Java Codes Basic to Advance
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// Factotial from recursion in java
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner s = new Scanner(System.in);
System.out.print("Enter Number: " );
int n = s.nextInt();
if(n>26)
System.out.print("Please enter number less than 25\n" );
else{
System.out.println("Showing factorial for "+ n + " Number" );
Main.f(n, 1);
System.out.print("\n" +Main.f(n));
}
}
// Factorial value calculation
static long f(long n){
if (n==1){
return n;
}
else{
return n*f(n-1);
}
}
// Factorial series printing method
static void f(int n,int h ){
if (n==h){
System.out.print(h);
}
else{
f(n, h+1);
System.out.print(" * " + h);
}
}
} // Java_Codes_Pro
Java Chat Code(2 Program sent Copy both (Server Code and Client Code) run And Practice with them)
import java.io.*;
import java.net.*;
public class Client {
Socket socket;
BufferedReader br;
PrintWriter out;
public Client() {
try {
System.out.println("Connecting to the client..");
socket = new Socket("127.0.0.1", 7777);
System.out.println("Connection successfull..");
br = new BufferedReader(new InputStreamReader(socket.getInputStream()));
out = new PrintWriter(socket.getOutputStream());
startReading();
startWritting();
} catch (Exception e) {
System.out.println("Error: Firstly run Server Code");
}
}
public void startReading() {
// thread reading
Runnable r1 = () -> {
System.out.println("Reader started..");
try {
while (true) {
String msg = br.readLine();
if (msg.equals("exit")) {
System.out.println("Server terminated the chat, Please press enter to free port");
socket.close();
break;
}
System.out.println("Server: " + msg);
}
} catch (Exception e) {
System.out.println("Connection Closed");
}
};
new Thread(r1).start();
}
public void startWritting() {
// thread sending data
Runnable r2 = () -> {
System.out.println("Writter started..");
String content = "";
try {
while (!socket.isClosed()) {
BufferedReader br1 = new BufferedReader(new InputStreamReader(System.in));
content = br1.readLine();
out.println(content);
out.flush();
if (content.equals("exit")) {
System.out.println("You terminated the chat");
socket.close();
break;
}
}
} catch (Exception e) {
if (content.equals("exit")) {
System.out.println("Connection Closed successfully");
}
else{
System.out.println("Connection terminated unsuccssefully \nTermnate all existing cmd's or check other errors");
}
}
};
new Thread(r2).start();
}
public static void main(String[] args) {
System.out.println("Going to start Client..");
new Client();
}
}
import java.net.*;
import java.io.*;
class Server {
ServerSocket server;
Socket socket;
BufferedReader br;
PrintWriter out;
// Constructor
public Server() {
try {
server = new ServerSocket(7777);
System.out.println("Server is ready to accept connection");
System.out.println("Waiting for client");
socket = server.accept();
br = new BufferedReader(new InputStreamReader(socket.getInputStream()));
out = new PrintWriter(socket.getOutputStream());
startReading();
startWritting();
}
catch (Exception e) {
e.printStackTrace();
}
}
public void startReading() {
// thread reading
Runnable r1 = () -> {
System.out.println("Reader started..");
try {
while (true) {
String msg = br.readLine();
if (msg.equals("exit")) {
System.out.println("Client terminated the chat, Please press enter to free port");
socket.close();
break;
}
System.out.println("Client: " + msg);
}
} catch (Exception e) {
System.out.println("Connection Closed");
}
};
new Thread(r1).start();
}
public void startWritting() {
// thread sending data
Runnable r2 = () -> {
System.out.println("Writter started..");
String content = "";
try {
while (!socket.isClosed()) {
BufferedReader br1 = new BufferedReader(new InputStreamReader(System.in));
content = br1.readLine();
out.println(content);
out.flush();
if (content.equals("exit")) {
System.out.println("You terminated the chat");
socket.close();
break;
}
}
}
catch (Exception e) {
if (content.equals("exit")) {
System.out.println("Connection Closed successfully");
}
else{
System.out.println("Connection terminated unsuccssefully \nTermnate all existing cmd's or check other errors");
}
}
};
new Thread(r2).start();
}
public static void main(String[] args) {
System.out.println("This is server.. going to start server");
new Server();
}
}
// File input Output Byte stream : Advance Java
// Warning : to use this code please change following path
import java.io.*;
