Java/com/study/demo9/PermissionSystem.java

package com.study.demo9;


public class PermissionSystem {
    public static void main(String[] args) {
        User admin = new User("admin", "admin");
        User guest = new User("guest", "guest");

        System.out.println("Admin can delete: " + admin.checkPermission("delete"));
        System.out.println("Admin can read: " + admin.checkPermission("read"));
        System.out.println("Guest can read: " + guest.checkPermission("read"));
        System.out.println("Guest can delete: " + guest.checkPermission("delete"));
    }
}

class User {
    private String username;
    private String role;

    public User(String username, String role) {
        this.username = username;
        this.role = role;
    }

    public boolean checkPermission(String operation) {
        PermissionChecker checker = new PermissionChecker();
        return checker.hasPermission(operation);
    }

    class PermissionChecker {
        boolean hasPermission(String operation) {
            if ("admin".equals(role)) {
                return true;
            } else if ("guest".equals(role)) {
                return "read".equals(operation);
            }
            return false;
        }
    }
}