golang笔试题（实例）
发布时间：2022-02-09 编辑：jiaochengji.com
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<svg xmlns="http://www.w3.org/2000/svg" style="display: none;"><path stroke-linecap="round" d="M5,0 0,2.5 5,5z" id="raphael-marker-block" style="-webkit-tap-highlight-color: rgba(0, 0, 0, 0);"/></svg><h3>选择题（多选）</h3>
1.关于switch语句，下面说法正确的有（）
<pre><code>A、条件表达式必须为常量或者整数 B、单个case中，可以出现多个结果选项 C、需要用break来明确退出一个case D、只有在case中明确添加fallthough关键字，才会继续执行紧跟的下一个case </code></pre>答案：BD
2.通过指针变量p访问其成员变量name，下面说法正确的是（）
<pre><code>A、p.name B、(*p).name C、(&p).name D、p->name </code></pre>答案：AB
3.关于接口和类的说法，下面说法正确的是（）
<pre><code>A、一个类只需要实现了接口要求的所有函数，我们就说这个类实现了该接口 B、实现类的时候，只需要关心自己应该提供哪些方法，不用再纠结接口需要拆得多细才合理 C、类实现接口时需要导入接口所在的包 D、接口由使用方按自身需求来定义，使用方无需关心是否有其他模块定义过类似的接口 </code></pre>答案：ABD
4.关于协程，下面说法正确的是（）
<pre><code>A、协程和线程都可以实现程序的并发执行 B、线程比协程更轻量级 C、协程不存在死锁的问题 D、通过channel来进行协程间的通信 </code></pre>答案：AD
5.关于同步锁，下面说法正确的是（）
<pre><code>A、当一个goroutine获得了Mutex后，其他goroutine就只能乖乖等待，除非该goroutine释放这个锁Mutex B、RWMutex在读锁占用的情况下，会阻止写，但不阻止读 C、RWMutex在写锁占用情况下，会阻止任何其他goroutine（无论读和写）进来，相当于由该goroutine独占 D、Lock()操作需要保证有Unlock()和RUnlock()调用与之对应 </code></pre>答案：ABC
6.关于select机制，下面说法正确的是（）
<pre><code>A、select机制用来处理异步IO问题 B、select机制最大的一条限制就是每个case语句里必须是一个IO操作 C、golang在语言级别支持select关键字 D、select关键字的用法与switch语句非常类似，后面要带判断条件 </code></pre>答案：ABC
7.下面的程序的运行结果是（）
<pre><code class="lang-go hljs"><span class="token keyword">func</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token boolean">true</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token keyword">defer</span> fmt<span class="token punctuation">.</span><span class="token function">Printf</span><span class="token punctuation">(</span><span class="token string">"1"</span><span class="token punctuation">)</span> <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span> <span class="token keyword">defer</span> fmt<span class="token punctuation">.</span><span class="token function">Printf</span><span class="token punctuation">(</span><span class="token string">"2"</span><span class="token punctuation">)</span> <span class="token punctuation">}</span> fmt<span class="token punctuation">.</span><span class="token function">Printf</span><span class="token punctuation">(</span><span class="token string">"3"</span><span class="token punctuation">)</span> <span class="token punctuation">}</span> </code></pre> <pre><code>A、321 B、32 C、31 D、13 </code></pre>答案：c
8.下面赋值正确的是（）
<pre><code>A、var x = nil B、var x interface{} = nil C、var x string = nil D、var x error = nil </code></pre>答案：BD
9.关于go vendor，下面说法正确的是（）
<pre><code>A、基本思想是将引用的外部包的源代码放在当前工程的vendor目录下面 B、编译go代码会优先从vendor目录先寻找依赖包 C、可以指定引用某个特定版本的外部包 D、有了vendor目录后，打包当前的工程代码到其他机器的￥GOPATH/src下都可以通过编译 </code></pre>答案：ABD
10.关于异常设计，下面说法正确的是（）
<pre><code>A、在程序开发阶段，坚持速错，让程序异常崩溃 B、在程序部署后，应恢复异常避免程序终止 C、一切皆错误，不用进行一场设计 D、对于不应该出现的分支，使用异常处理 </code></pre>答案：ABD
11.关于channel的特性，下面说法正确的是（）
<pre><code>A、给一个nil channel发送数据，造成永远阻塞 B、给一个nil channel接收数据，造成永久阻塞 C、给一个已经关闭的channel发送数据，引起panic D、从一个已经关闭的channel接收数据，如果缓冲区中为空，则返回一个零值 </code></pre>答案：ABCD
12.关于map，下面说法正确的是（）
<pre><code>A、map反序列化时json.unmarshal的入参必须为map的地址 B、在函数调用中传递map，则子函数中对map元素的增加不会导致父函数中map的修改 C、在函数调用中传递map，则子函数中对map元素的修改不会导致父函数中map的修改 D、不能使用内置函数delete删除map的元素 </code></pre>答案：A
13.从切片中删除一个元素，下面的算法实现正确的是（）
<pre><code>A、 </code></pre> <pre><code class="lang-go hljs"><span class="token keyword">func</span> （s <span class="token operator">*</span>Slice） <span class="token function">Remove</span><span class="token punctuation">(</span>value <span class="token keyword">interface</span><span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token keyword">for</span> i<span class="token punctuation">,</span> v <span class="token operator">:=</span> <span class="token keyword">range</span> <span class="token operator">*</span>s <span class="token punctuation">{</span> <span class="token keyword">if</span> <span class="token function">isEqual</span><span class="token punctuation">(</span>value <span class="token punctuation">,</span>v<span class="token punctuation">)</span><span class="token punctuation">{</span> <span class="token keyword">if</span> <span class="token operator">!