public class filecount {
public static void main(String[] args) throws IOException {
FileInputStream inStream = new FileInputStream(
"C:\\Users\\mynms\\Desktop\\BCA\\Code\\Java2\\unit 4\\ReadFrom.txt");
FileOutputStream outStream = new FileOutputStream(
"C:\\Users\\mynms\\Desktop\\BCA\\Code\\Java2\\unit 4\\SendTo.txt");
// Reads byte at a time, it reached end of the file, returns -1
int content;
int whitespaces = 0;
int fullstops = 0, chars = 0, words = 0;
try {
while ((content = inStream.read()) != -1) {
outStream.write((byte) content);
if(' ' == content)
whitespaces = whitespaces + 1;
if('.' == content)
fullstops += 1;
if(content > 64 && content < 91 || content > 96 && content < 124)
chars += 1;
else
words += 1;
}
System.out.println("Whitespaces: " + whitespaces + "\nCharacters: " + chars + "\nFullstops: " + fullstops + "\nWords: "+ words);
System.out.println("File transfer conpleted successfully");
} finally{
if (inStream != null)
inStream.close();
if (outStream != null)
outStream.close();
}
}
} // @Java_Codes_Pro
// File input Output Byte stream : Advance Java
// Warning : to use this code please change following path
import java.io.*;
public class File {
public static void main(String[] args) throws IOException {
FileInputStream inStream = new FileInputStream(
"C:\\Users\\mynms\\Desktop\\BCA\\Code\\Java2\\unit 4\\ReadFrom.txt");
FileOutputStream outStream = new FileOutputStream(
"C:\\Users\\mynms\\Desktop\\BCA\\Code\\Java2\\unit 4\\SendTo.txt");
// Reads byte at a time, it reached end of the file, returns -1
int content;
try {
while ((content = inStream.read()) != -1) {
outStream.write((byte) content);
}
System.out.println("File transfer conpleted successfully");
} finally{
if (inStream != null)
inStream.close();
if (outStream != null)
outStream.close();
}
}
} // @Java_Codes_Pro
// Serialization - Deserialization Advance java concept
// Warning : for using this code change path of 'filename' (written below in Serializ class) to your file path
import java.io.*;
class Student implements Serializable {
private static final long serialVersionUID = 1L;
private String name;
private int age;
private String address;
// transient int x; if we create this then this will be no serialized
public Student(String name, int age, String address) {
this.name = name;
this.age = age;
this.address = address;
;
}
public void setName(String name) {
this.name = name;
}
public void setAge(int age) {
this.age = age;
}
public void setAddress(String address) {
this.address = address;
}
public String getName() {
return name;
}
public int getAge() {
return age;
}
public String getAddress() {
return address;
}
public String get(String z){
return z;
}
public int get(int age){
return age;
}
@Override
public String toString() {
return ("Student name is " + this.getName() + ", age is " + this.getAge() + ", and address is "
+ this.getAddress());
}
}
public class Serializ {
public static void main(String[] args) {
Student student = new Student("Sid", 19, "UP India");
FileOutputStream fileOut = null;
ObjectOutputStream objOut = null;
String filename = "C:\\Users\\mynms\\Desktop\\BCA\\Code\\Java2\\unit 4\\Test.txt";
// Serialization
try {
fileOut = new FileOutputStream(filename);
objOut = new ObjectOutputStream(fileOut);
objOut.writeObject(student);
objOut.close();
fileOut.close();
System.out.println("Object has been serialized: " + student);
} catch (Exception e) {
System.out.println("Not Serialized");
}
// Deserialization
FileInputStream fileIn = null;
ObjectInputStream objIn = null;
try {
fileIn = new FileInputStream(filename);
objIn = new ObjectInputStream(fileIn);
Student object = (Student) objIn.readObject();
System.out.println("Object has been deserialized " + object);
objIn.close();
fileIn.close();
} catch (IOException e) {
System.out.println("IO Exception " + e);
}
catch(ClassNotFoundException e){
System.out.println("Class not found exception " + e);
}
}
} // @Java_Codes_Pro
//enum code for advance java
enum Day{
SUN("sunday"), MON("monday"), TUE("tuesday"), WED("wednesday"), THU("thursday"), FRI("friday"), SAT("saturday");
public String Valu;
Day(String valu){
this.Valu = valu;
}
public String getValue(){
return Valu;
}
}
public class Main {
public static void main(String[] args) {
Day d = Day.MON;
System.out.println("Enum name: " + d.name() + " Value is " + d.getValue());
for(Day e: Day.values()){
System.out.println(e.name() + " " +e.getValue());
}
}
} // @Java_Codes_pro
