StackOverflow2013

Note that there are some explanatory texts on larger screens.

plurals

PO
primarykey
Id
19148656
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2013-10-02T23:51:01.187
FavoriteCount
0
LastActivityDate
2013-10-03T00:10:01.773
LastEditDate
2013-10-03T00:10:01.773
LastEditorUserId
27649
OwnerUserId
27649
ParentId
19148453
PostTypeId
2
Score
0
ViewCount
0
LastEditorDisplayName
text
Body
<code>Map</code> implementations use the <code>hashCode()</code> method in an object to determine the key to look up in their internal data structures when you call <code>get</code>. In your specific example, let's assume that your <code>MyObject</code> class had an <code>id</code> property: <pre><code>public class MyObject { private int id; public MyObject(int id) { this.id = id; } public int getId() { return id; } } </code></pre> Assume you wanted the <code>id</code> property to be used when looking up keys in a map - irrespective of the instance of the object - you'd override the <code>hashCode</code> method in your class to do this: <pre><code>public class MyObject { private int id; public MyObject(int id) { this.id = id; } public int getId() { return id; } /** * Uses the Jakarta commons-lang HashCodeBuilder class to generate the hash code. * * @see http://commons.apache.org/proper/commons-lang/apidocs/org/apache/commons/lang3/builder * /HashCodeBuilder.html */ public int hashCode() { return new HashCodeBuilder(1, 5) .append(id) .toHashCode(); } public boolean equals(Object other) { if (other == null) return false; if (other == this) return true; return (other.id == this.id); } } </code></pre> The <a href="http://commons.apache.org/proper/commons-lang/apidocs/org/apache/commons/lang3/builder/HashCodeBuilder.html#HashCodeBuilder%28int,%20int%29" rel="nofollow">documentation</a> for HashCodeBuilder explains what the numbers 1 and 5, passed as arguments to the HashCodeBuilder, do - I picked them randomly: the documentation says that they must be unique, random, odd numbers.
Tags
Title
singulars
PostAcceptedAnswerId
1. This table or related slice is empty.
PostParentId
1. POHow do maps check keys?
 singulars
 PostTypePostTypeId
 PTQuestion
PostTypePostTypeId
1. PTAnswer
UserLastEditorUserId
1. USHari
UserOwnerUserId
1. USHari
plurals
PostLinksPostIdRelatedPostId
1. This table or related slice is empty.
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. This table or related slice is empty.
PostsParentIdCreationDate
1. This table or related slice is empty.
VotesPostIdCreationDate
1. This table or related slice is empty.
CommentsPostId
1. This table or related slice is empty.

Querying!

Guidance

A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.