JAVA.pdf

JYOTIRADIRYA BHATT 2102818 BCA A 38
1
1. WAP in java to simulate condition to generate Wi-Fi password. Take input as Name, City,
Age and Gender.
* import java.util.Scanner;
public class termwork1 {
public static void main(String[] args) {
String name,city,gender;
int age;
Scanner sc=new Scanner(System.in);
System.out.println("Enter the name:");
name=sc.next();
if(name.length()<=3)
{
System.out.println("Name should be greater than 3 words:");
System.out.println("Enter the name:");
name=sc.next();
}
System.out.println("Enter the city:");
city=sc.next();
if(city.length()<=3)
{
System.out.println("City name should be grater than 3 words:");
System.out.println("Enter the city:");
city=sc.next();
}
System.out.println("Enter the gender(M/F):");
gender=sc.next();
System.out.println("Enter the age:");
age=sc.nextInt();
if(age==18)
{
System.out.println("Enter the age again:");
age=sc.nextInt();
}
PasswordGenerator pa=new
PasswordGenerator(name,city,gender,age);
}
}
class PasswordGenerator
{
String password="";

2
int age,sum=0,counter=0,diff=0;
PasswordGenerator(){
}
PasswordGenerator(String n,String c,String g,int a) {
if (g.equals("F") && a < 18) {
for (int i = 0; i < 3; i++) {
password = password + String.valueOf(n.charAt(i));
}
String d = Integer.toString(a);
for (int i = 0; i < d.length(); i++) {
char ca = d.charAt(i);
sum = sum + Character.getNumericValue(ca);
}
password = password + Integer.toString(sum);
int i=c.length()-3;
while (counter != 3) {
password = password + String.valueOf(c.charAt(i));
i++;
counter++;
}
System.out.println(password);
}
else if(g.equals("F")&& a>18)
{
int i=n.length()-3;
while (counter != 3) {
i++;
counter++;
}
String d=Integer.toString(a);
for(int j=0;j<d.length();j++)
{
char ca = d.charAt(j);
if(ca>diff){
diff = Character.getNumericValue(ca)-diff;}
else if(ca<diff){
diff = diff- Character.getNumericValue(ca);
}
else
{

3
diff=1;
}
}
password = password + Integer.toString(diff);
for (int j = 0; j < 3; j++) {
password = password + String.valueOf(c.charAt(j));
}
}
else {
int i=0,j=0;
while( i<n.length()&& j<c.length()) {
password = password + String.valueOf(c.charAt(j));
i++;
j++;
}
password=password+a;
}
}
}
*
OUTPUT

4
2. WAP in Java to initialize a string in order to find that character which frequency is 2nd most in
that string.
*
import java.util.Scanner;
public static void main(String[] args){
String s="";
System.out.println("enter the string");
s=sc.next();
int l=s.length();
int ar[]=new int[l];
for(int i=0;i< ar.length;i++)
ar[i]=1;
for(int i=0;i<l;i++)
{
for(int j=i+1;j<l;j++)
{
if(ar[j]!=-1) {
if (s.charAt(i) == (s.charAt(j))) {
ar[j]=-1;
++ar[i];
}
}
}

5
}
int max=0,smax=0,n=0;
for(int i=0;i<ar.length;i++)
for(int j=i+1;j<ar.length-1;j++)
{
if(ar[j]!=-1)
{
if(ar[i]>=ar[j])
{
max = ar[i];
if(ar[j]<=max&&ar[j]>=smax)
{
n=j;
smax=ar[j];
}
}
}
}
System.out.println("the letter with second highest frequency is "+s.charAt(n)+" and no.of
times its came is "+ar[n]);
}
}
*
OUTPUT

6
3.WAP to check longest sub sequence of a same character in an initialized string?[aaaabppppp,
p=5] [aabbcc, a=2].
*
import java.util.Arrays;
String s="";
System.out.println("enter the string");
s=sc.next();
int[] ar =new int[s.length()];
Arrays.fill(ar, 1);
for(int j=i+1;j<ar.length;j++)
{
if (ar[i] != -1||ar[j]!=-1) {
if (s.charAt(i) == s.charAt(j))
{
ar[j]=-1;
++ar[i];

