=new LineNumberReader(new FileReader(args[i]));
while((thisline=br.readLine())!=null)
{
System.out.println(br.getLineNumber()+"."+thisline);
}
}
catch(IOException
e)
{
System.out.println("error:"+e);
}
}
}
}
Output: E:\BCA>java linum E:BCA\linum.java
1.import
java.io.*;
2.class
linum
3.{
4.public
static void main(String args[])
5.{
6.String
thisline;
7.for(int
i=0;i<args.length;i++)
8.{
9.try
10.{
11.LineNumberReader
b=new LineNumberReader(new FileReader(args[i]));
12.while((thisline=b.readLine())!=null)
13.{
14.System.out.println(b.getLineNumber()+"."+thisline);
15.}
16.}
17.catch(IOException
e)
18.{
19.System.out.println("error:"+e);
20.}
21.}
22.}
23.}
Ex.No.4(d) Number of characters, lines and words in
a Text File
Aim: To
display # of characters, lines & words in a text file
Algorithm:
Step1: Start
Step2:
Initialize the variables and counter to 0
Step3: While
the input line = NULL, increment by1 & add it to previous index value
Step4:
Repeat step3, until value equals to zero
Step5: While
input is less than length(), add whitespace
Step6:
Finally add them both and print the result
Step7: Stop
Note: Run
the program using the following command
java filename d:\bca\filename.java
/* Number of characters, lines and
words in a text file*/
import
java.io.*;
public class
newclass
{
public
static void main(String args[])throws IOException
{
long
n=0,nw=0, nc=0;
String line;
BufferedReader
br=new BufferedReader(new FileReader(args[0]));
while((line=br.readLine())!=null)
{
n++;
nc=nc+line.length();
int i =0;
boolean
pspace=true;
while(i<line.length())
{
char
c=line.charAt(i++);
boolean
space=Character.isWhitespace(c);
if(pspace&&!space)
nw++;
pspace=space;
}
}
System.out.println("Number
of characters"+nc);
System.out.println("Number
of words"+nw);
System.out.println("Number
of lines"+n);
}
}
Output:
E:\BCA>java
newclass E:\BCA\newclass.java
Number of
characters532
Number of
words53
Number
of lines28
Ex.no. 5 Shopping List Using Vector
Aim: To
accept a shopping list of 5 items from the command line and store them in a
vector and accomplish to add an item at specific location, at the end, to
delete an item, to print the contents of the vector in a hierarchical order
Algorithm:
Step1: Start
Step2: Initialize vector list and its relevant
variables to accept the list of items
Step3: Using
addElement() class of java.util add each element to the string array
Step4: Give
the choice to the user, whether to add, delete or print the array
If it is
add, add the element using insertElementAt()
If it is to
delelte, delete the item using removeElement()
If it is to
add at the end of the location, use addElement()
To print use
vectorlist, elementAt()
Step5: Stop
/* Shopping List Using Vector */
import
java.util.*;
import
java.io.*;
class
menudriven
{
public
static void main(String args[])
{
Vector
itemList = new Vector();
String
str,item;
int
i,j,len,choice,pos;
len=args.length;
for(i=0;i<len;i++)
itemList.addElement(args[i]);
while(true)
{
System.out.println("\n\n*****Shopping
List*****\n");
System.out.println("Enter
your Choice");
System.out.println("1.Add
Item at the specified Location");
System.out.println("2.Add
Item at the end of the list");
System.out.println("3.Print
Vector List");
System.out.println("4.Delete
Item");
System.out.println("5.Exit");
System.out.flush();
try{
BufferedReader
obj= new BufferedReader(new InputStreamReader(System.in));
str=obj.readLine();
choice=Integer.parseInt(str);
switch(choice)
{
case 1:
System.out.println("Enter
