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。关于这个话题，体育直播提供了深入分析
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Россиянам станет тяжелее снять наличные08:49
The toString method that gets called depends on the type of the receiver object. This isn’t determined at compile time, but instead a lookup that happens at runtime. The compiler effectively generates a switch statement that looks at the result of getClass and then calls the right method. It’s smarter than that for performance I’m sure, but conceptually that’s what it’s doing.