StackOverflow2013

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plurals

PO
primarykey
Id
17920930
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2013-07-29T09:53:38.630
FavoriteCount
0
LastActivityDate
2013-07-29T10:18:54.090
LastEditDate
2013-07-29T10:18:54.090
LastEditorUserId
1727645
OwnerUserId
1727645
ParentId
17920906
PostTypeId
2
Score
2
ViewCount
0
LastEditorDisplayName
text
Body
For that you need to override <code>equals()</code> method for class <code>A</code> If you do not override the method it will use the <code>Object</code> class equals method which checks whether the reference varaibles refer to the same object or not. With <code>Integer</code> class, the <code>equals()</code> method is already overridden and which checks for the value. Also, whenever you are overriding <code>equals()</code>, override <code>hashcode()</code> also <pre><code>public class A { private int number; A(int number){ this.number = number; } public int getNumber() { return number; } public void setNumber(int number) { this.number = number; } @Override public int hashCode() { final int prime = 31; int result = 1; result = prime * result + number; return result; } @Override public boolean equals(Object obj) { if (this == obj) return true; if (obj == null) return false; if (getClass() != obj.getClass()) return false; A other = (A) obj; if (number != other.number) return false; return true; } public static void main(String[] args) { A a1 = new A(5); A a2 = new A(5); System.out.println(a1.equals(a2)); } } </code></pre> This prints out <code>true</code>. <blockquote> Why? Can anyone explain? </blockquote> With <code>Integer</code> class, the <code>equals()</code> method is already overridden and which checks for the value. <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Integer.html#equals%28java.lang.Object%29" rel="nofollow">Integer#equals()</a> A good tutorial helping understand the significance of equals method is provided on <a href="http://www.thejavageek.com/2013/06/26/what-is-the-significance-of-equals-method-in-java/" rel="nofollow">theJavaGeek</a>
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Title
singulars
PostAcceptedAnswerId
1. This table or related slice is empty.
PostParentId
1. POObject's equals method
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 PostTypePostTypeId
 PTQuestion
PostTypePostTypeId
1. PTAnswer
UserLastEditorUserId
1. USPrasad Kharkar
UserOwnerUserId
1. USPrasad Kharkar
plurals
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1. This table or related slice is empty.
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. POObject's equals method
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 PTQuestion
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1. This table or related slice is empty.
VotesPostIdCreationDate
1. VO
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 PostPostId
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 VTUpMod
2. VO
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1. This table or related slice is empty.

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