the item to insert:");
System.out.flush();
item=obj.readLine();
System.out.println("Enter
the position to insert item:");
str=obj.readLine();
pos=Integer.parseInt(str);
itemList.insertElementAt(item,pos-1);
break;
case 2:
System.out.println("Enter
the item to insert:");
System.out.flush();
item=obj.readLine();
itemList.addElement(item);
break;
case 3:
len=itemList.size();
System.out.println("\n****Item
Display****\n");
for(i=0;i<len;i++)
{
System.out.print((i+1)+")"+itemList.elementAt(i)+"\n");
}
break;
case 4:
System.out.println("Enter
the Item you want to delete");
str=obj.readLine();
itemList.removeElement(str);//string
is not needed to convert object type as it is already
break;
case 5:
System.out.println("\n\n
Thank you! Come Again");
System.exit(i);
break;
default:
System.out.println("\n
Invalid Choice\n Try again\n");
}
}
catch(Exception
e)
{}
}
}
}
Output:
E:\BCA>java
menudriven
*****Shopping
List*****
Enter your
Choice
1.Add Item
at the specified Location
2.Add Item
at the end of the list
3.Print
Vector List
4.Delete
Item
5.Exit
1
Enter the
item to insert:
Maggie
Enter the
position to insert item:
1
*****Shopping
List*****
Enter your
Choice
1.Add Item
at the specified Location
2.Add Item
at the end of the list
3.Print
Vector List
4.Delete
Item
5.Exit
1
Enter the
item to insert:
SoyMilk
Enter the
position to insert item:
1
*****Shopping
List*****
Enter your
Choice
1.Add Item
at the specified Location
2.Add Item
at the end of the list
3.Print
Vector List
4.Delete
Item
5.Exit
3
****Item
Display****
1)SoyMilk
2)Maggie
*****Shopping
List*****
Enter your
Choice
1.Add Item
at the specified Location
2.Add Item
at the end of the list
3.Print
Vector List
4.Delete
Item
5.Exit
1
Enter the
item to insert:
Egg
Enter the
position to insert item:
2
*****Shopping
List*****
Enter your
Choice
1.Add Item
at the specified Location
2.Add Item
at the end of the list
3.Print
Vector List
4.Delete
Item
5.Exit
3
****Item
Display****
1)SoyMilk
2)Egg
3)Maggie
*****Shopping
List*****
Enter your
Choice
1.Add Item
at the specified Location
2.Add Item
at the end of the list
3.Print
Vector List
4.Delete
Item
5.Exit
1
Enter the
item to insert:
Candle
Enter the
position to insert item:
3
*****Shopping
List*****
Enter your
Choice
1.Add Item
at the specified Location
2.Add Item
at the end of the list
3.Print
Vector List
4.Delete
Item
5.Exit
3
****Item
Display****
1)SoyMilk
2)Egg
3)Candle
4)Maggie
*****Shopping
List*****
Enter your
Choice
1.Add Item
at the specified Location
2.Add Item
at the end of the list
3.Print
Vector List
4.Delete
Item
5.Exit
2
Enter the
item to insert:
Soap
*****Shopping
List*****
Enter your
Choice
1.Add Item
at the specified Location
2.Add Item
at the end of the list
3.Print
Vector List
4.Delete
Item
5.Exit
3
****Item
Display****
1)SoyMilk
2)Egg
3)Candle
4)Maggie
5)Soap
****Shopping
List*****
Enter your
Choice
1.Add Item
at the specified Location
2.Add Item
at the end of the list
3.Print
Vector List
4.Delete
Item
5.Exit
4
Enter the
Item you want to delete
SoyMilk
*****Shopping
List*****
Enter your
Choice
1.Add Item
at the specified Location
2.Add Item
at the end of the list
3.Print
Vector List
4.Delete
Item
5.Exit
3
****Item
Display****
1)Egg
2)Candle
3)Maggie
4)Soap
*****Shopping
List*****
Enter your
Choice
1.Add Item
at the specified Location
2.Add Item
at the end of the list
3.Print
Vector List
4.Delete
Item
5.Exit
5
Thank you! Come Again
Ex.No.6(a) Simple
message using Applet
Aim: To
display a simple message using Applet.
