hasCode « equal method « Java Class Q&A

1.	abstract class
2.	Base class
3.	class hierarchy
4.	class name
5.	class version
6.	Class.forName
7.	ClassCastException
8.	Clone
9.	constant
10.	Constructor
11.	Development
12.	DTO
13.	encapsulation
14.	equal method
15.	extend Class
16.	getter
17.	hashcode
18.	Inheritance
19.	inner class
20.	interface
21.	main class
22.	Method
23.	NoClassDefFoundError
24.	NoSuchMethodError
25.	NoSuchMethodException
26.	object reference
27.	overload
28.	parent class
29.	Polymorphism
30.	private
31.	Private Field
32.	Recursive
33.	setter
34.	Static
35.	Static Class
36.	subclass
37.	Super
38.	toString
39.	Wrapper Class

Java Class Q&A » equal method » hasCode

1. How to write hasCode() & equals(0) methods in Compound Key Class coderanch.com

Hi All, I am wondering how to write the hashCode() and equals() methods that is mandatory when creating composite @IdClass. Below is the combination of primary @Id keys that I would like to make up in a compound key class: public final class PatientKey implements java.io.Serializable { private String firstnameId; private String SurnameId; private String DateOfBirthID; private String Sex; public int ...

2. Why do we need to override Hascode and Equals method? forums.oracle.com

Hi, == checks if the two references are equal and .equlas will check if the value is same, if we want .equals to take care of both reference and value are correct. why cant I just override equals with an extra check that references are equal(==). Please someone elaborate on this and also tell me what role hashcode plays in this. ...

3. Scenario in which implement or Write our own hascode and equals method forums.oracle.com

java2s.com | Contact Us | Privacy Policy

All other trademarks are property of their respective owners.