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import java.net.*;
import java.io.*;
 
public class chatserver
{
public static void main(String args[]) throws Exception
{
ServerSocket ss=new ServerSocket(2000);
Socket sk=ss.accept();
BufferedReader cin=newBufferedReader(newInputStreamReader(sk.getInputStream()));
PrintStream cout=new PrintStream(sk.getOutputStream());
BufferedReader stdin=new BufferedReader(new InputStreamReader(System.in));
String s;
while ( true )
{
s=cin.readLine();
if (s.equalsIgnoreCase("END"))
{
cout.println("BYE");
break;
}
System. out.print("Client : "+s+"\n");
System.out.print("Server : ");
s=stdin.readLine();
cout.println(s);
}
ss.close();
sk.close();
cin.close();
cout.close();
stdin.close();
}
}
 
public class chatclient
{
public static void main(String args[]) throws [...]

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import java.net.*;
import java.io.*;
public class server
{
public static void main(String args[]) throws Exception
{
ServerSocket ss=new ServerSocket(2000);
Socket s=ss.accept();
BufferedReader br=new BufferedReader(newInputStreamReader(s.getInputStream()));
double rad,area;
String result;
rad=Double.parseDouble(br.readLine());
System.out.println("From Client : "+rad);
area=Math.PI*rad*rad;
result="Area is "+area;
PrintStream ps=new PrintStream(s.getOutputStream());
ps.println(result);
br.close();
ps.close();
s.close();
ss.close();
}
}
public class client
{
public static void main(String args[]) throws Exception
{
 
Socket s=new Socket("192.168.0.19",2000);
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
String rad;
System.out.println("Enter radius of the circle ");
rad=br.readLine();
PrintStream ps=new PrintStream(s.getOutputStream());
ps.println(rad);
BufferedReader fs=newBufferedReader(new InputStreamReader(s.getInputStream()));
String result=fs.readLine();
System.out.println("From Server : "+result);
br.close();
fs.close();
ps.close();
s.close();
}
}

Output:
Java client
Enter [...]

Write a Java program that correctly implements producer consumer problem using the concept of inter thread communication.

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class Q
{
int n;
boolean valueSet=false;
synchronized int get()
{
if(!valueSet)
try
{
wait();
}
catch(InterruptedException e)
{
System.out.println("Interrupted Exception caught");
}
System.out.println("Got:"+n);
valueSet=false;
notify();
return n;
}
synchronized void put(int n)
{
if(valueSet)
try
{
wait();
}
catch(InterruptedException e)
{
System.out.println("Interrupted Exception caught");
}
this.n=n;
valueSet=true;
System.out.println("Put:"+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 ProdCons
{
public static void main(String[] args)
{
Q q=new [...]