Algorithm:
Step1: Start
Step2:
Set the string to be displayed as “Welcome Applet”
Step3: using
drawString(), setColor(), drawLine() from
java.applet & java.awt packages give the color attributes
Step4:
Display the applet using “AppletViewer”
Step5: Stop
/* Simple message using Applet */
import
java.awt.*;
import
java.applet.*;
public class
colapp extends Applet
{
public void
paint(Graphics g)
{
String
s="Welcome Applet";
g.drawString(s,150,100);
g.setColor(Color.red);
g.drawLine(10,10,100,10);
g.setColor(Color.blue);
g.drawLine(100,10,100,100);
g.setColor(Color.green);
g.drawLine(10,10,100,100);
}
}
/*<applet
code="colapp" width=200 height=200>
</applet>*/
Output:
E:\BCA>appletviewer
colapp.java
Ex.No. 6(b) Factorial of a number using Applet
Aim: To
develop an applet that receives an integer in the text field and compute its factorial value and returns
it in another field when the button named “Compute” is clicked.
Algorithm:
Step1: Start
Step2:
Design two text boxes, a label and a button
Step3: Get
the input value to find factorial
Step4: Name
the button as “Compute”
Step5: Using
ActionListener(), get the actionPerformed, read the input and calculate its
factorial
Step6:
Return the value in another text box
Step7: Stop
/* Factorial of a number using Applet*/
import
java.awt.*;
import
java.awt.event.*;
import
java.applet.*;
public class
fact extends Applet implements ActionListener
{
int n;
TextField
t1,t2;
Label l1;
Button b;
public void
init()
{
l1=new
Label("Enter n value",Label.LEFT);
t1=new
TextField(20);
b=new
Button("Compute");
t2=new
TextField(20);
add(l1);
add(t1);
add(b);
add(t2);
b.addActionListener(this);
}
public void
actionPerformed(ActionEvent ae)
{
String s1=t1.getText();
int f=1;
int
n=Integer.parseInt(s1);
for(int
i=1;i<=n;i++)
f=f*i;
String
s="Factorial Value="+f;
t2.setText(s);
}
}
/*<applet
code="fact" width=300 height=300>
</applet>*/
Output:
Ex.No.7(a) Handling Mouse Events
Aim: To
handle various mouse events and display them on an applet
Algorithm:
Step1: Start
Step2: Add
MouseListener & MouseMotionListener
Step3: Using drawstring display the message inside
the applet window on the various events below
Step3:
Perform various mouse events on the applet window
When the
mouse is entered into the applet window display “Mouse Entered”
When the
mouse is clicked inside the applet window display”Mouse Clicked”
When the
mouse is exited out of the applet window display”Mouse Exited”
When the
mouse is pressed inside the applet window, display”Mouse Pressed”
When the
mouse is dragged inside the applet window display”Mouse dragged”
When the
mouse is released display”Mouse released”
Step4: Stop
/* Handling
Mouse Events */
import
java.awt.*;
import
java.applet.Applet;
import java.awt.event.*;
public class
Mouseevents extends Applet implements MouseListener,MouseMotionListener
{
String
msg="";
int x=0,y=0;
public void
init()
{
addMouseListener(this);
addMouseMotionListener(this);
}
public void
mouseClicked(MouseEvent me)
{
x=10;
y=20;
msg="mouse
clicked";
repaint();
}
public void
mouseEntered(MouseEvent me)
{
x=10;
y=20;
msg="mouse
entered";
repaint();
}
public void
mouseExited(MouseEvent me)
{
x=10;
y=20;
msg="mouse
exited";
repaint();
}
public void
mousePressed(MouseEvent me)
{
x=me.getX();
y=me.getY();
msg="down";
repaint();
}
public void
mouseReleased(MouseEvent me)
{
x=me.getX();
y=me.getY();
msg="up";
repaint();
}
public void
mouseDragged(MouseEvent me)
{
x=me.getX();
y=me.getY();
msg="*";
showStatus("dragging
mouse at"+x+","+y);
repaint();
}
public void
mouseMoved(MouseEvent me)
{
showStatus("moving
mouse at"+me.getX()+","+me.getY());
}
public void
paint(Graphics g)
{
g.drawString(msg,x,y);
}
}
/*<applet
code="Mouseevents"width=200 height=100>
</applet>*/
Output:
Ex.No.7(b) Multithreading
Aim: To
create three threads. First thread displays “Good Morning” every one second,
the second thread displays “Hello” every two seconds and the third thread
displays “Welcome” every three seconds.