7
}
else
break;
}
}
int max=0,n=0;
if(ar[i]!=-1)
{
if(ar[i]>max)
{
max=ar[i];
n=i;
}
}
System.out.println("the letter with most occurrence is :: "+s.charAt(n)+" which repeats ::
"+max+" times");
}
}*
OUTPUT

8
4.WAP to generate wifi key as user will enter form value Name,City,Age and Gender?
*
public static void main(String []args)
{
String name="";
String city="";
int age;
String gender="";
System.out.println("enter the gender ::");
gender=sc.next();
System.out.println("enter the name ::");
name=sc.next();
System.out.println("enter the city name ::");
city=sc.next();
System.out.println("enter the age ::");
age=sc.nextInt();
System.out.println("the key generated is :: "+passwordGenerator(name,city,gender,age));
}
static String passwordGenerator(String n,String c,String g,int a)
{
String key="";
if(g.equals("M")||g.equals("m"))
{
for(int i=0;i<3;i++)

9
{
key=key+n.charAt(i);
}
String m=Integer.toString(a);
int i=0;
int k=(Character.getNumericValue(m.charAt(i))-
Character.getNumericValue(m.charAt(i+1)));
if(k>0)
key=key+k;
else if(k<0)
key=key+(-k);
else
key=key+0;
for(int j=2;j>=0;j--)
{
key=key+c.charAt((c.length()-1)-j);
}
}
else if(g.equals("F")||g.equals("f"))
{
for (int i=2;i>=0;i--)
{
key=key+n.charAt((n.length()-1)-i);
}
String m=Integer.toString(a);
int i=0;
int k=Character.getNumericValue(m.charAt(i))+Character.getNumericValue(m.charAt(i+1));
key=key+k;

10
for(int j=0;j<3;j++){
key=key+c.charAt(j);
}
}
return key;
}
} *
OUTPUT
5.WAP to delete only those text file which are non empty in these folder.[E://MCA/BCA/DCA]
*
import java.util.*;
import java.io.*;
public static void main(String[] args)throws Exception
{
File f = new File("E:/MCA/BCA/DCA");
File[] files=f.listFiles();
for(File f1:files) {
FileReader fr = new FileReader(f1);
int m;

11
if ((m = fr.read())!= -1) {
fr.close();
boolean s = f1.delete();
if (s)
System.out.println("file deleted");
else
System.out.println("file not deleted");
} else System.out.println("file is empty");
}
}
}
*
OUTPUT
6.WAP to create a method check which returns two values.If first string having a character twice
as well second string also then return both the string by removing that character?
*
public static void main(String[] ar)
{
String s1="";

12
String s2="";
System.out.println("enter the value of first string ");
s1=sc.next();
System.out.println("enter the value of second string ");
s2=sc.next();
System.out.println("enter the character that is needed to be checked");
String m=sc.next();
String s3[]=check(s1,s2,m);
System.out.println(s3[0]+" "+s3[1]);
}
static String [] check(String s1,String s2,String m)
{
String s []=new String[2];
int q=0,n=0;
for(int i=0;i<s1.length();i++)
{
if(m.charAt(0)==(s1.charAt(i)))
{
++q;
if(q==2)
{ s[0]="";
for(int j=0;j<s1.length();j++)
{
if(m.charAt(0)!=(s1.charAt(j)))
{
s[0]=s[0]+s1.charAt(j);
}

13
}
}
}
else if(q!=2)
s[0]=s1;
}
for(int i=0;i<s2.length();i++)
{
if(m.charAt(0)==(s2.charAt(i)))
{
++n;
if(n==2)
{s[1]="";
for(int j=0;j<s2.length();j++)
{
if(m.charAt(0)!=(s2.charAt(j)))
{
s[1]=s[1]+s2.charAt(j);
}
}
}
}
else if(n!=2)
s[1]=s2;
}
return s;
}

14
}
*
OUTPUT
7.WAP to print number of days gape in your age as enter DD-MM-YYYY with current system
date?
*
import java.text.*;
import java.util.*;
Scanner scanner = new Scanner(System.in);
// Get user input for birthdate
System.out.print("Enter your birthdate (DD-MM-YYYY): ");
String birthdateInput = scanner.next();
try {
// Calculate and print the age difference in days
int ageDifference = calculateAgeDifference(birthdateInput);
System.out.println("Number of days gap in your age: " +
ageDifference + " days");
} catch (ParseException e) {