=</span><span class="token operator">=</span> <span class="token function">len</span><span class="token punctuation">(</span><span class="token operator">*</span>s<span class="token punctuation">)</span> <span class="token operator">-</span> <span class="token number">1</span> <span class="token punctuation">{</span> <span class="token operator">*</span>s <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token operator">*</span>s<span class="token punctuation">)</span><span class="token punctuation">[</span><span class="token punctuation">:</span>i<span class="token punctuation">]</span> <span class="token punctuation">}</span><span class="token keyword">else</span><span class="token punctuation">{</span> <span class="token operator">*</span>s <span class="token operator">=</span> <span class="token function">append</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token operator">*</span>s<span class="token punctuation">)</span><span class="token punctuation">[</span><span class="token punctuation">:</span>i<span class="token punctuation">]</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token operator">*</span>s<span class="token punctuation">)</span><span class="token punctuation">[</span>i <span class="token operator"> </span> <span class="token number">2</span><span class="token punctuation">]</span><span class="token operator">...</span><span class="token punctuation">)</span> <span class="token punctuation">}</span> <span class="token keyword">return</span> <span class="token punctuation">}</span> <span class="token punctuation">}</span> <span class="token punctuation">}</span> </code></pre> <pre><code>B、 </code></pre> <pre><code class="lang-go hljs"><span class="token keyword">func</span> <span class="token punctuation">(</span>s <span class="token operator">*</span>Slice<span class="token punctuation">)</span> <span class="token function">Remove</span><span class="token punctuation">(</span>value <span class="token keyword">interface</span><span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token keyword">for</span> i<span class="token punctuation">,</span> v <span class="token operator">:=</span> <span class="token keyword">range</span> <span class="token operator">*</span>s <span class="token punctuation">{</span> <span class="token keyword">if</span> <span class="token function">isEqual</span><span class="token punctuation">(</span>value<span class="token punctuation">,</span> v<span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token operator">*</span>s <span class="token operator">=</span> <span class="token function">append</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token operator">*</span>s<span class="token punctuation">)</span><span class="token punctuation">[</span><span class="token punctuation">:</span>i<span class="token punctuation">]</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token operator">*</span>s<span class="token punctuation">)</span><span class="token punctuation">[</span>i<span class="token operator"> </span><span class="token number">1</span><span class="token punctuation">:</span><span class="token punctuation">]</span><span class="token punctuation">)</span> <span class="token keyword">return</span> <span class="token punctuation">}</span> <span class="token punctuation">}</span> <span class="token punctuation">}</span> </code></pre> <pre><code>C、 </code></pre> <pre><code class="lang-go hljs"><span class="token keyword">func</span> <span class="token punctuation">(</span>s <span class="token operator">*</span>Slice<span class="token punctuation">)</span> <span class="token function">Remove</span><span class="token