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。
It returns the number of bytes that were not clearable or zero if the operation was successful.
它将返回不可清除的字节数，如果操作成功，则返回0。
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。
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。
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。
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