I have employee class that displays employee information based on id .

class employee
{
int id;
String name;
String State;
String City;
String Area;
}


Now i need to display **employee name** based on state ,city,area present in the employee class how to achive this in java and swing any suggestion would be useful. i.e when i select state it should display all states present in employee class then when i select state it should display all city present in the class corresponding to that state ,then it should display area corresponding to that city in that class.





import java.util.ArrayList;
import java.io.*;

public class Employeelookup {

static ArrayList<Employeelookup> al = new ArrayList<Employeelookup>();
int id;
String name;
String State;
String city;
String Area;

static int count = 0;
{ 
}
Employeelookup()
{ 
}
Employeelookup(int id, String name, String State,String city,String Area)
{
this.id = id;
this.name = name;
this.State=State;
this.city=city;
this.Area=Area;

count++;
}
public void putDetails(Employeelookup e)
{
al.add(e);

}

public Employeelookup getDetails(int id)
{
Employeelookup es = (Employeelookup)al.get(id);
return es;
}

public static void main(String[] args ) throws IOException
{

BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

Employeelookup e = new Employeelookup();
Employeelookup e1 = new Employeelookup(1, "SaiRam", "karnataka","bangalore","rajajinagar");
Employeelookup e2 = new Employeelookup(2, "Anu", "karnataka","mysore","temple road");
Employeelookup e3 = new Employeelookup(3, "Vasu", "karnataka","bangalore","rajajinagar");
Employeelookup e4 = new Employeelookup(4, "Shillu", "Tamil Nadu","madhurai","b");
Employeelookup e5 = new Employeelookup(5, "Madhu", "Karnataka","shimoga","bus stop");
Employeelookup e6 = new Employeelookup(6, "Volga", "Andra","abc","railway stop");


e.putDetails(e1);   
e.putDetails(e2);
e.putDetails(e3);
e.putDetails(e4);
e.putDetails(e5);
e.putDetails(e6);

System.out.println("The total number of Employeelookups are: " +count);
System.out.println(" ");

while(true)
{
System.out.println("Enter Employeelookup id to get the Employeelookup details: ");
int id = Integer.parseInt(br.readLine());
boolean flag = false;


for(int i=0; i <al.size();i++)   {
Employeelookup es = e1.getDetails(i);
if(id == es.id)
{
System.out.println("The details of the Employeelookup with id " +id +" is: ");
System.out.print(es.id +" " +es.name+" " +es.State);
flag = true;
break;
}
}

System.out.println(" ");

if(!flag)
{
System.out.println(" no data exists with the id " +id);
}
System.out.println(" ");
String ch = null;

while(true)
{
System.out.println("Want to Continue(y/n)?)");
System.out.println(" ");
ch = br.readLine();
if(ch.equalsIgnoreCase("y") || ch.equalsIgnoreCase("n")) break;
if(!(ch.equalsIgnoreCase("y") || ch.equalsIgnoreCase("n")))
{
System.out.println("Invalid option : please type y/n");
System.out.println(" ");
}
}`print("code sample");`

    print("code sample");

if(ch.equalsIgnoreCase("n"))
{
System.out.println(" ");
System.out.println("exit");
break;
} 
}
}
}