Algorithm:
Step1: Start
Step2:
Initialize a thread and String to display a message
Step3:
Display the first message “Good morning” and using Thread.sleep() freeze the
current thread until the counting loop completes (i.e every 1 second)
Step4:
Display the second message” Hello” and call in Thread.sleep() until every 2
secs
Step5:
Display the third message” Welcome” and wait for 3 secs
Step6:
Repeat the step one by one until the user presses Ctrl + c to stop the loop
Step7: Stop
/* Multithreading */
class mt implements
Runnable
{
Thread t;
String s;
int r;
mt(String
ss, int tt)
{
t=new
Thread(this, ss);
s=ss;
r=tt;
t.start();
}
public void
run()
{
for(; ;)
{
System.out.println(s);
try
{
Thread.sleep(r);
}
catch(Exception
e)
{
}
}
}
}
class ab2
{
public
static void main(String ar[])
{
mt t1=new
mt("good morning",1000);
mt t2=new
mt("hello",2000);
mt t3=new
mt("welcome",3000);
}}
Output:
E:\BCA>java
multi
good morning
welcome
hello
good morning
hello
good morning
welcome
good morning
hello
good morning
good morning
welcome
hello
good morning
good morning
hello
good morning
welcome
good morning
hello
Ex.No.7( c) Producer- consumer problem
using Inter Thread Communication
Aim: To
implement producer consumer problem using the concept of inter thread
communication/message passing technique
Algorithm:
Step1: Start
Step2: Encounter # of slots in the buffer
Step3: Generate an item to put into the producer
buffer
Step4: Using
wait() ,wait until the producer produces the item
Step5: Using
the notify() ,notify the consumer class to consume the item produced from the
producer in the buffer
Step6:
Continue the process until the user presses Ctrl+c
Step7: Stop
/* Producer-
consumer problem using Inter Thread Communication */
class Q
{
boolean valueSet=false;
int n;
synchronized
int get()
{
if(!valueSet)
try
{
wait();
}
catch(InterruptedException
e)
{
System.out.println("Exception
is:"+e);
}
System.out.println("got:"+n);
notify();
return n;
}
synchronized
void put(int n)
{
if(valueSet)
try
{
wait();
}
catch(InterruptedException
e)
{
System.out.println
("\n
Exception in put:"+e);
}
this.n=n;
valueSet=true;
System.out.println("\nput:"+n);
notify();
}
}
class
Producer implements Runnable
{
Q q;
Producer(Q
q)
{
this.q=q;
new
Thread(this,"Producer").start();
}
public void
run()
{
int i=0;
while(true)
q.put(i++);
}
}
class
Consumer implements Runnable
{
Q q;
Consumer(Q
q)
{
this.q=q;
new
Thread(this,"Consumer").start();
}
public void
run()
{
while(true)
q.get();
}
}
class
ProdConsDemo
{
public
static void main(String args[])
{
Q q=new Q();
new
Producer(q);
new
Consumer(q);
System.out.println("\n
press ctrl+c to stop");
}
}
Output:
E:/BCA>java
ProdConsDemo
Put:0
Put:0
Put:0
Put:0
Put:0
Put:0
Put:0
Put:0
Put:0
Put:0
Got 0
-------------------
got:15
got:15
got:15
got:15
got:15
got:15
got:15
got:15
got:15
Ex.No.8 Exception Handling
Aim: To perform integer divisions with user
interface using Exception .
