From af2015bec128ebf1318db3195b6da058bfba647e Mon Sep 17 00:00:00 2001
From: Martin Goik <goik@hdm-stuttgart.de>
Date: Wed, 17 Jan 2024 15:39:33 +0100
Subject: [PATCH] Unite code and related hash values
---
Doc/Sd1/CoreClasses/coreClasses.xml | 76 +++++++++++++++++++++++++----
1 file changed, 67 insertions(+), 9 deletions(-)
diff --git a/Doc/Sd1/CoreClasses/coreClasses.xml b/Doc/Sd1/CoreClasses/coreClasses.xml
index de66a8e2e..a95f569b0 100644
--- a/Doc/Sd1/CoreClasses/coreClasses.xml
+++ b/Doc/Sd1/CoreClasses/coreClasses.xml
@@ -376,6 +376,14 @@ public boolean equals(Object anObject) {
<informaltable border="1">
<tr>
+ <td rowspan="6"><programlisting language="none">public class Rectangle {
+ int width, height;
+...
+ @Override public int hashCode() {
+ return <emphasis role="red">width + height</emphasis>;
+ }
+}</programlisting></td>
+
<th>width</th>
<th>height</th>
@@ -384,19 +392,19 @@ public boolean equals(Object anObject) {
</tr>
<tr>
- <td valign="top">1</td>
+ <td valign="top"><emphasis role="red">1</emphasis></td>
- <td valign="top">3</td>
+ <td valign="top"><emphasis role="red">3</emphasis></td>
- <td valign="top">4</td>
+ <td valign="top"><emphasis role="red">4</emphasis></td>
</tr>
<tr>
- <td valign="top">2</td>
+ <td valign="top"><emphasis role="red">2</emphasis></td>
- <td valign="top">2</td>
+ <td valign="top"><emphasis role="red">2</emphasis></td>
- <td valign="top">4</td>
+ <td valign="top"><emphasis role="red">4</emphasis></td>
</tr>
<tr>
@@ -429,13 +437,63 @@ public boolean equals(Object anObject) {
<title><classname>Better </classname><methodname>hashCode()</methodname>
method</title>
- <programlisting language="java">public class Rectangle {
+ <informaltable border="1">
+ <tr>
+ <td rowspan="6"><programlisting language="none">public class Rectangle {
int width, height;
...
@Override public int hashCode() {
- return width + <emphasis role="red">13 * height</emphasis>;
+ return <emphasis role="red">width + 13 * height</emphasis>;
}
-}</programlisting>
+}</programlisting></td>
+
+ <th>width</th>
+
+ <th>height</th>
+
+ <th>hash value</th>
+ </tr>
+
+ <tr>
+ <td valign="top">1</td>
+
+ <td valign="top">3</td>
+
+ <td valign="top">40</td>
+ </tr>
+
+ <tr>
+ <td valign="top">2</td>
+
+ <td valign="top">2</td>
+
+ <td valign="top">28</td>
+ </tr>
+
+ <tr>
+ <td valign="top">5</td>
+
+ <td valign="top">5</td>
+
+ <td valign="top">70</td>
+ </tr>
+
+ <tr>
+ <td valign="top">2</td>
+
+ <td valign="top">7</td>
+
+ <td valign="top">93</td>
+ </tr>
+
+ <tr>
+ <td valign="top">4</td>
+
+ <td valign="top">9</td>
+
+ <td valign="top">121</td>
+ </tr>
+ </informaltable>
</figure>
<qandaset defaultlabel="qanda" xml:id="qanda_sw1TimeperiodHashing">
--
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