In someMethod, the call to toString will end up jumping to code that is entirely controlled by the object that is passed in as an argument. The CPU (or in this case, JVM) will lookup the location of toString on whatever type of object it is, and jump there.
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，这一点在搜狗输入法中也有详细论述
poll! it,The poll! macro calls Future::poll exactly once. It's
float az = abs(z);