1145482155.github.io/atom.xml at main · 1145482155/1145482155.github.io · GitHub

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<?xml version="1.0" encoding="utf-8"?>
<feed xmlns="http://www.w3.org/2005/Atom">
  <title>FATE</title>


  <link href="http://example.com/atom.xml" rel="self"/>

  <link href="http://example.com/"/>
  <updated>2022-10-29T12:33:25.345Z</updated>
  <id>http://example.com/</id>

  <author>
    <name>Cersei-cfc</name>

  </author>

  <generator uri="https://hexo.io/">Hexo</generator>

  <entry>
    <title>JAVA学习之路</title>
    <link href="http://example.com/2022/10/29/java%E5%AD%A6%E4%B9%A0/"/>
    <id>http://example.com/2022/10/29/java%E5%AD%A6%E4%B9%A0/</id>
    <published>2022-10-29T09:16:23.808Z</published>
    <updated>2022-10-29T12:33:25.345Z</updated>

    <content type="html"><![CDATA[<h3 id="1-八大Wrapper类">1.八大Wrapper类</h3><h4 id="1-1包装类">1.1包装类</h4><table><thead><tr><th>基本数据类型</th><th>包装类</th></tr></thead><tbody><tr><td>boolean</td><td><strong>Boolean</strong></td></tr><tr><td>char</td><td><strong>Character</strong></td></tr><tr><td>byte</td><td>Byte  (下面的父类都为Nubmer)</td></tr><tr><td>short</td><td>Short</td></tr><tr><td>int</td><td>Integer</td></tr><tr><td>long</td><td>Long</td></tr><tr><td>float</td><td>Float</td></tr><tr><td>double</td><td>Double</td></tr></tbody></table><figure class="highlight java"><table><tr><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="keyword">class</span> <span class="title class_">Integer01</span> &#123;</span><br><span class="line">    <span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title function_">main</span><span class="params">(String[] args)</span> &#123;</span><br><span class="line">        <span class="type">int</span> <span class="variable">n1</span> <span class="operator">=</span> <span class="number">100</span>;</span><br><span class="line"></span><br><span class="line"><span class="comment">//        jdk5之前是手动</span></span><br><span class="line">        <span class="comment">//手动装箱 int-&gt;integer</span></span><br><span class="line">        <span class="type">Integer</span> <span class="variable">integer</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="title class_">Integer</span>(n1);</span><br><span class="line">        <span class="type">Integer</span> <span class="variable">integer1</span> <span class="operator">=</span> Integer.valueOf(n1);</span><br><span class="line"></span><br><span class="line">        <span class="comment">//手动拆箱 integer-&gt;int</span></span><br><span class="line">        <span class="type">int</span> <span class="variable">i</span> <span class="operator">=</span> integer.intValue();</span><br><span class="line"></span><br><span class="line"><span class="comment">//        jdk5以后，自动</span></span><br><span class="line">        <span class="type">int</span> <span class="variable">n2</span> <span class="operator">=</span> <span class="number">200</span>;</span><br><span class="line">        <span class="comment">//底层使用是Integer.ValueOf()方法</span></span><br><span class="line"><span class="comment">//        自动装箱</span></span><br><span class="line">        <span class="type">Integer</span> <span class="variable">integer2</span> <span class="operator">=</span> n2;</span><br><span class="line">        <span class="comment">//底层使用是intValue()方法</span></span><br><span class="line"><span class="comment">//        自动拆箱</span></span><br><span class="line">        <span class="type">int</span> <span class="variable">n3</span> <span class="operator">=</span> integer2;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure><h4 id="1-2包装类测试题">1.2包装类测试题</h4><figure class="highlight java"><table><tr><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="keyword">class</span> <span class="title class_">text</span> &#123;</span><br><span class="line">    <span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title function_">main</span><span class="params">(String[] args)</span> &#123;</span><br><span class="line">        <span class="type">Object</span> <span class="variable">object1</span> <span class="operator">=</span> <span class="literal">true</span>? <span class="keyword">new</span> <span class="title class_">Integer</span>(<span class="number">1</span>):<span class="keyword">new</span> <span class="title class_">Double</span>(<span class="number">2.0</span>);</span><br><span class="line">        System.out.println(object1);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line">此题的答案为<span class="number">1.0</span>     三元运算符应该看做一个整体，后面出现了Double，故object1的<span class="type">int</span>类型也应转换。</span><br></pre></td></tr></table></figure><figure class="highlight java"><table><tr><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="keyword">class</span> <span class="title class_">text</span> &#123;</span><br><span class="line">    <span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title function_">main</span><span class="params">(String[] args)</span> &#123;</span><br><span class="line">        Object object2;</span><br><span class="line">        <span class="keyword">if</span>(<span class="literal">true</span>)</span><br><span class="line">            object2 = <span class="keyword">new</span> <span class="title class_">Integer</span>(<span class="number">1</span>);</span><br><span class="line">        <span class="keyword">else</span></span><br><span class="line">            object2 = <span class="keyword">new</span> <span class="title class_">Double</span>(<span class="number">2.0</span>);</span><br><span class="line">        System.out.println(object2);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line">此题答案为<span class="number">1</span> </span><br></pre></td></tr></table></figure>]]></content>


