如何设置"if object exists"条件？

import os

if os.path.exists("file_path"):
    print("File exists")
else:
    print("File does not exist")

import java.nio.file.Files;
import java.nio.file.Paths;

public class FileExistsExample {
    public static void main(String[] args) {
        if (Files.exists(Paths.get("file_path"))) {
            System.out.println("File exists");
        } else {
            System.out.println("File does not exist");
        }
    }
}

SELECT COUNT(*) FROM table_name WHERE column_name = 'value';

import requests

response = requests.get("url")

if response.status_code == 200:
    print("Resource exists")
else:
    print("Resource does not exist")

import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;

public class ResourceExistsExample {
    public static void main(String[] args) throws Exception {
        CloseableHttpClient httpClient = HttpClients.createDefault();
        HttpGet httpGet = new HttpGet("url");
        HttpResponse response = httpClient.execute(httpGet);

        if (response.getStatusLine().getStatusCode() == 200) {
            System.out.println("Resource exists");
        } else {
            System.out.println("Resource does not exist");
        }

        httpClient.close();
    }
}