punctuation">(</span>value <span class="token keyword">interface</span><span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token keyword">for</span> i<span class="token punctuation">,</span> v <span class="token operator">:=</span> <span class="token keyword">range</span> <span class="token operator">*</span>s <span class="token punctuation">{</span> <span class="token keyword">if</span> <span class="token function">isEqual</span><span class="token punctuation">(</span>value<span class="token punctuation">,</span> v<span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token function">delete</span><span class="token punctuation">(</span><span class="token operator">*</span>s<span class="token punctuation">,</span> v<span class="token punctuation">)</span> <span class="token keyword">return</span> <span class="token punctuation">}</span> <span class="token punctuation">}</span> <span class="token punctuation">}</span> </code></pre> <pre><code>D、 </code></pre> <pre><code class="lang-go hljs"><span class="token keyword">func</span> <span class="token punctuation">(</span>s <span class="token operator">*</span>Slice<span class="token punctuation">)</span> <span class="token function">Remove</span><span class="token punctuation">(</span>value <span class="token keyword">interface</span><span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token keyword">for</span> i<span class="token punctuation">,</span> v <span class="token operator">:=</span> <span class="token keyword">range</span> <span class="token operator">*</span>s <span class="token punctuation">{</span> <span class="token keyword">if</span> <span class="token function">isEqual</span><span class="token punctuation">(</span>value<span class="token punctuation">,</span> v<span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token operator">*</span>s <span class="token operator">=</span> <span class="token function">append</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token operator">*</span>s<span class="token punctuation">)</span><span class="token punctuation">[</span><span class="token punctuation">:</span>i<span class="token punctuation">]</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token operator">*</span>s<span class="token punctuation">)</span><span class="token punctuation">[</span>i<span class="token operator"> </span><span class="token number">1</span><span class="token punctuation">:</span><span class="token punctuation">]</span><span class="token operator">...</span><span class="token punctuation">)</span> <span class="token keyword">return</span> <span class="token punctuation">}</span> <span class="token punctuation">}</span> <span class="token punctuation">}</span> </code></pre>答案：D
14.下面协议中，用于电子邮件email传输控制的是（）
<pre><code>A、SNMP B、SMTP C、HTTP D、HTML </code></pre>答案：B
15.在TCP/IP协议簇中，UDP协议工作在（）
<pre><code>A、应用层 B、传输层 C、网络互联层 D、网络接口层 </code></pre>答案：B
16.下列关于TCP说法正确的有（）
<pre><code>A、TCP提供稳定的传输服务 B、TCP有流量控制 C、TCP冗余性好 D、TCP提供对IP协议的可靠机制，流控制以及错误恢复功能 </code></pre>答案：A
17.完成TLS握手完整的过程需要下面哪些算法（）
<pre><code>A、密钥交换算法 B、对称加密算法 C、多点共识算法 D、消息认证算法 </code></pre>答案：AB
18.关于DNS协议以下说法错误的是（）
<pre><code>A、使用TCP协议进行传输 B、使用UDP协议进行传输 C、可以进行从域名到ip的解析 D、可以根据ip查询其使用的域名 </code></pre>答案：BCD
19.-5的二进制表示是（）
<pre><code>A、00000000 00000000 00000000 00000101 B、11111111 11111111 11111111 11111010 C、11111111 11111111 11111111 11111011 D、10000000 00000000 00000000 00000101 </code></pre>答案：C
20.索引是对数据库中一个或多个列的值进行排序的数据结构，以协助快速查询，更新数据库表中数据，以下对索引的特点描述错误的是（）
<pre><code>A、加快数据的检索速度 B、加速表和表之间的连接 C、在使用分组和排序子句进行数据检索时，并不会减少查询中分组和排序的时间 D、通过创建唯一性索引，可以保证数据库表中每一行数据的唯一性 </code></pre>答案：ABD
<h3>提高题</h3>21.简要说明在浏览器输入http://nyssl.com后发生了什么？
