Thread: passing object and storing

hi ,
I three classes .I am passing an object from class node to class mainhandler's method mtd(int object). and want it to be stored in an array ,its not working

public class mainhandler {
public node[] n;
 public static int a;
 
	public static void main(String[] args) {
 
 
		node[] n=new node[0];
 
 
	}
	public int mtd(int a,packet pobj)
{ 
		n[0].packet[0]=pobj; .......................................................>i can not assign pobj to array here
		return a=a+ pobj.interval;
}}
 
public class node {
int b;
	node[] packet=new node[0];
 
	public void add(){
 
 
	 packet pobj=new packet(1,2,3);
	 mainhandler obj=new mainhandler();
	obj.mtd(2,pobj);
 
 
}
 
}
 
public class packet {
 
int type;
int interval;
int senderID;
 
public packet(int a,int b,int c)
{
	type=a;
	interval=b;
	senderID=c;
}
 
 
}

Objects are never passed, only their reference is.

How many times do people have to be told "it's not working" provides zero information? Do you get errors? Then post the exact message. Does it have incorrect behviour/output? Then show what it does do and what it shoudl do instead.

Looks like a scope problem. Make sure the variables you use are defined at the scope where you are using them.

Even if initialize node objects ,i still find the same problem

Error: Type mismatch: cannot convert from packet to node

public static void main(String[] args) {
	n=new node[1];
	n[0]=new node();
	n[1]=new node();

Please copy and paste here the full text of the error message. It has valuable information in it that Your edited version left out.

I already told you why you get that error - the array called 'packet' in the node class is an array of nodes, not an array of packets, so you can't add a packet to it. A packet is not a node.

If you followed the Java Naming Conventions as I suggested, you'd probably be less confused and you might not make such a mistake.

what i am trying to do is to assign each node an array named packet and to store packet object in that array so that i can be called by node.packet .

waht can be an apropriate memory allocation in the node class to store objects of packet type that can be called from main class..

array named packet and to store packet object

Your namings make for a problem. Class names should start with a Capital letter.

waht can be an apropriate memory allocation in the node class to store objects of packet type that can be called from main class

class Node {
  Packet aPacket;  // Store Packet object here
  ...
  public Packet getPacket() {  // This method can be called from Main class to get Packet object
    return aPacket;
  }
 ...

even if i do that my problem remains the same .. i am looking to store my packet object `pobj`in an array that is unique for each node (i.e n[0] and n[1] )
i have defined an array in the Node class so that i can access it like n[0].pkt[0] = store object here.
Please modify my code or tell me how to store it

 
 
 
public class Control {
public static Node[] n;
 
public static void main(String[] args) {
 
 
 
	n=new Node[0];
	n[0]=new Node();
 
	Node aa=new Node();
	 aa.add();
 
	} 
	public int mtd(int a,Packet pobj)
{		n[0].pkt[0]=pobj;
		return a+pobj.type ;
 
 
}
	}
 
public class Node {
 
 
	  Packet[] pkt=new Packet[0];
 
	public void add(){
 
 
		Packet pobj=new Packet(1,2,3);
	 System.out.println(pobj.type);
	 System.out.println(pobj.interval);
	 System.out.println(pobj.senderID);
	 Control obj=new Control();
	 int b=obj.mtd(2,pobj);
		 System.out.println(b);
 
}
 
}
 
public class Packet {
 
int type;
int interval;
int senderID;
 
public Packet(int a,int b,int c)
{
	type=a;
	interval=b;
	senderID=c;
}
 
public Packet(){
 
}
}

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 0
at mainhandler.main(mainhandler.java:10)

.ArrayIndexOutOfBoundsException: 0

What code is at line 10?
The array was defined with 0 elements! There is no 0th element.

yea i figured that out.thanks making array of packet type works fine