15
System.out.println("Invalid date format. Please enter the date in DD-MM-YYYY format.");
}
}
private static int calculateAgeDifference(String birthdate) throws
ParseException {
// Get the current system date
Date currentDate = new Date();
// Define the date format for parsing
DateFormat dateFormat = new SimpleDateFormat("dd-MM-yyyy");
// Convert the input birthdate string to a Date object
Date birthdateObj = dateFormat.parse(birthdate);
// Calculate the age difference in days
long ageDifferenceInMillis = currentDate.getTime() -
birthdateObj.getTime();
int ageDifferenceInDays = (int) (ageDifferenceInMillis / (24 * 60 *
60 * 1000));
return ageDifferenceInDays;
}
}
*
OUTPUT

16
9.WAP in an Applet Make two Button one is Circle within Square and second is Square within
Circle. When user click on Circle within Square then draw Circle within Square. And when user
click on Square within Circle then draw Square within Circle on the panel window?
*
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
public class termwork9 extends Applet implements ActionListener
{
int i=0;
Button b1;
Button b2;
public void init()
{
b1=new Button("squareWithinCircle");
b1.addActionListener(this);
add(b1);
b2=new Button("cirleWithinSquare");
b2.addActionListener(this);
add(b2);
}
public void paint(Graphics g)
{
if (i==1){
g.drawRect(129,129,141,141);
g.drawOval(100,100,200,200);
}
else if(i==2)

17
{
g.drawOval(100,100,200,200);
g.drawRect(100,100,200,200);
}
}
public void actionPerformed(ActionEvent e)
{
if(e.getSource()==b1)
i=1;
else if(e.getSource()==b2)
i=2;
repaint();
}
}
//<applet code="termwork9.java" width=1000 height=1000></applet>
*
OUTPUT

18
10.WAP to put one Exception class in a package and to use this Exception class object in an
another package class method any how?
*
package Package1;
public class CustomException extends Exception

19
{
public CustomException(String message) {
super(message);
}
*
*
package Package2;
import Package1.CustomException;
public class ExampleClass {
public void someMethod() throws CustomException {
throw new CustomException("This is a custom exception.");
}
*
*
import Package2.ExampleClass;
import Package1.CustomException;
public class termwork10{
ExampleClass example = new ExampleClass();
try {
example.someMethod();
} catch (CustomException e) {
System.out.println("Caught custom exception: " +
e.getMessage());
}
*
OUTPUT

20
11.WAP to initialize 2D string array at runtime and to print reverse value of diagonal position
only?
*
String [][]a=new String[2][2];
{
for(int j=0;j<2;j++)
{
a[i][j]=sc.next();
}
}
reverseValue(a);
}
static void reverseValue(String[][]x)
{
{
for(int j=0;j<2;j++)
{
if(i==j)

21
{
String s=x[i][j].toString();
StringBuffer st=new StringBuffer(s);
st.reverse();
System.out.println("The diagonal reverse
value of "+x[i][j]+" is:"+st);
}
}
}
}
}
*
OUTPUT
12.WAP to show the Working of multithreading . Make separate program by using Runnable
interface And by using Thread Class .also use their methods .
*
class MyRunnable implements Runnable {
public void run() {
for (int i = 1; i <= 5; i++) {
System.out.println("Thread using Runnable: " + i);
try {

22
Thread.sleep(500); // Simulate some work being
done
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
public class termwork12{
MyRunnable myRunnable = new MyRunnable();
// Creating two threads using the same instance of
MyRunnable
Thread thread1 = new Thread(myRunnable);
Thread thread2 = new Thread(myRunnable);
// Starting the thread
thread1.start();
thread2.start();
}
}
*
OUTPUT

23
USING Thread CLASS
*
class MyThread extends Thread {
public void run() {
for (int i = 1; i <= 5; i++) {
System.out.println("Thread using Thread class: " + i);
try {
sleep(500); // Simulate some work being done
} catch (InterruptedException e) {
}
}
}
}

