Vector of objects problem

Question

Hello All,
I am trying out a program which uses vector of objects.It is throwing an exception when I compile it.The aim of the program is.
for eg if we have a set of producers
count =5
P1 P2 P3 P4 P5
7 8 9 10 11
C1 C2 C3 C4 C5
1 2 3 4 5
store all those pairs of consumers and producers where (Ci <=Pi).
Hash table keys will be of the form S0,S1,S2..SN
in this Case SO should correspond to a vector which is (7 1),(8 1),(9,1),(10,1),(11,1)
similarly
S1 should be (8,1),(8,2) etc.
I have tried writing the code it doesnt work why.
Thanks.
Regards.
NP
import java.io.*;
import java.util.*;
import java.lang.StrictMath;
import java.util.ArrayList;
class CollectionCache
private final Map cache;
public CollectionCache()
cache=new Hashtable();
public Collection put(Object key,Collection value)
return(Collection)cache.put(key,value);
public Collection get(Object key)
return(Collection)cache.get(key);
public class Participant
boolean isProducer;
double value;
String name;
static double resources_used;
static int p=0;
static int q=0;
//static int[] final_index_pro=new int[100];
//static int[] final_index_con=new int[100];
public void set_is_pro_or_con(boolean ispro)
isProducer=ispro;
public boolean get_is_pro_or_con()
return isProducer;
public void set_is_pro_or_con_value(double value)
this.value=value;
public double get_is_pro_or_con_value()
return value;
public void set_is_pro_or_con_name(String name)
this.name=name;
public String get_is_pro_or_con_name()
return name;
public static void main(String args[]) throws IOException
ArrayList Producer=new ArrayList();
ArrayList Consumer=new ArrayList();
Collection c=new Vector();
int i;
BufferedReader console= new BufferedReader(new InputStreamReader(System.in));
System.out.println("Enter the number of resources you want to input");
String input=console.readLine();
int count=Integer.parseInt(input);
System.out.println(count);
for(i=0;i<count;i++)
Producer.add(i,new Participant());
for(i=0;i<count;i++)
Consumer.add(i,new Participant());
System.out.println("Reading values into producer array");
for(i=0;i<count;i++)
((Participant)Producer.get(i)).set_is_pro_or_con(true);
String t="P"+ i;
((Participant)Producer.get(i)).set_is_pro_or_con_name(t);
((Participant)Producer.get(i)).set_is_pro_or_con_value((int)(StrictMath.random()*10 + 1));
System.out.println("Reading values into consumer array");
for(i=0;i<count;i++)
((Participant)Consumer.get(i)).set_is_pro_or_con(true);
String t="P"+ i;
((Participant)Consumer.get(i)).set_is_pro_or_con_name(t);
((Participant)Consumer.get(i)).set_is_pro_or_con_value((int)(StrictMath.random()*10 + 1));
//Making Graph topology
System.out.println("producer array");
for(i=0;i<count;i++)
//System.out.println(dup_producer.get_is_pro_or_con());
//System.out.println(dup_producer[i].get_is_pro_or_con_name());
System.out.println(((Participant)Producer.get(i)).get_is_pro_or_con_value());
System.out.println("consumer array");
for(i=0;i<count;i++)
//System.out.println(dup_consumer[i].get_is_pro_or_con());
//System.out.println(dup_consumer[i].get_is_pro_or_con_name());
System.out.println(((Participant)Consumer.get(i)).get_is_pro_or_con_value());
System.out.println("Values Printed");
//String s;
CollectionCache cc=new CollectionCache();
int j=0;
while(j<count)
for(i=0;i<count;i++)
if( (((Participant)Consumer.get(j)).get_is_pro_or_con_value()) <= (((Participant)Producer.get(i)).get_is_pro_or_con_value()))
c.add(Double.toString((((Participant)Consumer.get(j)).get_is_pro_or_con_value())));
c.add(Double.toString((((Participant)Producer.get(i)).get_is_pro_or_con_value())));
final Object s="S" +j;
cc.put(s,c);
j++;
j=0;
while(j<count)
Collection value=cc.get("S" + j);
if(value!=null)
for(Iterator it=value.iterator(); ;it.next())
System.out.println(it.next().toString());
j++;

Answer 1

Or if you want to keep it in as small a scope as possible:
Iterator it = valu      e.iterator();
  while (it.hasNe                                                       xt()) {
    System.out.println(it
.next
}