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#1 Created at ... [Delete] [Delete and Lock User]

class City {
    String name;
    double latitude;
    double longitude;
}

#2 Created at ... [Delete] [Delete and Lock User]

这里属性必须定义成public类型的，否则对象在外面访问不到

class City {
    public String name;
    public double latitude;
    public double longitude;
}