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Showing posts with the label java programming

Servlet Program to Print Today’s Date and Time using refresh header

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Simple Java Servlet Program to Print Date and Time using refresh header (Time updates automatically) Code: import java.io.*; import javax.servlet.*; import javax.servlet.http.*; import java.util.Date; public class servlet2 extends HttpServlet { public void doGet(HttpServletRequest req, HttpServletResponse rsp) throws ServletException, IOException { rsp.setIntHeader("Refresh", 1); rsp.setContentType("text/html"); PrintWriter out = rsp.getWriter(); Date now = new Date(); out.println("<html>"); out.println("<head><title> Time Check </title></head>"); out.println("<body>"); out.println("<p text-align=auto>Current Time: " + now + "</p>"); out.println("</body></html>"); } }
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Java program to implement Word Count using Map-Reduce in Hadoop Cluster

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Simple Java program to implement Word Count using Map-Reduce in Hadoop Cluster Code: import java.io.IOException; import java.util.StringTokenizer;  import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.fs.Path; import org.apache.hadoop.io.IntWritable; import org.apache.hadoop.io.Text; import org.apache.hadoop.mapreduce.Job; import org.apache.hadoop.mapreduce.Mapper; import org.apache.hadoop.mapreduce.Reducer; import org.apache.hadoop.mapreduce.lib.input.FileInputFormat; import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;   public class wc {     public static class TokenizerMapper     extends Mapper<Object, Text, Text, IntWritable>{   private final static IntWritable one = new IntWritable(1); private Text word = new Text();   public void map(Object key, Text value, Context context                 ) throws IOException, InterruptedException {   StringTokenizer ...
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Java program to implement Apriori Algorithm

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Simple Java program to implement Apriori Algorithm Code: package apriori; import com.sun.xml.internal.ws.util.StringUtils; import java.util.*; import java.lang.Object; public class Apriori { public static void main(String[] args) { Scanner sc = new Scanner(System.in); System.out.println("Enter Number Of Transactions:"); int n = sc.nextInt(); System.out.println("Enter Minumum Limit:"); int min = sc.nextInt(); sc.nextLine(); ArrayList<Set<String>> aray = new ArrayList<>(); Set<String> list = new HashSet<>(); Set<String> list1= new HashSet<>(); Set<String> list2,list3,list4; System.out.println("Enter Item id saperated by space per transaction"); for(int i=0;i<n;i++){ System.out.println("Entere Item Id included in transaction-"+(i+1)); String tempp =sc.nextLine(); Se...
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Java program to check the given string is palindrome or not without using Reverse String

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Simple Java program to check the given string is palindrome or not without using Reverse String Code: import java.util.Scanner; class p84{public static void main(String args[]){ Scanner sc = new Scanner(System.in); String s = sc.nextLine(); boolean palindrome=true; int j=(s.length()-1); for(int i=0;i<(s.length()/2);i++){ if(s.charAt(i)!=s.charAt(j)){palindrome=false;} j--; } if(palindrome){System.out.println("palindrome");} else{System.out.println("Not palindrome");} }}
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Java program to count words starting with capital letters in given line

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Simple Java program to count words starting with capital letters in given line Code: import java.util.Scanner; class p83{public static void main(String args[]){ Scanner sc=new Scanner(System.in); String s; System.out.println("Enter a line:"); s=sc.nextLine(); int count=0; for(String str: s.split(" ")) { if(str.charAt(0)>=65 && str.charAt(0)<=90) { count++; } } System.out.println("total number of words start with capital letters are :"+count); }}
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Java program to calculate occurrence of consonants and vowels in given line