<pre><code>例子一： 1）在客户端浏览器中输入网址http://nyssl.com 2）发送到DNS（域名服务器）获得域名对应的WEB服务器的IP地址 3）有了IP后，客户端浏览器就可以与WEB服务器建立TCP（传输控制协议）连接 4）客户端浏览器向对应IP地址的WEB服务器发送相应的HTTP或HTTPS请求 5）WEB服务器收到客户端请求，返回给用户指定的URL数据或错误信息；如果设定重定向，则重定向到新的URL地址，重新开始第一步 6）客户端浏览器解析HTML源文件，解析的过程中实现对页面的排版，解析完成后，在浏览器中显示基础的页面 7）分析页面中的超链接（如图片，样式等也是一个URL），过程和以上过程类似，之后再显示在当前页面，重复以上过程直至没有超链接需要发送，完成页面的全部加载 例子二： 1）输入网址 2）缓存解析 3）域名解析 4）获取相应的IP 5）建立TCP连接三次握手 6）和服务器建立连接 7）浏览器发送HTTP请求数据包 8）浏览器渲染 9）生成CSS树和AST树，合成dom树 10）js请求 11）ajax查询 12）页面生成 13）断开连接4次握手 </code></pre>22.简述实现一个博客评论系统（类似disqus/多说等）的思路。
（提示：从技术选型，设计思路，数据库设计等方面作答）
1.Golang如何实现多态
<pre><code class="lang-go hljs"><span class="token keyword">package</span> main <span class="token keyword">import</span> <span class="token string">"fmt"</span> <span class="token keyword">type</span> AnimalIF <span class="token keyword">interface</span> <span class="token punctuation">{</span> <span class="token function">Sleep</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token function">Age</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token builtin">int</span> <span class="token function">Type</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token builtin">string</span> <span class="token punctuation">}</span> <span class="token keyword">type</span> Animal <span class="token keyword">struct</span> <span class="token punctuation">{</span> MaxAge <span class="token builtin">int</span> <span class="token punctuation">}</span> <span class="token comment">// ***********************************</span> <span class="token keyword">type</span> Cat <span class="token keyword">struct</span> <span class="token punctuation">{</span> Animal Animal <span class="token punctuation">}</span> <span class="token keyword">func</span> <span class="token punctuation">(</span>this <span class="token operator">*</span>Cat<span class="token punctuation">)</span> <span class="token function">Sleep</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> fmt<span class="token punctuation">.</span><span class="token function">Println</span><span class="token punctuation">(</span><span class="token string">"Cat need sleep"</span><span class="token punctuation">)</span> <span class="token punctuation">}</span> <span class="token keyword">func</span> <span class="token punctuation">(</span>this <span class="token operator">*</span>Cat<span class="token punctuation">)</span> <span class="token function">Age</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token builtin">int</span> <span class="token punctuation">{</span> <span class="token keyword">return</span> this<span class="token punctuation">.</span>Animal<span class="token punctuation">.</span>MaxAge <span class="token punctuation">}</span> <span class="token keyword">func</span> <span class="token punctuation">(</span>this <span class="token operator">*</span>Cat<span class="token punctuation">)</span> <span class="token function">Type</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token builtin">string</span> <span class="token punctuation">{</span> <span class="token keyword">return</span> <span class="token string">"Cat"</span> <span class="token punctuation">}</span> <span class="token comment">//************************************</span> <span class="token keyword">type</span> Dog <span class="token keyword">struct</span> <span class="token punctuation">{</span> Animal Animal <span class="token punctuation">}</span> <span class="token keyword">func</span> <span class="token punctuation">(</span>this <span class="token operator">*</span>Dog<span class="token punctuation">)</span> <span class="token function">Sleep</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> fmt<span class="token punctuation">.</span><span class="token function">Println</span><span class="token punctuation">(</span><span class="token string">"Dog need sleep"</span><span class="token punctuation">)</span> <span class="token punctuation">}</span> <span class="token keyword">func</span> <span class="token punctuation">(</span>this <span class="token operator">*</span>Dog<span class="token punctuation">)</span> <span class="token function">Age</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token builtin">int</span> <span class="token punctuation">{</span> <span class="token keyword">return</span> this<span class="token punctuation">.