从很大的对象数组列表中查找所需的数据

如何解决从很大的对象数组列表中查找所需的数据

一个数组列表包含190,000个结构对象

 {
   srno: 51,health_facility_name: "keeraipatti",address: "Keeraipatti building",street: "keeraipatti",landmark: "keeraipatti",locality: "keeraipatti",pincode: 636903,landline_number: "NA",latitude: 12.005075,longitude: 78.533949,altitude: 394.6894,facility_type: "SubCentre",state_name: "Tamil Nadu",district_name: "Dharmapuri",taluka_name: "Harur",block_name: "Harur"
} 

我使用HTML Gelocation API获取用户的当前位置，并通过JavaScript（window.location.href ='......'）将用户的经度和纬度发送到端点

@GetMapping("/nearHospitals/{lattitude}/{longitude}")
public String nearHospitalsHandler(@PathVariable("lattitude")double lattitude,@PathVariable("longitude") double longitude)
{
    //call service method to get List of 20 Hospital Objects closest to the user's 
    //location and put it inside the Modal for the view to render
    //what should be the logic here 
    return "nearHospitalsView";
}

现在，我有一种方法可以计算出医院（ArrayList中的Object）与用户当前位置之间的距离。

现在我应该如何进行下去，找到最近的20家医院并返回其清单的有效方法是什么。