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Simple Java program to calculate the number of consonants and vowels present in given line Code: import java.util.Scanner; class p82{public static void main(String args[]){ String s = new String(); int co=0,cs=0; Scanner sc = new Scanner(System.in); s=sc.nextLine(); for(int i=0;i<s.length();i++){ char c = s.charAt(i); if(c=='a'||c=='e'||c=='i'||c=='o'||c=='u'||c=='A'||c=='E'||c=='I'||c=='O'||c=='U'){co++;} else if(!(c=='a'||c=='e'||c=='i'||c=='o'||c=='u'||c=='A'||c=='E'||c=='I'||c=='O'||c=='U') && ((c>=65 && c<=90) || (c>=97 && c<=122))){cs++;} } System.out.println("Vowels: "+co); System.out.println("Consonant: "+cs); }}
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Java program to implement concept of Abstract Class

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Simple Java program to implement concept of Abstract Class Code: abstract class phone{ void rearcamera(){System.out.println("Capturing from rear camera");} void rflesh(){System.out.println("Capturing from rear camera");} void frontcamera(){System.out.println("Capturing from front camera");} abstract void fflesh(); } class model extends phone { void fflesh(){System.out.println("No front flesh available");} } class abstracte{ public static void main(String arg[]){ model e70 = new model(); e70.rearcamera();e70.rflesh();e70.frontcamera();e70.fflesh(); } }
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Java program to implement use of Final Keyword on Class, Method and Variable

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Simple Java program to use Final Keyword on following items: Variable Class Method Code: class a{ final int a=5; void setfinala(int x) { a=x; } final void finalmethod() { System.out.println("Final method."); } } class a1 extends a{ void finalmethod() { System.out.println("Final method in extended class."); } } final class b{ } class c extends b{ } class p33{ public static void main(String args[]){ a obj = new a(); a.setfinala(3); } } Note: The program won't run because of error and that error is output of our program.
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Java program to implement concept of Inner Class

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Simple Java program to implement use of Inner Class Code: class Outer{ private int data=30; class Inner{ void msg(){System.out.println("data is "+data);} } } class innersample{ public static void main(String args[]){ Outer obj=new Outer(); Outer.Inner in=obj.new Inner(); in.msg(); } }
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Java program to check palindrome number using recursion

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Simple Java program to check whether the number is palindrome or not by using Recursion. Code: import java.util.Scanner; class xyz{ int pd(int i,int j,int[] a){ while(i<j){ if(a[i]==a[j]){i++;j--;pd(i,j,a);} else{return 0;} } return 1; } } class palindrome{ public static void main(String args[]){ int x,i=0; System.out.println("Enter integer: "); Scanner sc = new Scanner(System.in); x=sc.nextInt(); int a[]=new int[10]; while(x!=0){ a[i]=x%10; x=x/10; i++; } xyz obj = new xyz(); if(obj.pd(0,i-1,a)==1){System.out.println("palindrome");} else{System.out.println("Not Palindrome");} } }
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Java program to implement patterns

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Simple Java program to implement the following pyramid pattern. 1 2 2 3 3 3 4 4 4 4    and 4 3 3 2 2 2 1 1 1 1 Code: public class pattern{ public static void main(String srgs[]){ System.out.println("first pattern"); int a=4; for(int i=1;i<=4;i++){ System.out.println(" "); for(int j=1;j<=i;j++){System.out.print(" " +i);} } System.out.println(" "); System.out.println("Second pattern"); for(int i=4;i>=1;i--){ System.out.println(" "); for(int j=1;j<=i;j++){System.out.print(" " +i);} } }} Si...
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Java servlet program to find larger number of given two numbers

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Simple Java servlet program which accepts two numbers using the post method and displays the smaller one.  Code: import java.io.IOException; import java.io.PrintWriter; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class server extends HttpServlet { protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html"); try (PrintWriter out = response.getWriter()) { int sum; int x,y; String a = request.getParameter("num1"); String b = request.getParameter("num2"); x = Integer.parseInt(a); y = Integer.parseInt(b); if(x>y){ out.println("First number "+x+" is greater"); } else{ out.println("Secnd number "+y+" is greater"); } } } }
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Menu driven Java JDBC program with PL/SQL