24
MyThread thread1 = new MyThread();
MyThread thread2 = new MyThread();
// Starting the threads
thread1.start();
thread2.start();
}
}
*
OUTPUT
13.WAP using Applet to draw circle, line ,rectangle and fill them with a color given by the user.
*
import java.applet.Applet;
import java.awt.*;
public class termwork13 extends Applet {
TextField colorTextField;

25
public void init() {
colorTextField = new TextField("#FF0000", 20);
Button fillButton = new Button("Fill Rectangle");
fillButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
repaint();
}
});
add(new Label("Enter color code (e.g., #FF0000):"));
add(colorTextField);
add(fillButton);
}
public void paint(Graphics g) {
g.drawLine(2, 3, 100, 100);
g.drawRect(200, 300, 400, 300);
g.drawOval(600,200,400,500);
String inputColor = colorTextField.getText();
try {
Color fillColor = Color.decode(inputColor);
g.setColor(fillColor);
g.fillRect(200, 300, 400, 300);
g.fillOval(600,200,400,500);
} catch (NumberFormatException ex) {
System.out.println("Invalid number format: " + inputColor);
System.out.println("Please enter a valid color code in the format #RRGGBB");
} catch (IllegalArgumentException ex) {
System.out.println("Invalid color code: " + inputColor);

26
System.out.println("Please enter a valid color code in the format #RRGGBB");
}
}
}
//<applet code="termwork13.java" width=1000 height=1000></applet>
*
OUTPUT
15.WAP to show the use of KeyListener/MouseListener interface in order to generate and
process those events.
*import javax.swing.*;
import java.awt.*;
public class Pt15 extends JFrame implements KeyListener, MouseListener {
public Pt15() {
setTitle("Event Demo");
setSize(300, 200);

27
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
addKeyListener(this);
addMouseListener(this);
setFocusable(true);
}
public void keyPressed(KeyEvent e) {
System.out.println("Key Pressed: " + e.getKeyChar());
}
public void keyReleased(KeyEvent e) {
System.out.println("Key Released: " + e.getKeyChar());
}
public void keyTyped(KeyEvent e) {
// Not used in this example
}
public void mouseClicked(MouseEvent e) {
System.out.println("Mouse Clicked at (" + e.getX() + ", " + e.getY() +
")");
}
public void mousePressed(MouseEvent e) {
}
public void mouseReleased(MouseEvent e) {
}
public void mouseEntered(MouseEvent e) {
}

28
public void mouseExited(MouseEvent e) {
}
SwingUtilities.invokeLater(new Runnable() {
public void run() {
new Pt15().setVisible(true);
}
});
}
}
*
OUTPUT
16.WAP to create TCP/IP Socket on both client and server side . and after socket creation
perform the Operation as done in chat server .
*
Client:
import java.io.*;
import java.net.*;

29
public class ChatClient {
try {
// Connect to the server on the specified port
Socket socket = new Socket("localhost", 12345);
// Set up input and output streams
BufferedReader in = new BufferedReader(new
InputStreamReader(socket.getInputStream()));
PrintWriter out = new PrintWriter(socket.getOutputStream(),
true);
// Create a BufferedReader to read messages from the console
BufferedReader consoleInput = new BufferedReader(new
InputStreamReader(System.in));
// Start a thread to continuously read messages from the server
new Thread(() -> {
String serverMessage;
try {
while ((serverMessage = in.readLine()) != null) {
System.out.println("Server: " + serverMessage);
}
} catch (IOException e) {
}
}).start();
// Start a loop to read and send messages
String clientMessage;
while (true) {

30
// Read a message from the console and send it to the
server
System.out.print("Enter your message: ");
clientMessage = consoleInput.readLine();
out.println(clientMessage);
}
}
}
}
Server:
import java.io.*;
import java.net.*;
public class ChatServer {
try {
// Create a server socket and bind it to a specific port
ServerSocket serverSocket = new ServerSocket(12345);
System.out.println("Server is waiting for client
connection...");
// Wait for a client to connect
Socket clientSocket = serverSocket.accept();
System.out.println("Client connected!");
// Set up input and output streams
BufferedReader in = new BufferedReader(new
InputStreamReader(clientSocket.getInputStream()));