Algorithm:
Step1: Start
Step2:
Design three text fields in which the user gives two inputs to divide and in
the third text field the result is displayed
Step3: The quotient is returned in the third text
box after “Divide button” is clicked
Step4: If one or two of the inputs is not in number
format, display “Numberformat Exception”
Step5: If
the input is 0 display “Arithmetic Exception” in message box
Step6: Stop
/* Exception Handling */
import
java.awt.*;
import
java.awt.event.*;
import
java.applet.*;
public class
Div extends Applet implements ActionListener
{
String msg;
TextField
num1,num2,res;
Label
l1,l2,l3;
Button div;
public void
init()
{
l1=new
Label("Number 1");
l2=new
Label("Number 2");
l3=new
Label("result");
num1=new
TextField(10);
num2=new
TextField(10);
res=new
TextField(10);
div=new Button("DIV");
div.addActionListener(this);
add(l1);
add(num1);
add(l2);
add(num2);
add(l3);
add(res);
add(div);
}
public void
actionPerformed(ActionEvent ae)
{
String
arg=ae.getActionCommand();
if(arg.equals("DIV"))
{
String
s1=num1.getText();
String s2=num2.getText();
int
num1=Integer.parseInt(s1);
int
num2=Integer.parseInt(s2);
if(num2==0)
{
try
{
System.out.println("
");
}
catch(Exception
e)
{
System.out.println("Arithemetic
Exception"+e);
}
msg="Arithemetic
Exception";
repaint();
}
else
if((num1<0)||(num2<0))
{
try
{
System.out.println("");
}
catch(Exception
e)
{
System.out.println("NumberFormat"+e);
}
msg="NumberFormatException";
repaint();
}
else
{
int
num3=num1/num2;
res.setText(String.valueOf(num3));
}
}
}
public void
paint(Graphics g)
{
g.drawString(msg,30,70);
}
}
/*<applet
code="Div" width=230 height=250> </applet>*/
Output:
Ex.No.9(a) Client / Server Application
Aim: To perform
a simple client/server application where the client sends data to a server &
the server receives the data, uses it to produce a result, and then sends the
result back to the client & the client displays the result on the
console.
Algorithm:
Client Program:
Step1:
Start
Step2: Implement the socket and port number using
the java.net package
Step3: Get the radius from the user to send to the
server
Step4: Retrieve the output from the server using
getOutputStream()
Step5: Print the area of circle
Step6:
Stop
Server Program:
Step1:
Start
Step2:
Implement the socket and port number using the java.net package
Step3:
Wait for the client request
Step4:
Accept the socket from client using InputStreamReader()
Step5:
Calculate with the received radius using the formula for area of circle i.e πr2
Step6:
Return the value to the client using PrintStream()
Step7:
Stop
/* Client / Server Application */
Client
program:
import
java.io.*;
import
java.net.*;
class
Client
{
public
static void main(String[] args) throws Exception
{
Socket
s=new Socket("localhost",8080);
BufferedReader
br;
String
str;
System.out.println("enter
the radius to send the server");
br=new
BufferedReader(new InputStreamReader(System.in));
PrintStream
ps=new PrintStream(s.getOutputStream());
ps.println(br.readLine());
br=new
BufferedReader(new InputStreamReader(s.getInputStream()));
str=br.readLine();
System.out.println("Area
of circle:"+str);
ps.close();
br.close();
}
}
Server
Program:
import
java.io.*;
import
java.net.*;
class
Server
{
public
static void main(String[] args)
{
try
{
ServerSocket
ss=new ServerSocket(8080);
System.out.println("wait
for client request");
Socket
s=ss.accept();
BufferedReader
br=new BufferedReader(new InputStreamReader(s.getInputStream()));
String
str;
str=br.readLine();
System.out.println("recieved
radius");
double
r=Double.parseDouble(str);
double
area=3.14*r*r;
PrintStream
ps=new PrintStream(s.getOutputStream());
ps.println(String.valueOf(area));
ps.close();
br.close();
s.close();
ss.close();
}
catch(Exception
e)
{
System.out.println("exception
occur at:"+e.toString());
}
}
}
Output:
Server
side:
D:\bca>javac
server.java
D:\bca>java
Server
wait
for client request
recieved
radius
Client
side:
D:\bca>javac
client.java
D:\bca>java
Client
enter
the radius to send the server
10
Area
of circle:314.0
Ex.No.9(b) Draw lines,
rectangles and ovals using JApplet
Aim: To develop an applet
that allows the
user to draw lines, rectangles and ovals.
