理解并掌握当一个类的对象作为另一个类的数据成员时，利用初始化表调用构造函数的方法、构造函数的执行顺序。
Understand and grasp the object as a class to another class as data members, using initialization table call the constructor method, constructor execution order.
注意一下目前我们的代码有哪些东西：首先，我们的Account类不是一个bean （实际上，对于它的一个数据成员它有一个getter方法――但是没有setter 方法）。
Notice what our code has so far: first, our Account class isn't a bean (it essentially has a getter -- but no setter -- for its one data member).
抽象基类有一个成员TreeItem，它是GWT中TreeIte m部件的实例，包含客户机数据，在使用回调类时回调与这些数据相关联。
The abstract base class has a member TreeItem that will be an instance of the TreeItem widget in GWT and will be the client data with which the callback is associated when the callback class is used.
构造函数的初始化列表为类的一个或多个数据成员指定初值。
A constructor initializer list specifies initial values for one or more data members of the class.
影响一个对象(如类的数据成员)布局的数据类型的更改。
Changes to a data type that affect the layout of an object, such as data members of a class.
影响一个对象(如类的数据成员)布局的数据类型的更改。
Changes to a data type that affect the layout of an object, such as data members of a class.
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