31
PrintWriter out = new
PrintWriter(clientSocket.getOutputStream(), true);
// Create a BufferedReader to read messages from the console
BufferedReader consoleInput = new BufferedReader(new
InputStreamReader(System.in));
// Start a loop to read and send messages
new Thread(() -> {
String clientMessage;
try {
while ((clientMessage = in.readLine()) != null) {
System.out.println("Client: " + clientMessage);
}
}
}).start();
String serverMessage;
while (true) {
// Read a message from the console and send it to the
client
System.out.print("Enter your message: ");
serverMessage = consoleInput.readLine();
out.println(serverMessage);
}
}

32
}
}
OUTPUT
SERVER
CLIENT

33
17.WAP to print all numeric digits sum of all database column values.
*
import com.sun.jdi.connect.Connector;
import java.sql.*;
public static void main(String[] args) throws
ClassNotFoundException, SQLException {
Class.forName("com.mysql.jdbc.Driver");
Connection
con=DriverManager.getConnection("jdbc:mysql://localhost:3306/testDB","root","Tsdk123#");
PreparedStatement pt=con.prepareStatement("Select *from Student ");
ResultSet rs=pt.executeQuery();
String s="";
while(rs.next())
{
s=rs.getString(1);
s=s+rs.getString(3);
}
System.out.println(s);
int sum=0;
for(int i=0;i<s.length();i++)
{
char c=s.charAt(i);
sum=sum+Character.getNumericValue(c);
}

34
System.out.println("Sum of column is :"+sum);
}
}
*
OUTPUT
18.WAP to update a table column value using stored procedures.
*
import java.sql.*;
try {
// Load the JDBC driver
Class.forName("com.mysql.cj.jdbc.Driver");
Connection connection =
DriverManager.getConnection("jdbc:mysql://localhost:3306/termwork", "root", "Tdsk123#");
CallableStatement callableStatement =
connection.prepareCall("{call update_employees(?, ?)}");

35
callableStatement.setInt(1, 1); // Assuming 1 is the empid ofthe row you want to update
callableStatement.setString(2, "yogesh"); // New employee name
// Execute the stored procedure
callableStatement.execute();
System.out.println("Update successful!");
// Close resources
callableStatement.close();
connection.close();
} catch (ClassNotFoundException | SQLException e) {
e.printStackTrace(); }}
}
OUTPUT

36
19.WAP to show the use of transient keyword.
* import java.io.*;
class MyClass implements Serializable {
private int normalVariable;
transient private String transientVariable;
public MyClass(int normalVariable, String
transientVariable) {
this.normalVariable = normalVariable;
this.transientVariable = transientVariable;
}
public void printValues() {
System.out.println("Normal Variable: " +
normalVariable);
System.out.println("Transient Variable: " +
transientVariable);
}
}
MyClass obj = new MyClass(42, "This is a transient
variable.");
try (ObjectOutputStream out = new
ObjectOutputStream(new
FileOutputStream("serialized_object.ser"))) {
out.writeObject(obj);
System.out.println("Object has been serialized.");

37
}
try (ObjectInputStream in = new ObjectInputStream(new
FileInputStream("serialized_object.ser"))) {
MyClass deserializedObj = (MyClass)
in.readObject();
System.out.println("Object has been
deserialized.");
deserializedObj.printValues();
} catch (IOException | ClassNotFoundException e) {
}
}
}*
OUTPUT

38
22.WAP for following OUTPUT String s="san12may4tya7yyy678rtb62tp"
Output 2 will 4*7=28
Output 1 will sanmytrbp
Output 3 will 12+678+62=690+62 =....
*
String p = "san12may4tya7yyy678rtb62tp";
int count = 0, mul = 1, sum = 0;
String f = "";
for (int i = 0; i < p.length(); i++) {
char c = p.charAt(i);
if (Character.isDigit(c)) {
char d = p.charAt(i + 1);
char e = p.charAt(i - 1);
if (!Character.isDigit(d) && !Character.isDigit(e)) {
mul = mul * Character.getNumericValue(c);
} else if (Character.isDigit(d)) {
sum = sum + Character.getNumericValue(c) + Character.getNumericValue(d);
char g = p.charAt(i + 2);
if (Character.isDigit(g)) {
sum = sum + Character.getNumericValue(g);
}
}
} else if (Character.isLetter(c)) {
if (!f.contains("" + p.charAt(i))) {

