import java.util.ArrayList;
import java.util.Scanner;

class Person{
        String name;
        String address;
        String email;
        int contactNo;

        Person(String name,String address,String email,int contactNo){
        this.name=name;
        this.address=address;
        this.email=email;
        this.contactNo=contactNo;
        }
        public String getName(){
                return name;
        }

        public String getAddress() {
                return address;
        }

        public String getEmail() {
                return email;
        }

        public int getContactNo() {
                return contactNo;
        }
       }

public class ArrayListEx {
  public static void main(String[] a) {
      Scanner input=new Scanner(System.in);
                ArrayList<Person> list = new ArrayList<Person>();
                list.add(new Person("A","Delhi","[email protected]",11111));
                list.add(new Person("B","Mumbai","[email protected]",22222));
                list.add(new Person("C","Chennai","[email protected]",33333));
                list.add(new Person("D","Kolkata","[email protected]",44444));
                boolean exit=false;
                for(Person data: list){
                System.out.println(data.getName()+"\t "+data.getAddress()+"\t "+data.getEmail()+"\t "+data.getContactNo());
                }
                do{
                System.out.println("1 Add Details");
                System.out.println("2 Exit");
                System.out.print("Enter your choice: ");
                int choice=input.nextInt();
                switch(choice){
                case 1:
                  System.out.print("Enter name: ");
                  String name=input.next();

                  System.out.print("Enter address: ");
                  String address=input.next();

                  System.out.print("Enter email: ");
                  String email=input.next();

                  System.out.print("Enter contactNo: ");
                  int contactNo=input.nextInt();

                  list.add(new Person(name,address,email,contactNo));

                  for(Person data: list){
                     System.out.println(data.getName()+"\t "+data.getAddress()+"\t "+data.getEmail()+"\t "+data.getContactNo());
                  }
                  break;

                  case 2 :
                     exit=true;
                     System.exit(0);
                     break;
                 default: 
                     System.out.println("Invalid Selection!");
                }
                }
                while(!exit);
        }
}

Very Thanks. It is useful to me. Thanks for ur reply.