5 years ago (2016-03-18)  Technology |   First to comment  15 
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For some basic data types, int, long, bool, and char!, "==" means that the value is equal, there is no equal method. The equal method is the method inside the object object. In Java, String is not a basic data type, but a class, they are all inherited from the object class, and the difference between Integer and int is Integer is a class! In the object class, the equal method is equivalent to "==", and "==" does not mean that the values ​​are equal, but the address of the comparison object is equal!Both Integer and String are rewritten (yes!Is to rewrite, overload is to write multiple functions with the same name but different parameters; rewrite is a re-definition of the parent class, reflecting the polymorphism), the equal method after the String, Integer rewrite, is a comparative value Instead of the address.


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