Stack Example

import javax.jws.soap.SOAPBinding;
import java.util.Stack;

public class StackExample {

    public static void main(String[] args) {

        Stack<User> stack = new Stack<>();

        stack.push(new User("John", "Doe", "johndoe@gmail.com"));
        stack.push(new User("John", "Doe", "johndoe@gmail.com"));
        stack.push(new User("Crosse", "Michel", "crosse@gmail.com"));

        System.out.println(stack.peek().getName() + " " + stack.peek().getSurname() + " " + stack.peek().getEmail());
        System.out.println();

        User user = stack.firstElement();//TODO explain

        User lastUser = stack.lastElement();//TODO explain

        User specificUser = stack.elementAt(2);//TODO explain

        User specificUserTwo = stack.get(2);//TODO explain

        stack.insertElementAt(new User("Reynold", "Jakson", "reynold@gmail.com"), 2);
        //TODO check what will print for index 2 !

        if (!stack.empty()) {
            int searchedUser = stack.search(new User("Reynold", "Jakson", "reynold@gmail.com"));
            //TODO what will return search function , and what will happen if you remove equals method in User class ?
            User foundUser = stack.get(searchedUser);
            System.out.println("found user " + foundUser.getName() + " " + foundUser.getSurname() + " " + foundUser.getEmail());
        }


        stack.addElement(new User("John","Aghton","john@gmail.com"));

        stack.removeElementAt(3);
        //stack.removeAllElements();TODO commented bcs reasons ...
        //stack.remove((new User("John","Aghton","john@gmail.com")));TODO commented bcs reasons ...

        System.out.println();
        System.out.println("is stack empty ? - " + stack.isEmpty());

        System.out.println("capacity of stack = " + stack.capacity());
        System.out.println();

       // stack.setSize(100);TODO set fixed size of stack if needed


        System.out.println(stack.pop().getName() + " " + stack.pop().getSurname() + " " + stack.pop().getEmail());
        //TODO why is giving this output ??
       //TODO difference between peek & pop ?
    }

}


class User {
    private String name;
    private String surname;
    private String email;

    public User(String name, String surname, String email) {
        this.name = name;
        this.surname = surname;
        this.email = email;
    }

    public String getName() {
        return name;
    }

    public String getSurname() {
        return surname;
    }

    public String getEmail() {
        return email;
    }

    @Override
    public boolean equals(Object o) {
        if (o == null){
            return false;
        }
        if (o.getClass() != getClass()){
            return false;
        }
        User user = (User) o;
        return name.equals(user.name) && surname.equals(user.surname) && email.equals(user.email);
    }
}