How a java program accessable by another java program?

Dear all,
Iam had developed a program which talks to serial port. This program should be intergrated with another main java program . I don't want a function (subroutine )call to my program. i want any other methods to access my program by main java program , which should be fast.

You could serach for "interprocess communication". The main techniques available are pipes and share memory. This means that the two Java programs run as totally separated processes.
An easier way is to restructure the "serial port talking" program into a "utility package with an API" and integrate it with the "main" program. You could let the "serial port talker" run in it's own thread thus creating an illusion of total independency from "main".

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Hi all,
I have written a java card applet, in which i am using the Biometry API of java card to enroll a fingerprint template in java card. Code is attached below:
package classicapplet1;
import javacard.framework.*;
import javacardx.biometry.BioBuilder;
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     * @param apdu
     *            the incoming APDU
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Problem :
I have developed this program in Netbeans using java card plug ins. when i am running this program, all the required CAP files and EXP files are generated.
Now, i have to write this applet on java card through a card reader. My card reader is installed in an embedded system GeoAmida with IP 192.133.133.2 and port number 6789.
I have used the following settings for my java card device in Netbeans:
Host : 192.133.133.2
Server URL: http://192.133.133.2:6789/
Card Manager URL: http://192.133.133.2:6789/cardmanager/
HTTP port: 6789
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But the problem is how can i ensure that my applet is been successfully installed on the java card?
The code of host application program, accessing the developed java card applet is given below (it is written in C):
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <smartcard.h>
int main()
     int ret, i, smartcard;
     unsigned char applet_id[100], apdu_len, apdu[300],response[300]={0};
     smartcard_info *context;
     smartcard=CONTACTLESS;
     //smartcard=CONTACT_BOT;
     if((context = smartcard_init(smartcard)) == NULL){
          printf("Smartcard Initi. Failed\n");
          return 0xBB;
     /* checking for smartcard */
     while (1){
          if(ret=smartcard_is_present(context, smartcard)!=0)
               sleep(1);
          else
               break;
     printf("Selecting Applet \n");
     i = 0;
     applet_id[i++]=0x00; applet_id[i++]=0xA4; applet_id[i++]=0x04; applet_id[i++]=0x00; applet_id[i++]=0x06;
     applet_id[i++]=0xA9; applet_id[i++]=0xBF; applet_id[i++]=0xA2; applet_id[i++]=0xB6; applet_id[i++]=0xB1; applet_id[i++]=0x3E; applet_id[i++]=0x7F;
     if ((ret=smartcard_select_applet(context, smartcard, applet_id, i))!=0){
          printf("select applet failed %02x\n",ret);
          return ;
     printf("Applet Selection Success \n");
#if 1
     i=0;
     apdu[i++]=0xCF; apdu[i++]=0x10; apdu[i++]=0x04; apdu[i++]=0x04; apdu[i++]=0x7F;
     //apdu[i++]=0x3F; apdu[i++]=0x00;
     apdu_len = i;
     printf("Sending APDU command\n");
     if ((ret=smartcard_apdu(context, smartcard, apdu, apdu_len, response))!=0){
          printf("apdu failed %d\n",ret);
          //return;
     }else
          printf("APDU Success\n");
     //printf("\n");
#endif
     smartcard_deinit(context);
     return 0;
}The output of this program is showing me that applet is been successfully selected, but APDU selection failed. Please solve this problem as soon as possible, because my project is deadline is not very much far.
Thanks in advance.
Mukul Gupta

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Sorry, I think i did not express cearly. It is my fault.
I re-write my requirements again:
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Class AAA2.java,
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etc
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