TradeRequest类记录用户在填写一个创建交易的表单时的输入信息，并且还提供一个验证方法。
The class TradeRequest collects the information entered by the user when filling in a create trade from and also contains a validation method.
虽然现在圣伯纳德犬已经不再用作救援犬了，它们仍旧保持着世界最重犬类的记录——其中作为表演狗的圣本铎犬，重达343磅。
Although Saint Bernards are no longer used for rescue work, they do still hold the world record for heaviest dog-a certain show dog, Benedictine, weighed in at 343 pounds!
JVM 在装载类时记录这个签名信息，并在运行时通过反射使它可用。
The JVM records this signature information when loading a class and makes it available at run time using reflection.
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