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dragonskyhydra · Nov 3, 2019 · 1134797 · 1134797
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diff --git a/2019/11/03/hello-world/index.html b/2019/11/03/hello-world/index.html
@@ -266,7 +266,7 @@ <h3 id="Deploy-to-remote-sites"><a href="#Deploy-to-remote-sites" class="headerl
                 <ul class="pager">
 
                         <li class="previous">
-                            <a href="/2019/11/03/java-list/" data-toggle="tooltip" data-placement="top" title="java-list">&larr; Previous post</a>
+                            <a href="/2019/11/03/java-list/" data-toggle="tooltip" data-placement="top" title="java list">&larr; Previous post</a>
                         </li>
 
 

diff --git a/2019/11/03/java-list/index.html b/2019/11/03/java-list/index.html
@@ -14,7 +14,7 @@
     <script async defer src="https://buttons.github.io/buttons.js"></script>
     <title>
 
-          java-list - null
+          java list - null
 
     </title>
 
@@ -107,7 +107,7 @@
                               <a class="tag" href="/tags/#Java" title="Java">Java</a>
 
                         </div>
-                        <h1>java-list</h1>
+                        <h1>java list</h1>
                         <h2 class="subheading"></h2>
                         <span class="meta">
                             Posted by hydra on
@@ -247,7 +247,19 @@ <h2 class="subheading"></h2>
                 col-md-10 col-md-offset-1
                 post-container">
 
-                <p>java集合学习</p>
+                <p>#java集合学习，其一</p>
+<p>List是一种有序链表：List内部按照放入元素的先后顺序存放，并且每个元素都可以通过索引确定自己的位置。<br>List还提供了boolean contains(Object o)方法来判断List是否包含某个指定元素。此外，int indexOf(Object o)方法可以返回某个元素的索引，如果元素不存在，就返回-1。</p>
+<p>List内部并不是通过==判断两个元素是否相等，而是使用equals()方法判断两个元素是否相等。<br>因此，要正确使用List的contains()、indexOf()这些方法，放入的实例必须正确覆写equals()方法，否则，放进去的实例，查找不到。我们之所以能正常放入String、Integer这些对象，是因为Java标准库定义的这些类已经正确实现了equals()方法。</p>
+<p>简化引用类型的比较，我们使用Objects.equals()静态方法：<br>‘’’Java<br>public boolean equals(Object o) {<br>    if (o instanceof Person) {<br>        Person p = (Person) o;<br>        return Objects.equals(this.name, p.name) &amp;&amp; this.age == p.age;<br>    }<br>    return false;<br>}<br>‘’’</p>
+<p>因此，我们总结一下equals()方法的正确编写方法：</p>
+<ol>
+<li>先确定实例“相等”的逻辑，即哪些字段相等，就认为实例相等；</li>
+<li>用instanceof判断传入的待比较的Object是不是当前类型，如果是，继续比较，否则，返回false；</li>
+<li>对引用类型用Objects.equals()比较，对基本类型直接用==比较。</li>
+</ol>
+<p>使用Objects.equals()比较两个引用类型是否相等的目的是省去了判断null的麻烦。两个引用类型都是null时它们也是相等的。<br>如果不调用List的contains()、indexOf()这些方法，那么放入的元素就不需要实现equals()方法。</p>
+<p>###参考</p>
+<p><a href="https://www.liaoxuefeng.com/wiki/1252599548343744/1265118019954528" target="_blank" rel="noopener">廖雪峰Java教程</a></p>
 
 
 

diff --git a/archives/2019/11/index.html b/archives/2019/11/index.html
@@ -271,7 +271,7 @@ <h1>数据之道</h1>
                     <i class="fa fa-angle-double-right" aria-hidden="true"></i>
                     <a href="/2019/11/03/java-list/" style="color: #0085a1">
                         <span>
-                            java-list
+                            java list
                         </span>
                     </a>
                     <!-- <p class="post-meta">{{ post.date | date:"%Y-%m-%d" }}</p> -->
@@ -382,7 +382,7 @@ <h5>Recent posts</h3>
     <ul>
 
         <li>
-          <a href="/2019/11/03/java-list/">java-list</a>
+          <a href="/2019/11/03/java-list/">java list</a>
         </li>
 
         <li>

diff --git a/archives/2019/index.html b/archives/2019/index.html
@@ -271,7 +271,7 @@ <h1>数据之道</h1>
                     <i class="fa fa-angle-double-right" aria-hidden="true"></i>
                     <a href="/2019/11/03/java-list/" style="color: #0085a1">
                         <span>
-                            java-list
+                            java list
                         </span>
                     </a>
                     <!-- <p class="post-meta">{{ post.date | date:"%Y-%m-%d" }}</p> -->
@@ -382,7 +382,7 @@ <h5>Recent posts</h3>
     <ul>
 
