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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key. Because it contains a message
本节关于船舶所有人的规定，适用于光船承租人、船舶经营人和船舶管理人。