</span>Animal<span class="token punctuation">.</span>MaxAge <span class="token punctuation">}</span> <span class="token keyword">func</span> <span class="token punctuation">(</span>this <span class="token operator">*</span>Dog<span class="token punctuation">)</span> <span class="token function">Type</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token builtin">string</span> <span class="token punctuation">{</span> <span class="token keyword">return</span> <span class="token string">"Dog"</span> <span class="token punctuation">}</span> <span class="token comment">//************************************</span> <span class="token keyword">func</span> <span class="token function">facroty</span><span class="token punctuation">(</span>name <span class="token builtin">string</span><span class="token punctuation">)</span> AnimalIF <span class="token punctuation">{</span> <span class="token keyword">switch</span> name <span class="token punctuation">{</span> <span class="token keyword">case</span> <span class="token string">"Dog"</span><span class="token punctuation">:</span> <span class="token keyword">return</span> <span class="token operator">&</span>Dog<span class="token punctuation">{</span>Animal<span class="token punctuation">{</span>MaxAge<span class="token punctuation">:</span> <span class="token number">25</span><span class="token punctuation">}</span><span class="token punctuation">}</span> <span class="token keyword">case</span> <span class="token string">"Cat"</span><span class="token punctuation">:</span> <span class="token keyword">return</span> <span class="token operator">&</span>Cat<span class="token punctuation">{</span>Animal<span class="token punctuation">{</span>MaxAge<span class="token punctuation">:</span> <span class="token number">15</span><span class="token punctuation">}</span><span class="token punctuation">}</span> <span class="token keyword">default</span><span class="token punctuation">:</span> <span class="token function">panic</span><span class="token punctuation">(</span><span class="token string">"No such animal"</span><span class="token punctuation">)</span> <span class="token punctuation">}</span> <span class="token punctuation">}</span> <span class="token keyword">func</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> animal <span class="token operator">:=</span> <span class="token function">facroty</span><span class="token punctuation">(</span><span class="token string">"Dog"</span><span class="token punctuation">)</span> animal<span class="token punctuation">.</span><span class="token function">Sleep</span><span class="token punctuation">(</span><span class="token punctuation">)</span> fmt<span class="token punctuation">.</span><span class="token function">Printf</span><span class="token punctuation">(</span><span class="token string">"%s max age is: %d\n"</span><span class="token punctuation">,</span> animal<span class="token punctuation">.</span><span class="token function">Type</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> animal<span class="token punctuation">.</span><span class="token function">Age</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">}</span> </code></pre>2.Golang传递参数到方法有几种方式，及其各自的特点
值对象：
指针传递：地址传递效率高，因为数据量小
3.谈谈new和make的区别
<pre><code>new：只分配内存，new用于各种类型的内存分配，new只返回指针； make：只能用于 slice、map 和 channel 的初始化，make用于内建类型（Map、slice和channel）的内存分配，make返回初始化后的（非零）值 </code></pre>4.谈谈array和slice的区别
<pre><code>array：类型相同，长度固定的数据集合，长度无法修改；类型为——[len]T（len不能省略）；值是一段连续的内存区域和一些额外属性 slice：可以看做是内存的视图，展示内存的一段区域；类型为[]T；值是一个指向内存的数据结构，类似指向数组的指针 </code></pre>5.Context包的用途
<pre><code>context用于停止goroutine，协调多个goroutine的取消，设置超时取消等等。基于channel和select来实现停止，另外还可以用context在不同的goroutine中传递数据。其中停止goroutine是context的核心。 </code></pre>6.简述Golang中的协程