39
f = f + p.charAt(i);
}
}
}
System.out.println("Output 1 for:4*7" + mul);
System.out.println("Output 2 for:" + f);
System.out.println("Output 3" + sum);
}
} *
OUTPUT
23. Enter a no and than create array of its digits.ie.If no is 123456 thanStore it's digit in int array
of size 6 as If array is a than a[0] should 1 and a[1] should 2......Also after storing in array a then
reverse it's all value without using another array i.e After reversing a[0] should 6 and a[1] should
5 ......print common elemnts of both array.
*
Scanner sc = new Scanner(System.in);
System.out.println("Enter the number:");
String s = sc.next();
int c = s.length();
int[] a = new int[c];
// Convert the input string to an array of integers

40
for (int i = 0; i < c; i++) {
a[i] = Character.getNumericValue(s.charAt(i));
}
// Print the original array
System.out.print("Original Array: ");
for (int i = 0; i < c; i++) {
System.out.print(a[i] + " ");
}
// Reverse the array
int temp;
for (int i = 0; i < c / 2; i++) {
temp = a[i];
a[i] = a[c - 1 - i];
a[c - 1 - i] = temp;
}
// Print the reversed array
System.out.print("nReversed Array: ");
for (int i = 0; i < c; i++) {
}
System.out.print("nCommon Elements: ");
for (int i = 0; i < c; i++) {
if (a[i] == a[c - 1 - i]) {
}
}
}

41
} *
OUTPUT
24.Wap to initlize two integer array of user enterd size .Then perform following operations1.add
elements in that array which is longest .I.e. if first array is of 3 size having elements 1,2,3Second
array is of size five and elements are 4,5,6,7,8 Than result array will second and now it's
elements will 5,7,9,7,8
*
import java.util.*;
public static void main(String ss[])
{
int n=0,m=0;
System.out.println("enter the size of array 1");
n=sc.nextInt();
System.out.println("enter the value of array 2");
m=sc.nextInt();
int a[]=new int[n];
int b[]=new int[m];
System.out.println("enter the elements of array 1");
for(int i=0;i<n;i++)
{

42
a[i]=sc.nextInt();
}
System.out.println("enter the elements of array 2");
for(int i=0;i<m;i++)
{
b[i]=sc.nextInt();
}
if(a.length>=b.length)
{
for(int i=0;i<b.length;i++)
a[i]=a[i]+b[i];
for(int j=0;j<a.length;j++)
System.out.print(a[j]+" ");}
else if(a.length<b.length)
{for(int i=0;i<a.length;i++)
b[i]=b[i]+a[i];
for(int j=0;j<b.length;j++)
System.out.print(b[j]+" ");}
}
} *
OUTPUT

43
25. Initlize integer array of any size containg values 0 and 1 only. Now check which is longest
series of either 0 or 1 ,which is existing.I.e. if array values are{1,1,1,0,0,1,1,0,0,0,0,0,1,1,1}Ans is
0 and length is 5 If there is same series of 0 and 1 then ans will which is existing firstI.e. if array
values are {1,1,1,0,0,1,1,0,0,0,1,1,1} Ans is 1 and length is 3 As 1,1,1 comming first before 0,0 0
*
import java.util.*;
public static void main(String[]sd)
{
int n=0;
System.out.println("enter the size of array");
n=sc.nextInt();
int[] a=new int[n];
System.out.println("enter the elements of array a");
for(int i=0;i<n;i++)
a[i]=sc.nextInt();
int[] b =new int[n];
for (int i=0;i<n;i++)
{
b[i]=1;
}
for(int i=0;i<a.length-1;i++)
{
for (int j=i+1;j<a.length;j++) {
if (a[j] != -1||a[i]!=-1) {

44
if (a[i] == a[j]) {
b[j]=-1;
++b[i];
}
else
break;
}
}
}
int max=0,m=0;
for(int i=0;i<b.length;i++)
if(b[i]!=-1)
{
if(b[i]>max)
{
max=b[i];
m=i;
}
}
System.out.println("ans is "+ a[m] +" which repeats :: "+max+" times");
}
} *
OUTPUT

45

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