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项目初始化.md">13. 项目初始化.md</a></li></ul></li></ul></aside><main class="vp-page"><div class="theme-default-content"><div><h2 id="java-插件" tabindex="-1"><a class="header-anchor" href="#java-插件"><span>Java 插件</span></a></h2><div class="language-text line-numbers-mode" data-highlighter="prismjs" data-ext="text" data-title="text"><pre class="language-text"><code><span class="line">自动导入包，</span> <span class="line">大小写自动转换</span> <span class="line">插件ptg</span> <span class="line"></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h2 id="变量定义" tabindex="-1"><a class="header-anchor" href="#变量定义"><span>变量定义</span></a></h2><blockquote><p>在定义<code>长整型(long)</code>变量的时，需要末尾加个L(大小都可以)</p></blockquote><div class="language-text line-numbers-mode" data-highlighter="prismjs" data-ext="text" data-title="text"><pre class="language-text"><code><span class="line">long n = 999999999L</span> <span class="line"></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div></div></div><blockquote><p>在定义<code>浮点型(float)</code>变量的时，需要末尾加个F(大小都可以)</p></blockquote><div class="language-text line-numbers-mode" data-highlighter="prismjs" data-ext="text" data-title="text"><pre class="language-text"><code><span class="line">float f = 999999999F</span> <span class="line"></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div></div></div><h2 id="数组" tabindex="-1"><a class="header-anchor" href="#数组"><span>数组</span></a></h2><blockquote><p><strong>数组一旦被定义不能更改长度</strong></p></blockquote><div class="language-java line-numbers-mode" data-highlighter="prismjs" data-ext="java" data-title="java"><pre class="language-java"><code><span class="line"><span class="token keyword">int</span><span class="token punctuation">[</span><span class="token punctuation">]</span> array <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token keyword">int</span><span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">{</span><span class="token number">11</span><span class="token punctuation">,</span><span class="token number">22</span><span class="token punctuation">,</span><span class="token number">333</span><span class="token punctuation">}</span><span class="token punctuation">;</span> <span class="token comment">//完整形式</span></span> <span class="line"><span class="token keyword">int</span><span class="token punctuation">[</span><span class="token punctuation">]</span> array <span class="token operator">=</span> <span class="token punctuation">{</span><span class="token number">11</span><span class="token punctuation">,</span><span class="token number">22</span><span class="token punctuation">,</span><span class="token number">333</span><span class="token punctuation">}</span><span class="token punctuation">;</span> <span class="token comment">//简写形式</span></span> <span class="line"></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div></div></div><blockquote><h3 id="动态创建数组" tabindex="-1"><a class="header-anchor" href="#动态创建数组"><span>动态创建数组</span></a></h3></blockquote><blockquote><p>动态创建数组初始化长度，系统会默认给默认值null <code>String[] array =new String[15];</code></p></blockquote><div class="language-java line-numbers-mode" data-highlighter="prismjs" data-ext="java" data-title="java"><pre class="language-java"><code><span class="line"><span class="token keyword">public</span> <span class="token keyword">class</span> hello_world <span class="token punctuation">{</span></span> <span class="line"> <span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token punctuation">{</span></span> <span class="line"> <span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> array <span class="token operator">=</span><span class="token keyword">new</span> <span class="token class-name">String</span><span class="token punctuation">[</span><span class="token number">15</span><span class="token punctuation">]</span><span class="token punctuation">;</span></span> <span class="line"> <span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">int</span> i <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span> i <span class="token operator"><</span> array<span class="token punctuation">.</span>length<span class="token punctuation">;</span> i<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token punctuation">{</span></span> <span class="line"> <span class="token keyword">if</span><span class="token punctuation">(</span>i<span class="token operator"><</span><span class="token number">10</span><span class="token punctuation">)</span><span class="token punctuation">{</span></span> <span class="line"> array<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token operator">=</span> <span class="token class-name">Integer</span><span class="token punctuation">.</span><span class="token function">toString</span><span class="token punctuation">(</span>i<span class="token punctuation">)</span><span class="token punctuation">;</span></span> <span class="line"> <span class="token punctuation">}</span></span> <span class="line"> <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">print</span><span class="token punctuation">(</span>array<span class="token punctuation">[</span>i<span class="token punctuation">]</span> <span class="token operator">+</span> <span class="token string">" "</span><span class="token punctuation">)</span><span class="token punctuation">;</span></span> <span class="line"> <span class="token punctuation">}</span></span> <span class="line"> <span class="token punctuation">}</span></span> <span class="line"><span class="token punctuation">}</span></span> <span class="line"></span> <span class="line"><span class="token comment">// 打印结果: 0 1 2 3 4 5 6 7 8 9 null null null null null</span></span> <span class="line"></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h2 id="二维数组定义-遍历" tabindex="-1"><a class="header-anchor" href="#二维数组定义-遍历"><span>二维数组定义遍历</span></a></h2><div class="language-java line-numbers-mode" data-highlighter="prismjs" data-ext="java" data-title="java"><pre class="language-java"><code><span class="line"><span class="token keyword">public</span> <span class="token keyword">class</span> hello_world <span class="token punctuation">{</span></span> <span class="line"> <span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token punctuation">{</span></span> <span class="line"> <span class="token keyword">int</span><span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">[</span><span class="token punctuation">]</span> arr <span class="token operator">=</span> <span class="token punctuation">{</span></span> <span class="line"> <span class="token punctuation">{</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">}</span><span class="token punctuation">,</span></span> <span class="line"> <span class="token punctuation">{</span><span class="token number">3</span><span class="token punctuation">,</span> <span class="token number">4</span><span class="token punctuation">}</span></span> <span class="line"> <span class="token punctuation">}</span><span class="token punctuation">;</span></span> <span class="line"> <span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">int</span> i <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span> i <span class="token operator"><</span> arr<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">.