Algorithm:
Step1: Start
Step2: Using java.applet.Applet and Graphics(_) call
the functions
Call in
drawLine() to draw a line
Call
drawRect() to draw a rectangle
Call
fillRect() to draw a color filled rectangle
Call
drawOval() to draw an oval
Call
fillOval() to fill the oval
Step3: Stop
/* Draw lines, rectangles and ovals using JApplet */
import
java.awt.*;
import
java.applet.Applet;
public
class DrawShapes extends Applet
{
public
void paint(Graphics g)
{
g.drawLine(40,30,200,30);
g.drawRect(40,60,70,40);
g.fillRect(140,60,70,40);
g.drawOval(40,120,70,40);
g.fillOval(140,120,70,40);
}
}
/*<applet
code="DrawShapes.class" height=500 width=500></applet>*/
Output:
Ex.No.10 (a) Abstract Class
Aim: To create an abstract class to return the #
of sides in the given geometrical figures using numberOfSides()
Algorithm:
Step1: Start
Step2: Create an abstract class and declare the
numberOfSides()
Step3: create Trapezoid class extending the abstract
class and return its # of sides
Step4:
Create Triangle class extending the abstract class and return its # of sides
Step5:
Create Hexagon class extending the
abstract class and return its # of sides
Step6: Display
the result
Step7: Stop
/* Abstract Class */
abstract
class Shapes{
abstract
void numberOfSides();
}
class
Trapezoid extends Shapes{
void
numberOfSides(){
System.out.println("Number
of sides for Trapezoid is 5");
}
}
class
Triangle extends Shapes{
void
numberOfSides(){
System.out.println("Number
of sides for triangle is 3");
}
}
class
Hexagon extends Shapes{
void
numberOfSides()
{
System.out.println("Number
of sides for Hexagon is 6");
}
}
class
Abstractclass
{
public
static void main(String[] args)
{
Shapes s;
s=new
Trapezoid();
s.numberOfSides();
s=new
Triangle();
s.numberOfSides();
s=new
Hexagon();
s.numberOfSides();
}
}
Output:
E:\BCA>java
Abstractclass
Number of
sides for Trapezoid is 5
Number of
sides for triangle is 3
Number of
sides for Hexagon is 6
Ex.10(b) Display the table using JTable component
Aim: To display the table using JTable component.
Algorithm:
Step1: Start
Step2: Using
javax.swing & JTable component create a table
Step3: Give four
fields, “NAME”, “Roll #” , “Dept” and “Percentage of Marks”
Step4: Give
all the input in a string array
Step5: Add
Scroll panel, Borderlayout and content panel using java Table
Step6: Print
the table in the applet
Step7: Stop
/* Display the table using JTable component */
import
java.awt.*;
import
javax.swing.*;
public
class Table1 extends JApplet
{
public
void init()
{
Container
con=getContentPane();
BorderLayout
b=new BorderLayout();
con.setLayout(b);
final
String[]
colHeads={"Name","RollNumber","Dept","Percentage"};
final
String[][] data={{"Hari","0501","BCA","75.05%"},{"Ajay","0341","MCA","90.78%"},{"vijaya","0401","CS","70.05%"},{"Mani","0402","IT","90.12%"},{"Lakshmi","0201","BCA","80.12%"},{"Prabu","1214","cseIT","80.05%"}};
JTable
table1=new JTable(data,colHeads);
int
v=ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED;
int
h=ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED;
JScrollPane
scroll=new JScrollPane(table1,v,h);
con.add(scroll);
}
}
/*<applet code="Table1.class"
height=600 width=600> </applet> */
Output:
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