How to code a very simple user login in Java?

I'm doing a coding exercise where I'm basically building a little shop application and I'm very very new to Java

I'm having some trouble though, I want to write a method called setPrice() that allows a user to change the price of a Content object by logging in and declaring a price

This is the Admin class (it extends user, I'll include that too). The Admin class has some commented out code that I tried to use to invoke the login (I'm not sure this is the right way to go about this though:

import java.util.Scanner;

public class Admin extends User {
	
	//class attributes
	String password;
	int privilegeLevel;
	boolean loggedIn;
	Scanner console = new Scanner(System.in);
	
	public Admin(String id, String name, String pass, int level) {
		super(id, name);
		password = pass;
		privilegeLevel = level;
	}
	
	public String getPassword() {
		return password;
	}
	
	public int getLevel() {
		return privilegeLevel;
	}
	
//	public void login() {
//		System.out.println("Please enter your password.");
//		String passwordAttempt = console.next();
//		
//		if (password.contentEquals(passwordAttempt)) {
//			System.out.println("Log in successful");
//			loggedIn = true;
//		}else {
//			loggedIn = false;
//		}
//	}

}

public abstract class User {
	//Content Attributes
	private String ID;
	private String userName;
	
	public User(String id, String name) {
		ID = id;
		userName = name;
	}
	
	public void changeName(String newName) {
		this.userName = newName;
		
	}
	
	public String getUserID() {
		return ID;
	}
	
	public String getUsername() {
		return userName;
	}
	

	
}

The piece of code I've been given that's supposed that has to invoke the setPrice() method looks like this: b1.setPrice(a2.login(), 14.25);. Where b1 is a Book which is an extension of the Content class:

public abstract class Content {

	// Content Attributes
	private String contentName;
	private String contentID;
	private double contentPrice;
	private int downloadCount= 0;
	private Comment[] comments = new Comment[100];
	private int commentCount = 0;

	// Constructor
	public Content(String ID, String Name, double price) {
		this.contentID = ID;
		this.contentName = Name;
		this.contentPrice = price;

	}

	public Content(String ID, String Name) {
		this.contentID = ID;
		this.contentName = Name;
		this.contentPrice = 0;

	}

import java.util.ArrayList;

public class Book extends Publication{
	//attributes
	private String[] authorNames;
	
	
	// constructor
	public Book(String ID, String name, double price, String publisher, int numberPages, String[] authors1){
		super(ID, name, price, publisher, numberPages);
		this.authorNames = authors1;
	}

	// accessor methods
	public String[] getAuthorName() {
		return authorNames;
	}
	
	public String[] getAuthorNames() {
		return authorNames;
	}
	}

Basically I can work out what to write within the method, I just can't work out how to let the method accept a2.login() as a parameter?

You can modify your login() code as below :

public boolean isloggedIn() {
      System.out.println("Please enter your password.");
      String passwordAttempt = console.next();

      if (password.contentEquals(passwordAttempt)) {
          System.out.println("Log in successful");
          loggedIn = true;
      }else {
          loggedIn = false;
      }
      return loggedIn;
  }

And your setPrice() method as below :

void setPrice(boolean isLoggedIn, Double value)
  {
      if(isLoggedIn)
      {
          //set the price
      }
  }

Then you can call:

b.setPrice(a2.isloggedIn(), 14.25);