server.java

java thread using bank java thread using bank java thread using bank java thread using bank java

import java.io.DataInputStream;
import java.io.PrintStream;
import java.net.ServerSocket;

/*
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 * and open the template in the editor.
 */
import java.net.Socket;

/**
 *
 * @author root
 */
public class Server {
    public static void main(String[] args) throws Exception
    {
        new Listener();
    }

}

interface Intf
{
    public String withdraw(int amt);
    public String deposit(int amt);
    public String balance();
}

class Listener extends Thread implements Intf
{
    public Bank B;

    public Listener()
    {
     	B=new Bank();
     	B.login(12345,(short)5555);
        start();
    }

    public String withdraw(int amt)
    {
    	String s="";
    	if(B.lock){
    		while(B.lock);}
    	B.lock=true;
   		s=B.withdraw(amt);
   		B.lock=false;
   		return s;
    }
    public String balance()
    {
    	return B.getBal();
    }

    public String deposit(int amt)
    {
    	String s="";
    	if(B.lock){
    		while(B.lock);}
    	B.lock=true;
   		s=B.deposit(amt);
   		B.lock=false;
   		return s;
    }
    public void run()
    {
       try{
           ServerSocket ss=new ServerSocket(5555);
           while(true){
           new Reader(this,ss.accept());
           }
       }catch(Exception e){}
    }
}

class Reader extends Thread
{
    Socket S;
    Intf N;
    public Reader(Intf n,Socket s)
    {
        S=s;
        N=n;
        start();
    }
    public void run()
    {
        try{
            PrintStream out=new PrintStream(S.getOutputStream());
            DataInputStream in=new DataInputStream(S.getInputStream());
            while(true){
            int opt=Integer.parseInt(in.readLine());
            if(opt==1)
            {
            	int amt=Integer.parseInt(in.readLine());
                out.println(N.deposit(amt));
            }
            else if(opt==2)
            {
            	int amt=Integer.parseInt(in.readLine());
	            out.println(N.withdraw(amt));
            }
            else if(opt==3)
            {
	            out.println(N.balance());
            }
            else
            	break;
            }
            in.close();
            out.close();
        }catch(Exception e){}
    }
}