You could imagine defining a separate, parallel IOComparator interface that does throw the necessary exceptions, as shown in Listing 5.
可以想象定义一个单独的、并行的IOComparator接口，该接口抛出必要的异常，如清单5所示。
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It looks like a kids' playground, with parallel bars, hanging rings, balls to throw, monkey bars, and various other structures that will be used in his physical patterning.