单词clearable
网络: 可以清除；晴朗的
You add each button both to the panel and to the instance list of clearable items, which you"ll use in one of the listeners.
您将各个按钮同时添加到面板中和可清除项的实例列表中，这个列表将用于一个侦听器之中。
This button simply walks through the clearable list and clears everything, as shown in Listing 9.
该按钮仅仅是遍历clearable列表并清除所有内容，如清单9所示。
Add a listener for the button, and then put the check boxes in the clearable list.
为按钮添加一个侦听器，随后将复选框放在clearable列表中。