Орхан Гасанлы

import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

public class URLChecker {

  public static int checkUrl(String currentUrl) {
    URL checkUrl = null;
    HttpURLConnection http = null;
    int statusCode = 0;
    try {
      checkUrl = new URL(currentUrl);
    } catch (MalformedURLException e) {
      e.printStackTrace();
    }
    try {
      if (checkUrl != null) {
        http = (HttpURLConnection)checkUrl.openConnection();
      }
    } catch (IOException e) {
      e.printStackTrace();
    }
    try {
      if (http != null) {
        statusCode = http.getResponseCode();
      }
    } catch (IOException e) {
      e.printStackTrace();
    }
    return statusCode;
  }
}

Подойдет ли MacBook и в целом система Mac OS для программирования на Java?

Возможно ли пройти путь от полного неуча до Senior Software Java Developer на Маке или так без Windows не обойтись?

Если все таки, если я хочу программировать на Mac OS, то мне стоит больше присмотреться к той же iOS разработке?

*Обратите внимание: переменные с final - это константы. При этом их принято писать заглавными буквами - тут CamelStyle не работает :

In java, making something final means that it can't be reasigned to another reference to another instance, but if it's a reference to a mutable class, the mutable values inside the class can still be modified.

For example, a final String is a constant because Strings are immutable in Java, but a final ArrayList means that you cannot assign it to another ArrayList, but you can still add and remove elements to that ArrayList

Есть приложение, читающее файлы из файловой системы и загружающее в БД часть содержимого.

Есть сервисные классы, в них ряд методов, но возвращаемые типы в методах повторяются.

Хотелось бы сделать без спринг шелла, без команд в мейне.

-----------------------------------com.example.Example.java-----------------------------------

package com.example;

import java.util.List;
import javax.annotation.Generated;
import com.google.gson.annotations.Expose;
import com.google.gson.annotations.SerializedName;

@Generated("jsonschema2pojo")
public class Example {

@SerializedName("total_count")
@Expose
public Long totalCount;
@SerializedName("incomplete_results")
@Expose
public Boolean incompleteResults;
@SerializedName("items")
@Expose
public List<Item> items = null;

}
-----------------------------------com.example.Item.java-----------------------------------

package com.example;

import javax.annotation.Generated;
import com.google.gson.annotations.Expose;
import com.google.gson.annotations.SerializedName;

@Generated("jsonschema2pojo")
public class Item {

@SerializedName("id")
@Expose
public Long id;
@SerializedName("node_id")
@Expose
public String nodeId;
@SerializedName("name")
@Expose
public String name;
@SerializedName("full_name")
@Expose
public String fullName;
@SerializedName("private")
@Expose
public Boolean _private;
@SerializedName("owner")
@Expose
public Owner owner;
@SerializedName("html_url")
@Expose
public String htmlUrl;
@SerializedName("description")
@Expose
public String description;
@SerializedName("fork")
@Expose
public Boolean fork;

}
-----------------------------------com.example.Owner.java-----------------------------------

package com.example;

import javax.annotation.Generated;
import com.google.gson.annotations.Expose;
import com.google.gson.annotations.SerializedName;

@Generated("jsonschema2pojo")
public class Owner {

@SerializedName("login")
@Expose
public String login;
@SerializedName("id")
@Expose
public Long id;
@SerializedName("node_id")
@Expose
public String nodeId;
@SerializedName("avatar_url")
@Expose
public String avatarUrl;
@SerializedName("gravatar_id")
@Expose
public String gravatarId;
@SerializedName("url")
@Expose
public String url;
@SerializedName("html_url")
@Expose
public String htmlUrl;
@SerializedName("followers_url")
@Expose
public String followersUrl;
@SerializedName("following_url")
@Expose
public String followingUrl;
@SerializedName("gists_url")
@Expose
public String gistsUrl;
@SerializedName("starred_url")
@Expose
public String starredUrl;
@SerializedName("subscriptions_url")
@Expose
public String subscriptionsUrl;
@SerializedName("organizations_url")
@Expose
public String organizationsUrl;
@SerializedName("repos_url")
@Expose
public String reposUrl;
@SerializedName("events_url")
@Expose
public String eventsUrl;
@SerializedName("received_events_url")
@Expose
public String receivedEventsUrl;
@SerializedName("type")
@Expose
public String type;
@SerializedName("site_admin")
@Expose
public Boolean siteAdmin;

}

@Entity
@Data
@Table(name = "users")
@Builder
@AllArgsConstructor
@NoArgsConstructor
@EqualsAndHashCode(callSuper = false)
public class User {

  //...

  @JsonBackReference
  @ToString.Exclude
  @ManyToMany(fetch = FetchType.EAGER)
  @JoinTable(
      name = "users_roles",
      joinColumns = @JoinColumn(name = "user_id"),
      inverseJoinColumns = @JoinColumn(name = "role_id"))
  private Set<Role> roles;

}

@Entity
@Data
@EqualsAndHashCode(callSuper = false)
@Table(name = "roles")
public class Role implements GrantedAuthority {

  @Id
  @GeneratedValue(strategy = GenerationType.SEQUENCE)
  private Long roleId;

  @JsonBackReference
  @ToString.Exclude
  @ManyToMany(mappedBy = "roles")
  private Collection<User> users;

  @JsonBackReference
  @ToString.Exclude
  @ManyToMany
  @JoinTable(
      name = "roles_privileges",
      joinColumns = @JoinColumn(name = "role_id"),
      inverseJoinColumns = @JoinColumn(name = "privilege_id"))
  private Collection<Privilege> privileges;

  @Enumerated(EnumType.STRING)
  private UserRole name;

  public Role() {
    super();
  }

  public Role(UserRole name) {
    super();
    this.name = name;
  }

  @Override
  public String getAuthority() {
    return name.name();
  }
}

public enum UserRole {
  USER,
  ADMIN
}

@Entity
@Data
@EqualsAndHashCode(callSuper = false)
@Table(name = "privileges")
public class Privilege {

  

  @Enumerated(EnumType.STRING)
  private UserPrivilege name;

  @JsonBackReference
  @ToString.Exclude
  @ManyToMany(mappedBy = "privileges")
  private Collection<Role> roles;


}

public enum UserPrivilege {
  ADMIN_PRIVILEGE,
  READ_PRIVILEGE,
  WRITING_COMMENTS_PRIVILEGE
}