</span>length<span class="token punctuation">;</span> i<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token punctuation">{</span></span> <span class="line"> <span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">int</span> j <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span> j <span class="token operator"><</span> arr<span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">]</span><span class="token punctuation">.</span>length<span class="token punctuation">;</span> j<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token punctuation">{</span></span> <span class="line"> <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">print</span><span class="token punctuation">(</span>arr<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">[</span>j<span class="token punctuation">]</span> <span class="token operator">+</span> <span class="token string">","</span><span class="token punctuation">)</span><span class="token punctuation">;</span></span> <span class="line"> <span class="token punctuation">}</span></span> <span class="line"> <span class="token punctuation">}</span></span> <span class="line"> <span class="token punctuation">}</span></span> <span class="line"><span class="token punctuation">}</span></span> <span class="line"></span> <span class="line"></span> <span class="line"><span class="token comment">// 打印结果 1,2,3,4,</span></span> <span class="line"></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><blockquote><h3 id="动态创建二维数组" tabindex="-1"><a class="header-anchor" href="#动态创建二维数组"><span>动态创建二维数组</span></a></h3></blockquote><div class="language-java line-numbers-mode" data-highlighter="prismjs" data-ext="java" data-title="java"><pre class="language-java"><code><span class="line"><span class="token keyword">public</span> <span class="token keyword">class</span> hello_world <span class="token punctuation">{</span></span> <span class="line"> <span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token punctuation">{</span></span> <span class="line"> <span class="token keyword">int</span><span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">[</span><span class="token punctuation">]</span> arr <span class="token operator">=</span><span class="token keyword">new</span> <span class="token keyword">int</span><span class="token punctuation">[</span><span class="token number">5</span><span class="token punctuation">]</span><span class="token punctuation">[</span><span class="token number">4</span><span class="token punctuation">]</span><span class="token punctuation">;</span></span> <span class="line"> <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>arr<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">.</span>length<span class="token operator">+</span>arr<span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">]</span><span class="token punctuation">.</span>length<span class="token punctuation">)</span><span class="token punctuation">;</span></span> <span class="line"> <span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">int</span> i <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span> i <span class="token operator"><</span> arr<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">.</span>length<span class="token punctuation">;</span> i<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token punctuation">{</span></span> <span class="line"> <span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">int</span> j <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span> j <span class="token operator"><</span> arr<span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">]</span><span class="token punctuation">.</span>length<span class="token punctuation">;</span> j<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token punctuation">{</span></span> <span class="line"> arr<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">[</span>j<span class="token punctuation">]</span><span class="token operator">=</span>i<span class="token operator">+</span>j<span class="token punctuation">;</span></span> <span class="line"> <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">print</span><span class="token punctuation">(</span>arr<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">[</span>j<span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</span></span> <span class="line"> <span class="token punctuation">}</span></span> <span class="line"> <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">""</span><span class="token punctuation">)</span><span class="token punctuation">;</span></span> <span class="line"> <span class="token punctuation">}</span></span> <span class="line"> <span class="token punctuation">}</span></span> <span class="line"><span class="token punctuation">}</span></span> <span class="line"><span class="token comment">//输出结果：</span></span> <span class="line"><span class="token comment">//8</span></span> <span class="line"><span class="token comment">//0123</span></span> <span class="line"><span class="token comment">//1234</span></span> <span class="line"><span class="token comment">//2345</span></span> <span class="line"><span class="token comment">//3456</span></span> <span class="line"></span> <span class="line"></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><blockquote><h3 id="二维数组求【自写案例】" tabindex="-1"><a class="header-anchor" href="#二维数组求【自写案例】"><span>二维数组求【自写案例】</span></a></h3></blockquote><div class="language-java line-numbers-mode" data-highlighter="prismjs" data-ext="java" data-title="java"><pre