         <li>
-          <a href="/2019/11/03/java-list/">java-list</a>
+          <a href="/2019/11/03/java-list/">java list</a>
         </li>
 
         <li>

diff --git a/archives/index.html b/archives/index.html
@@ -271,7 +271,7 @@ <h1>数据之道</h1>
                     <i class="fa fa-angle-double-right" aria-hidden="true"></i>
                     <a href="/2019/11/03/java-list/" style="color: #0085a1">
                         <span>
-                            java-list
+                            java list
                         </span>
                     </a>
                     <!-- <p class="post-meta">{{ post.date | date:"%Y-%m-%d" }}</p> -->
@@ -382,7 +382,7 @@ <h5>Recent posts</h3>
     <ul>
 
         <li>
-          <a href="/2019/11/03/java-list/">java-list</a>
+          <a href="/2019/11/03/java-list/">java list</a>
         </li>
 
         <li>

diff --git a/index.html b/index.html
@@ -252,7 +252,7 @@ <h1>数据之道</h1>
 <div class="w3-row-padding">
 	<a href="/2019/11/03/java-list/">
         <h2 class="post-title">
-            java-list
+            java list
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@@ -264,8 +264,9 @@ <h3 class="post-subtitle">
     <a href="/2019/11/03/java-list/">
 
         <div class="post-content-preview">
-            java集合学习
-...
+            #java集合学习，其一
+List是一种有序链表：List内部按照放入元素的先后顺序存放，并且每个元素都可以通过索引确定自己的位置。List还提供了boolean contains(Object o)方法来判断List是否包含某个指定元素。此外，int indexOf(Object o)方法可以返回某个元素的索引，如果元素不存在，就返回-1。
+List内部并不是通过==判断两个元素是否.........
         </div>
     </a>
 
@@ -401,7 +402,7 @@ <h5>Recent posts</h3>
     <ul>
 
         <li>
-          <a href="/2019/11/03/java-list/">java-list</a>
+          <a href="/2019/11/03/java-list/">java list</a>
         </li>
 
         <li>

diff --git a/tag/Java/index.html → tags/Java/index.html b/tag/Java/index.html → tags/Java/index.html
@@ -18,7 +18,7 @@
 
     </title>
 
-    <link rel="canonical" href="https://dragonskyhydra.github.io/tag/Java/">
+    <link rel="canonical" href="https://dragonskyhydra.github.io/tags/Java/">
 
     <!-- Bootstrap Core CSS -->
 
@@ -271,7 +271,7 @@ <h1>数据之道</h1>
                     <i class="fa fa-angle-double-right" aria-hidden="true"></i>
                     <a href="/2019/11/03/java-list/" style="color: #0085a1">
                         <span>
-                            java-list
+                            java list
                         </span>
                     </a>
                     <!-- <p class="post-meta">{{ post.date | date:"%Y-%m-%d" }}</p> -->
@@ -382,7 +382,7 @@ <h5>Recent posts</h3>
     <ul>
 
         <li>
-          <a href="/2019/11/03/java-list/">java-list</a>
+          <a href="/2019/11/03/java-list/">java list</a>
         </li>
 
         <li>
@@ -525,7 +525,7 @@ <h5>Friends</h5>
 <script>
     // only load tagcloud.js in tag.html
     if($('#tag_cloud').length !== 0){
-        async("https://dragonskyhydra.github.io/tag/Java/index.html/js/jquery.tagcloud.js",function(){
+        async("https://dragonskyhydra.github.io/tags/Java/index.html/js/jquery.tagcloud.js",function(){
             $.fn.tagcloud.defaults = {
                 //size: {start: 1, end: 1, unit: 'em'},
                 color: {start: '#bbbbee', end: '#0085a1'},

diff --git a/tags/index.html b/tags/index.html
@@ -339,7 +339,7 @@ <h5>Recent posts</h3>
     <ul>
 
         <li>
-          <a href="/2019/11/03/java-list/">java-list</a>
+          <a href="/2019/11/03/java-list/">java list</a>
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@@ Expand Up / @@ -339,7 +339,7 @@ <h5>Recent posts</h3> @@
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-              <a href="/2019/11/03/java-list/">java-list</a>
+              <a href="/2019/11/03/java-list/">java list</a>
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