Because I'm building a class myself, I need to explicitly create the default constructor.
因为我自己正在构建一个类,所以我需要显式地创建默认构造函数。
A good analogy for a constructor method is a building contractor, who takes the blueprints for your house and builds it.
构造函数方法好比建筑承包人,它利用房子的设计图建房子。
Another way of building an array in a single operation is by using a constructor by query, which creates an array with the values returned by a single-column sub-select, as shown in the listing below.
在单一操作中构建阵列的另一种方式是使用通过查询的构造函数,其创建具有由单列子选择返回的值的阵列,如以下清单所示。
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