如何从数组中访问子对象？

var arr = [{name: "John"}, {name: "Jane"}, {name: "Bob"}];
console.log(arr[0].name); // 输出 "John"

arr = [{"name": "John"}, {"name": "Jane"}, {"name": "Bob"}]
print(arr[0]["name"]) # 输出 "John"

import java.util.ArrayList;
import java.util.HashMap;

public class Main {
    public static void main(String[] args) {
        ArrayList<HashMap<String, String>> arr = new ArrayList<>();
        HashMap<String, String> obj1 = new HashMap<>();
        obj1.put("name", "John");
        arr.add(obj1);
        HashMap<String, String> obj2 = new HashMap<>();
        obj2.put("name", "Jane");
        arr.add(obj2);
        HashMap<String, String> obj3 = new HashMap<>();
        obj3.put("name", "Bob");
        arr.add(obj3);

        System.out.println(arr.get(0).get("name")); // 输出 "John"
    }
}