Before generics, we can hold any type of objects but in generics it is strictly to use only the type(String, Integer, Float etc) you want to store.

For simplicity, I'm going to use ArrayList.

Syntax :

      Class or Interface<Type>

Example : 

      ArrayList<String>

Code Snippet :  

import java.util.*;

class TestGenerics1{

    public static void main(String args[]){

     ArrayList arrayListGenerics = new ArrayList();
    
     //storing values to arrayListGenerics object
     arrayListGenerics.add("praveen");
     arrayListGenerics.add("naveen");
     arrayListGenerics.add("ajith");
     arrayListGenerics.add("gopal");
    //arrayListGenerics.add(32);//compile time error

    String myValues = arrayListGenerics.get(1);//No need for type casting
    System.out.println("Data is : "+myValues);

    Iterator itr = arrayListGenerics.iterator();

    while(itr.hasNext()){

         System.out.println(itr.next());
     }
   }
}

OUTPUT :

Data is : naveen
praveen
naveen
ajith
gopal