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Create a Menu driven program in JDBC (USE appropriate statement, preparestatement or callable statement object as an when require) Requirements: Display all the Records from the both tables by employee_number Insert Record into the Table. (Hint:- create stored procedure insertdata() in PL/SQL to insert all the field in both tables. Call the procedure from java application using callablestatement) Update The existing record by asking the useremployee_number) (HINT:- Take Updable Resultset) Delete Record by asking the user employee_number)) (HINT:- Take Updable Resultset) Program should handle SQLException and SqlWarning. Code: package aj.pkg13; import com.sun.swing.internal.plaf.basic.resources.basic; import java.io.File; import java.io.FileInputStream; import java.io.InputStream; import java.sql.*; import java.text.DateFormat; import java.text.SimpleDateFormat; import java.util.HashSet; import java.util.Scanner; public class AJ13 { public static void main(String[] args) { Scanner sc ...
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Java JDBC program to perform CRUD Operation on table using Updatable resultset

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Simple Java JDBC program to perform all CRUD operation on data stored in student table using updable resultset. Code: package aj.pkg12; import java.sql.*; import java.util.*; public class AJ12 { public static void main(String args[])throws Exception{ int i=0 , op=0; Float r; String s = null,str = null; String ch = null; Class.forName("com.mysql.jdbc.Driver"); Connection cn = DriverManager.getConnection("jdbc:mysql://localhost:3306/student","root",""); Scanner sc= new Scanner(System.in); Statement stm = cn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE); ResultSet rs = null; do{ System.out.println("Which operation do you want to perform ?\n1.Create Records\n2.Read Records\n3.Update Records\n4.Delete Records"); op = sc.nextInt(); switch(op){ case 1: rs = stm.executeQuery("Select * from student_table"); System.out.println("Enter RollNumber : "); i = sc.nextInt(); sc.nextLine(); System.out.pr...
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Java JDBC program to implement CRUD Operation without Updatable Resultset

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JDBC program to perform all CRUD operation on data stored in student table, containing the columns for roll_number number, name varchar2(50), and result in percentage without using Updatable resultset Code: package aj.pkg11; import java.sql.*; import java.util.*; public class AJ11 { public static void main(String args[])throws Exception{ int i=0 , op=0; Float r; String s = null,str = null; String ch = null; Class.forName("com.mysql.jdbc.Driver"); Connection cn = DriverManager.getConnection("jdbc:mysql://localhost:3306/student","root",""); Scanner sc= new Scanner(System.in); PreparedStatement pstm = cn.prepareStatement("Insert into student_table values (?,?,?)"); PreparedStatement dstm = cn.prepareStatement("Delete from student_table where Roll_Number = ?"); Statement ustm = cn.createStatement(); Statement stm = cn.createStatement(); do{ System.out.println("Which operation do you want to perform ?\n1.Create Records\n2.Re...
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Java program to demonstrate UDP Communication with example of country capital name

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Simple java program for UDP Communication where client will send name of country and server will return the capital of that country. Code: Server: package aj.pkg9; import java.io.*; import java.net.*; import java.util.HashMap; import java.util.Map; class Server { public static void main(String args[]) throws Exception { Map<String, String> map = new HashMap<String,String>(); map.put("INDIA", "DELHI"); map.put("NEPAL", "KATHMANDU"); map.put("SHRI-LANKA", "COLUMBO"); map.put("BANGLADESH", "DHAKA"); map.put("CHINA", "BEIJING"); DatagramSocket serverSocket = new DatagramSocket(1111); byte[] receiveData = new byte[1024]; byte[] sendData = new byte[1024]; while(true) { DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length); serverSocket.receive(receivePacket); String sentence = new String( receivePacket.getData(),0,5); InetAddress IPAddress = receiveP...
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Java client server program to read text file using Socket Programming

