What must be true about valid equals() and hashCode() methods?01.equals(o2) = o1.hashCode()02.hashCode()==O 01.hashCode() == 02.hashCode = o1.equals(o2)!01.equals(o2) = o1.hashCode() != 02.hashCode()01.hashCode() != o2.hashCode() = !o1.equals(o2)O hashCode must have a low collision rate for the hash table to work correctly If I have the following codeMap x = new TreeMap();which of the following statements are true?O If you override Cat.equals you must override Cat.hashCodeYou must override Cat.equalsO You must override Dog.equalsO Cat must be comparableO Dog must be comparable

Answer:- o1.equals(o2) => o1.hashcode() == o2.hashcode() !o1.equals(o2) =>…

What must be true about valid equals() and hashCode() methods? O 01.equals(02) = o1.hashCode() == o2.hashCode() O 01.hashCode() == 02.hashCode = o1.equals(o2) O !01.equals(o2) = 01.hashCode() != o2.hashCode() 01.hashCode() != 02.hashCode() = !o1.equals(02) hashCode must have a low collision rate for the hash table to work correctly

What must be true about valid equals() and hashCode() methods? O 01.equals(02) = o1.hashCode() == o2.hashCode() O 01.hashCode() == 02.hashCode = o1.equals(o2) O !01.equals(o2) = 01.hashCode() != o2.hashCode() 01.hashCode() != 02.hashCode() = !o1.equals(02) hashCode must have a low collision rate for the hash table to work correctly

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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