从对象中获取类名

class Person {
  constructor(name) {
    this.name = name;
  }
}

const person = new Person("Alice");
console.log(person.constructor.name); // 输出 "Person"

public class Person {
  private String name;

  public Person(String name) {
    this.name = name;
  }

  public String getName() {
    return name;
  }
}

Person person = new Person("Alice");
String className = person.getClass().getName();
System.out.println(className); // 输出 "Person"