Accept n numbers through one program send it to the server program check their for prime numbers send only the prime numbers to client-Java Socket program

tcpserver1.java

import java.io.*;
import java.net.*;
class tcpserver1
{
public static void main(String args[])throws Exception
{
ServerSocket ss = new ServerSocket(6856);
Socket cs=ss.accept();
BufferedReader br = new BufferedReader(new InputStreamReader(cs.getInputStream()));
PrintStream ps = new PrintStream(cs.getOutputStream());
int[] a=new int[15];
int[] b= new int [15];
int k=0,n,i,j,f=0;
n=Integer.parseInt(br.readLine());
for(i=0;i<n;i++)
a[i]=Integer.parseInt(br.readLine());
for(i=0;i<n;i++)
{
for(j=2;j<a[i];j++)
{
if(a[i]%j==0)
{
f=1;
break;
}
}
if(f==0)
{
if(a[i]!=1)
{
b[k]=a[i];
k++;
}
}
f=0;
}
ps.println(k);
for(i=0;i<k;i++)
ps.println(b[i]);

}
}

tcpclient1.java

import java.io.*;
import java.net.*;
class tcpclient1
{
public static void main(String args[])throws Exception
{
Socket cs = new Socket("localhost",6856);

BufferedReader kb = new BufferedReader(new InputStreamReader(System.in));
BufferedReader br = new BufferedReader(new InputStreamReader(cs.getInputStream()));
PrintStream ps = new PrintStream(cs.getOutputStream());
int[] a=new int[15];
int[] b= new int [15];
int k,n,i;
System.out.println("Enter the limit");
n=Integer.parseInt(kb.readLine());
ps.println(n);
System.out.println("Enter the Numbers");
for(i=0;i<n;i++)
a[i]=Integer.parseInt(kb.readLine());
for(i=0;i<n;i++)
ps.println(a[i]);
k=Integer.parseInt(br.readLine());
for(i=0;i<k;i++)
b[i]=Integer.parseInt(br.readLine());
System.out.println("Prime nos\n");
for(i=0;i<k;i++)
System.out.println(b[i]);

}
}

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Udp Client-Server Communication using java

UDP Client

import java.io.*;
import java.net.*;
class udpclient {
    public static void main(String args[])throws Exception
    {
       
        DatagramSocket cs = new DatagramSocket(2568);
        InetAddress ip = InetAddress.getByName("localhost");
        byte[] sD = new byte[1024];
        byte[] rD = new byte[1024];
 String sen;
        while(true)
        {
            BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
       sen= br.readLine();
      
       
        sD=sen.getBytes();
        DatagramPacket sPkt = new DatagramPacket(sD,sD.length,ip,6800);
        cs.send(sPkt);
        DatagramPacket rPkt = new DatagramPacket(rD,rD.length);
        cs.receive(rPkt);
        String str= new String(rPkt.getData());
        System.out.println("From Server:\n"+str);
        }
       
    }
   
}

UDP Server

import java.io.*;
import java.net.*;
class udpserver {
    public static void main(String args[])throws Exception
    {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        DatagramSocket cs = new DatagramSocket(6800);
       
        byte[] sD = new byte[1024];
        byte[] rD = new byte[1024];
        while(true)
        {
          DatagramPacket rPkt = new DatagramPacket(rD,rD.length);
        cs.receive(rPkt);
        String str= new String(rPkt.getData());
        System.out.println("From Client:\n"+str);
InetAddress ip = rPkt.getAddress();
int port = rPkt.getPort();  
        String sen= br.readLine();
       
       
        sD=sen.getBytes();
        DatagramPacket sPkt = new DatagramPacket(sD,sD.length,ip,port);
        cs.send(sPkt);
      
        }
       
    }
   
}

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