Two important methods about the object class and why overriding equals must rewrite Hashcode ()

ToString ()----------------------The value of the output object after the address of the output object is rewritten
object. Equals (object)---------------Compare the memory address overrides of two objects by comparing the properties of two objects (always overriding the Hashcode () method, because instance ab behaves equal by Equals, But they exist in the HashMap hashcode is still not the same)

The other more important methods of the object class are:

GetClass (): Gets the Class object (which emphasizes the code information of the class, the object of the class emphasizes the value of the class Code information) hashcode (): Unique object-sensitive (object address string) clone () Thread: Notify (), Notifyall (), Wait ()

Two important methods about the object class and why overriding equals must rewrite Hashcode ()