• Generics: A generic type is a generic class or interface that uses type parameters
  • Raw Type : Vector vector1 = new Vector()
  • Parameterized Type :
    Vector<String> vector1 = new Vector<String>()
    List<String> list = new ArrayList<String>();

Entry Point with main method:( image splitted into two)

import java.io.*;
import javax.swing.JOptionPane;
import java.net.URI; 
import java.util.*;

public class ClassTemplate1 {

 public ClassTemplate1() {
		// TODO Auto-generated constructor stub	
	}
public static void main(String[] args) 
		throws Exception {
		// TODO Auto-generated method stub]
	try {
	//Without Generic
	List alist = new ArrayList();
	alist.add("hello");// at  index 0
	alist.add(123); // at index 1
	int n1 = (int)alist.get(1); //casting integer
	String s1 = (String) alist.get(0);//casting string
	System.out.println("--->- printing non-generic");
	System.out.println("\t printing variables: after casting ");
	System.out.print("\t"+s1 + " , " +  n1 ); 
	System.out.println("");
	System.out.println("Non-Gereic : print with iterator::indexed");
	Process.roller(alist);// calling a method 
	 //with Generic
	List<Object>  olist = new ArrayList<Object>();
	olist.add("a string as : Hello");
	olist.add("string and int "+ 123);
	olist.add( 456 );
	Object s2 = olist.get(0);   // no cast
	Object s3 = olist.get(1); 
	Object s4 = olist.get(2);
	//displaying data 
	System.out.println("");
	System.out.println("---->> print generics : ");
	System.out.println("\t printing variables :no casting");
	System.out.print("\t"+s2 + " " +  s3 + " " +s4);
	System.out.println("");
	System.out.println("Generics :print with iterator::indexed");
	Process.roller(olist);
	//
  } catch (NumberFormatException exc) { 
	  //Process
	  }
   }
}// end of class template 
//
//Processing with ListIterator
class Process
{
public Process() { 
System.out.println("Process outer constructor");
}
	
   public static void roller(List<Object>   list)
   {
 ListIterator<Object>  iter = list.listIterator();          
 System.out.print("\t");
 while(iter.hasNext())
 { System.out.print(iter.nextIndex()+
 " : " + iter.next() +", ");   
	   } 
   }
}