    <summary type="html">&lt;h3 id=&quot;1-八大Wrapper类&quot;&gt;1.八大Wrapper类&lt;/h3&gt;
&lt;h4 id=&quot;1-1包装类&quot;&gt;1.1包装类&lt;/h4&gt;
&lt;table&gt;
&lt;thead&gt;
&lt;tr&gt;
&lt;th&gt;基本数据类型&lt;/th&gt;
&lt;th&gt;包装类&lt;/th&gt;
&lt;/tr&gt;
&lt;/thead&gt;
&lt;tbody&gt;</summary>


  </entry>

  <entry>
    <title>LeetCode算法每一天</title>
    <link href="http://example.com/2022/10/23/java%E5%8A%9B%E6%89%A3/"/>
    <id>http://example.com/2022/10/23/java%E5%8A%9B%E6%89%A3/</id>
    <published>2022-10-23T03:04:56.582Z</published>
    <updated>2022-10-28T14:51:09.855Z</updated>

    <content type="html"><![CDATA[<p>[TOC]</p><h3 id="1-两数相加">1.两数相加</h3><p>描述：给定一个整数数组 nums 和一个整数目标值 target，请你在该数组中找出 和为目标值 target 的那 两个 整数，并返回它们的数组下标。</p><figure class="highlight java"><table><tr><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="type">int</span>[] twoSum(<span class="type">int</span>[] nums, <span class="type">int</span> target)</span><br><span class="line">   &#123;</span><br><span class="line">       <span class="type">int</span> l=nums.length;</span><br><span class="line">       <span class="keyword">for</span>(<span class="type">int</span> <span class="variable">i</span> <span class="operator">=</span><span class="number">0</span>;i&lt;l;i++)</span><br><span class="line">       &#123;</span><br><span class="line">           <span class="keyword">for</span>(<span class="type">int</span> j=i+<span class="number">1</span>;j&lt;l;j++)</span><br><span class="line">           &#123;</span><br><span class="line">               <span class="keyword">if</span>(target==nums[i]+nums[j])</span><br><span class="line">               &#123;</span><br><span class="line">                   <span class="keyword">return</span> <span class="keyword">new</span> <span class="title class_">int</span>[]&#123;i,j&#125;;</span><br><span class="line">               &#125;</span><br><span class="line">           &#125;</span><br><span class="line">       &#125;</span><br><span class="line">       <span class="keyword">return</span> <span class="keyword">new</span> <span class="title class_">int</span>[<span class="number">0</span>];</span><br><span class="line">   &#125;</span><br></pre></td></tr></table></figure>]]></content>


    <summary type="html">&lt;p&gt;[TOC]&lt;/p&gt;
&lt;h3 id=&quot;1-两数相加&quot;&gt;1.两数相加&lt;/h3&gt;
&lt;p&gt;描述：给定一个整数数组 nums 和一个整数目标值 target，请你在该数组中找出 和为目标值 target 的那 两个 整数，并返回它们的数组下标。&lt;/p&gt;
&lt;figure class=&quot;</summary>


  </entry>

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