class="language-java"><code><span class="line"><span class="token keyword">public</span> <span class="token keyword">class</span> hello_world <span class="token punctuation">{</span></span> <span class="line"> <span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token punctuation">{</span></span> <span class="line"> <span class="token keyword">int</span><span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">[</span><span class="token punctuation">]</span> arr <span class="token operator">=</span> <span class="token punctuation">{</span></span> <span class="line"> <span class="token punctuation">{</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">}</span><span class="token punctuation">,</span></span> <span class="line"> <span class="token punctuation">{</span><span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">,</span> <span class="token number">4</span><span class="token punctuation">,</span> <span class="token number">5</span><span class="token punctuation">}</span><span class="token punctuation">,</span></span> <span class="line"> <span class="token punctuation">{</span><span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">,</span> <span class="token number">4</span><span class="token punctuation">,</span> <span class="token number">5</span><span class="token punctuation">,</span> <span class="token number">5</span><span class="token punctuation">}</span><span class="token punctuation">,</span></span> <span class="line"> <span class="token punctuation">{</span><span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">,</span> <span class="token number">4</span><span class="token punctuation">,</span> <span class="token number">5</span><span class="token punctuation">,</span> <span class="token number">4</span><span class="token punctuation">,</span> <span class="token number">5</span><span class="token punctuation">}</span><span class="token punctuation">,</span></span> <span class="line"> <span class="token punctuation">}</span><span class="token punctuation">;</span></span> <span class="line"> <span class="token keyword">int</span> count <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span></span> <span class="line"> <span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">int</span> i <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span> i <span class="token operator"><</span> arr<span class="token punctuation">.</span>length<span class="token punctuation">;</span> i<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token punctuation">{</span></span> <span class="line"> <span class="token keyword">int</span> sum <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span></span> <span class="line"> <span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">int</span> j <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span> j <span class="token operator"><</span> arr<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">.</span>length<span class="token punctuation">;</span> j<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token punctuation">{</span></span> <span class="line"> sum <span class="token operator">+=</span> arr<span class="token punctuation">[</span>i<span class="token punctuation">]</span><span class="token punctuation">[</span>j<span class="token punctuation">]</span><span class="token punctuation">;</span></span> <span class="line"> <span class="token punctuation">}</span></span> <span class="line"> count <span class="token operator">+=</span> sum<span class="token punctuation">;</span></span> <span class="line"> <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">print</span><span class="token punctuation">(</span>sum <span class="token operator">+</span> <span class="token string">" "</span><span class="token punctuation">)</span><span class="token punctuation">;</span></span> <span class="line"> <span class="token punctuation">}</span></span> <span class="line"> <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"累计为:"</span> <span class="token operator">+</span> count<span class="token punctuation">)</span><span class="token punctuation">;</span></span> <span class="line"> <span class="token punctuation">}</span></span> <span class="line"><span class="token punctuation">}</span></span> <span class="line"><span class="token comment">// 输出结果：</span></span> <span class="line"><span class="token comment">// 6 14 19 23 累计为:62</span></span> <span class="line"></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h2 id="方法重载" tabindex="-1"><a class="header-anchor" href="#方法重载"><span>方法重载</span></a></h2><blockquote><p>同一个方法名可以定义多个,但要注意一定要<code>区分参数个数</code>或者<code>返回值类型</code>,如果相同则不构成重载关系.</p></blockquote><div class="language-java line-numbers-mode" data-highlighter="prismjs" data-ext="java" data-title="java"><pre class="language-java"><code><span class="line"><span class="token keyword">public</span> <span class="token keyword">class</span> hello_world <span class="token punctuation">{</span></span> <span class="line"> <span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token punctuation">{</span></span> <span class="line"> <span class="token function">sum</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">)</span><span class="token punctuation">;</span></span> <span class="line"> <span class="token function">sum</span><span class="token punctuation">(</span><span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">3</span><span class="token punctuation">,</span> <span class="token number">5</span><span class="token punctuation">)</span><span class="token punctuation">;</span></span> <span class="line"> <span class="token punctuation">}</span></span> <span class="line"></span> <span class="line"> <span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">int</span> <span class="token function">sum</span><span class="token punctuation">(</span><span class="token keyword">int</span> a<span class="token punctuation">,</span> <span class="token keyword">int</span> b<span class="token punctuation">)</span> <span class="token punctuation">{</span></span> <span class="line"> <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">;</span></span> <span class="line"> <span class="token keyword">return</span> <span class="token punctuation">(</span>a <span class="token operator">+</span> b<span class="token punctuation">)</span><span class="token punctuation">;</span></span