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import java.io.IOException;
import java.io.InputStreamReader;
import java.io.LineNumberReader;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
 
import com.google.gson.Gson;
import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;
import com.google.gson.*;
public class JSONUtils {
    public JSONUtils() {
    }
 
 
    public Post[] getBoardOpPosts(String boardCode) {
        String input = getJSON("https://2...content-available-to-author-only...h.hk/" + boardCode + "/threads.json");
        ArrayList<Post> posts = new ArrayList<>();
        JsonParser parser = new com.google.gson.JsonParser();
        JsonObject mainObject = parser.parse(input).getAsJsonObject();
        JsonArray pItem = mainObject.getAsJsonArray("threads");
        for (JsonElement n : pItem) {
            JsonObject userObject = n.getAsJsonObject();
            posts.add(new Post(userObject.get("num").getAsInt(), userObject.get("comment").toString()));
        }
        Post ret[] = new Post[posts.size()];
        for (int i = 0; i < posts.size(); i++) {
            ret[i] = posts.get(i);
        }
        return ret;
    }
 
    public Post[] getThreadPosts(String boardCode, int num) {
        String input = getJSON("https://2...content-available-to-author-only...h.hk/" + boardCode + "/res/" + num + ".json");
        System.out.println("https://2...content-available-to-author-only...h.hk/" + boardCode + "/res/" + num + ".json");
        ArrayList<Post> posts = new ArrayList<>();
        JsonParser parser = new JsonParser();
        JsonObject mainObject = parser.parse(input).getAsJsonObject();
        JsonArray pItem = mainObject.getAsJsonArray("posts");
        for (JsonElement n : pItem) {
            JsonObject userObject = n.getAsJsonObject();
            posts.add(new Post(userObject.get("num").getAsInt(), userObject.get("comment").toString()));
        }
        Post ret[] = new Post[posts.size()];
        for (int i = 0; i < posts.size(); i++) {
            ret[i] = posts.get(i);
        }
        return ret;
    }
 
    private String getJSON(String address) {
        String string;
        StringBuilder stringBuilder = new StringBuilder();
        try {
            URL url = new URL(address);
            try {
                LineNumberReader reader = new LineNumberReader(new InputStreamReader(url.openStream()));
                string = reader.readLine();
                while (string != null) {
                    stringBuilder.append(string);
                    string = reader.readLine();
                }
                reader.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
 
        } catch (MalformedURLException ex) {
            ex.printStackTrace();
        }
        return stringBuilder.toString();
    }
}
 

Main.java:14: error: class JSONUtils is public, should be declared in a file named JSONUtils.java
public class JSONUtils {
       ^
Main.java:8: error: package com.google.gson does not exist
import com.google.gson.Gson;
                      ^
Main.java:9: error: package com.google.gson does not exist
import com.google.gson.JsonArray;
                      ^
Main.java:10: error: package com.google.gson does not exist
import com.google.gson.JsonElement;
                      ^
Main.java:11: error: package com.google.gson does not exist
import com.google.gson.JsonObject;
                      ^
Main.java:12: error: package com.google.gson does not exist
import com.google.gson.JsonParser;
                      ^
Main.java:13: error: package com.google.gson does not exist
import com.google.gson.*;
^
Main.java:19: error: cannot find symbol
    public Post[] getBoardOpPosts(String boardCode) {
           ^
  symbol:   class Post
  location: class JSONUtils
Main.java:36: error: cannot find symbol
    public Post[] getThreadPosts(String boardCode, int num) {
           ^
  symbol:   class Post
  location: class JSONUtils
Main.java:21: error: cannot find symbol
        ArrayList<Post> posts = new ArrayList<>();
                  ^
  symbol:   class Post
  location: class JSONUtils
Main.java:22: error: cannot find symbol
        JsonParser parser = new com.google.gson.JsonParser();
        ^
  symbol:   class JsonParser
  location: class JSONUtils
Main.java:22: error: package com.google.gson does not exist
        JsonParser parser = new com.google.gson.JsonParser();
                                               ^
Main.java:23: error: cannot find symbol
        JsonObject mainObject = parser.parse(input).getAsJsonObject();
        ^
  symbol:   class JsonObject
  location: class JSONUtils
Main.java:24: error: cannot find symbol
        JsonArray pItem = mainObject.getAsJsonArray("threads");
        ^
  symbol:   class JsonArray
  location: class JSONUtils
Main.java:25: error: cannot find symbol
        for (JsonElement n : pItem) {
             ^
  symbol:   class JsonElement
  location: class JSONUtils
Main.java:26: error: cannot find symbol
            JsonObject userObject = n.getAsJsonObject();
            ^
  symbol:   class JsonObject
  location: class JSONUtils
Main.java:27: error: cannot find symbol
            posts.add(new Post(userObject.get("num").getAsInt(), userObject.get("comment").toString()));
                          ^
  symbol:   class Post
  location: class JSONUtils
Main.java:29: error: cannot find symbol
        Post ret[] = new Post[posts.size()];
        ^
  symbol:   class Post
  location: class JSONUtils
Main.java:29: error: cannot find symbol
        Post ret[] = new Post[posts.size()];
                         ^
  symbol:   class Post
  location: class JSONUtils
Main.java:39: error: cannot find symbol
        ArrayList<Post> posts = new ArrayList<>();
                  ^
  symbol:   class Post
  location: class JSONUtils
Main.java:40: error: cannot find symbol
        JsonParser parser = new JsonParser();
        ^
  symbol:   class JsonParser
  location: class JSONUtils
Main.java:40: error: cannot find symbol
        JsonParser parser = new JsonParser();
                                ^
  symbol:   class JsonParser
  location: class JSONUtils
Main.java:41: error: cannot find symbol
        JsonObject mainObject = parser.parse(input).getAsJsonObject();
        ^
  symbol:   class JsonObject
  location: class JSONUtils
Main.java:42: error: cannot find symbol
        JsonArray pItem = mainObject.getAsJsonArray("posts");
        ^
  symbol:   class JsonArray
  location: class JSONUtils
Main.java:43: error: cannot find symbol
        for (JsonElement n : pItem) {
             ^
  symbol:   class JsonElement
  location: class JSONUtils
Main.java:44: error: cannot find symbol
            JsonObject userObject = n.getAsJsonObject();
            ^
  symbol:   class JsonObject
  location: class JSONUtils
Main.java:45: error: cannot find symbol
            posts.add(new Post(userObject.get("num").getAsInt(), userObject.get("comment").toString()));
                          ^
  symbol:   class Post
  location: class JSONUtils
Main.java:47: error: cannot find symbol
        Post ret[] = new Post[posts.size()];
        ^
  symbol:   class Post
  location: class JSONUtils
Main.java:47: error: cannot find symbol
        Post ret[] = new Post[posts.size()];
                         ^
  symbol:   class Post
  location: class JSONUtils
29 errors

Standard output is empty