[feat] #5 카테고리 엔티티 클래스 구현

src/main/java/org/sopt/seminar/domain/post/domain/Category.java

@@ -0,0 +1,42 @@
+package org.sopt.seminar.domain.post.domain;
+
+import jakarta.persistence.*;
+import lombok.*;
+import org.sopt.seminar.global.common.BaseTimeEntity;
+
+import java.util.ArrayList;
+import java.util.List;
+
+@RequiredArgsConstructor(access = AccessLevel.PROTECTED)
+@AllArgsConstructor(access = AccessLevel.PRIVATE)
+@Builder(access = AccessLevel.PRIVATE)
+@Getter
+@Entity
+public class Category extends BaseTimeEntity {
+    @Id
+    @GeneratedValue
+    @Column(name = "category_id")
+    private Short id;
+    private String content;
+    @OneToMany
+    @Builder.Default
+    private List<Post> posts = new ArrayList<>();
+
+    public static Category createCategory(final String content) {
+        return Category.builder()
+                .content(content)
+                .build();
+    }
+
+    public void addPost(Post post) {
+        posts.add(post);
+    }
+
+    public void removePost(Post post) {
+        posts.remove(post);
+    }
+
+    public void updateContent(String content) {
+        this.content = content;
+    }
+}