java面向对象 Idea集成开发

public class Person {}
public static void main(String[] args) {
Person[] arr2 = new Person[4];
arr2[0] = new Student("jck",18,"男","20180143");
arr2[1] = new Student("tom",18,"男","20180143");
arr2[2] = new Teacher("李玲",35,"女",20184356);
arr2[3] = new Teacher("朱莉",35,"女",20184356);

    public void bubbleSort(Person[] arr2){} // 在这个位置报错了，创建一个方法给我宝格措

}

public class Person {}
你这个类是空的，定义是不是有问题。

请贴上完整的代码或者截图，这样看不出来哪里有问题