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Simple java network program in which client send a text file to server and server returns number of characters, lines, words and sentences of that file to client. Code: Server: package aj.pkg8; import java.net.*; import java.io.*; public class aj8server { public static void main (String [] args ) throws IOException { ServerSocket serverSocket = new ServerSocket(1111); Socket socket = serverSocket.accept(); File transferFile = new File ("sample.txt"); byte [] bytearray = new byte [(int)transferFile.length()]; FileInputStream fin = new FileInputStream(transferFile); BufferedInputStream bin = new BufferedInputStream(fin); bin.read(bytearray,0,bytearray.length); OutputStream os = socket.getOutputStream(); System.out.println("Sending Files..."); os.write(bytearray,0,bytearray.length); os.flush(); socket.close(); } } Client: package aj.pkg8; import java.net.*; import java.io.*; public class aj8client{ public static void main (String [] args) throws IOException { int ...
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Java Program to Implement sorting algorithm using TCP on Server application

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Simple Java program to Implement sorting algorithm using TCP on Server application Input: Give input on client side and client should receive sorted output from server and display sorted list on input(client) side. Note: You can implement any sorting algorithm by changing the sorting algorithm code on server side Code: Server: package aj.pkg7; import java.io.*; import java.net.*; import java.util.*; class Server { public static void main(String args[]) throws Exception { ServerSocket ss=new ServerSocket(1111); Socket s=ss.accept(); DataInputStream din=new DataInputStream(s.getInputStream()); DataOutputStream dout=new DataOutputStream(s.getOutputStream()); int r,i=0; int n=din.readInt(); int a[]=new int[n]; System.out.println("data:"); int count=0; for(i=0;i<n;i++) { a[i]=din.readInt(); } int number = a.length; for (int i1 = 0; i1 < number-1; i1++) for (int j1 = 0; j1 < number-i1-1; j1++) if (a[j1] > a[j1+1]) { int temp = a[j1]; a[j1] = a[j1+1]; a[j1+1] = temp; } ...
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Java code to implement Math Server with multi client support using socket programming

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Simple Java Math Server (Factorial, Fibonacci, Prime, and Palindrome) with multi client support using socket programming Code: Server: package javaapplication7; import java.io.*; import java.net.*; import java.util.Scanner; import java.lang.String; public class MyServer{ public static void main(String args[]){ try{ ServerSocket ss = new ServerSocket(1111); Socket s = ss.accept(); DataInputStream dis = new DataInputStream(s.getInputStream()); DataOutputStream dout=new DataOutputStream(s.getOutputStream()); dout.writeUTF("Math Server"); dout.writeUTF("Enter your option from below:"); dout.writeUTF("1.Factorial of the number"); dout.writeUTF("2.Fibonacci series "); dout.writeUTF("3.Check prime or not"); dout.writeUTF("4.Check the string is palindrome or not"); int option=Integer.parseInt(dis.readUTF()); switch(option){ case 1: { dout.writeUTF("Enter the number for factorial:");dout.flush(); int number=Integer.pars...
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Java chat application using TCP protocol for Client and Server

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Simple Java chat application using TCP protocol with coeds for Client and Server to send Messages in string format Code: Server Code: package clientserver; import java.io.*; import java.net.*; class server { public static void main(String[] args) throws Exception { ServerSocket sersock = new ServerSocket(3000); Socket sock = sersock.accept( ); BufferedReader keyRead = new BufferedReader(new InputStreamReader(System.in)); OutputStream ostream = sock.getOutputStream(); PrintWriter pwrite = new PrintWriter(ostream, true); InputStream istream = sock.getInputStream(); BufferedReader receiveRead = new BufferedReader(new InputStreamReader(istream)); String receiveMessage, sendMessage; while(true) { if((receiveMessage = receiveRead.readLine()) != null) { System.out.println("Client:"+receiveMessage); } sendMessage = keyRead.readLine(); pwrite.println(sendMessage); pwrite.flush(); } } } Client Code: package clientserver; import java.io.*; import java.net.*; public class client { publ...
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