<pre><code>Go协程（Goroutine）是与其他函数同时运行的函数。可以认为Go协程是轻量级的线程，由Go运行时来管理。 在函数调用前加上go关键字，这次调用就会在一个新的goroutine中并发执行。当被调用的函数返回时，这个goroutine也自动结束。听着感觉像C# 中的Task。 需要注意的是，如果这个函数有返回值，那么这个返回值会被丢弃。 Go 协程（Goroutine）之间通过信道（channel）进行通信，简单的说就是多个协程之间通信的管道。信道可以防止多个协程访问共享内存时发生资源争抢的问题。 </code></pre>7.写出下面代码的输出结果
<pre><code class="lang-go hljs"><span class="token keyword">package</span> main <span class="token keyword">import</span> <span class="token string">"fmt"</span> <span class="token keyword">func</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token function">defer_call</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">}</span> <span class="token keyword">func</span> <span class="token function">defer_call</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token keyword">defer</span> <span class="token keyword">func</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> fmt<span class="token punctuation">.</span><span class="token function">Println</span><span class="token punctuation">(</span><span class="token string">"before print"</span><span class="token punctuation">)</span> <span class="token punctuation">}</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token keyword">defer</span> <span class="token keyword">func</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> fmt<span class="token punctuation">.</span><span class="token function">Println</span><span class="token punctuation">(</span><span class="token string">"printing..."</span><span class="token punctuation">)</span> <span class="token punctuation">}</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token keyword">defer</span> <span class="token keyword">func</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> fmt<span class="token punctuation">.</span><span class="token function">Println</span><span class="token punctuation">(</span><span class="token string">"after print"</span><span class="token punctuation">)</span> <span class="token punctuation">}</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token function">panic</span><span class="token punctuation">(</span><span class="token string">"Exception"</span><span class="token punctuation">)</span> <span class="token punctuation">}</span> </code></pre> <pre><code class="lang-go hljs">after <span class="token builtin">print</span> printing<span class="token operator">...</span> before <span class="token builtin">print</span> <span class="token builtin">panic</span><span class="token punctuation">:</span> Exception goroutine <span class="token number">1</span> <span class="token punctuation">[</span>running<span class="token punctuation">]</span><span class="token punctuation">:</span> main<span class="token punctuation">.</span><span class="token function">defer_call</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">/</span>home<span class="token operator">/</span>udi<span class="token operator">/</span>Udi_work_space<span class="token operator">/</span>Udi_ws_go<span class="token operator">/</span>ZipTest_backend<span class="token operator">/</span>main<span class="token punctuation">.</span><span class="token keyword">go</span><span class="token punctuation">:</span><span class="token number">13</span> <span class="token operator"> </span><span class="token number">0x70</span> main<span class="token punctuation">.</span><span class="token function">main</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">/</span>home<span class="token operator">/</span>udi<span class="token operator">/</span>Udi_work_space<span class="token operator">/</span>Udi_ws_go<span class="token operator">/</span>ZipTest_backend<span class="token operator">/</span>main<span class="token punctuation">.</span><span class="token keyword">go</span><span class="token punctuation">:</span><span class="token number">6</span> <span class="token operator"> </span><span class="token number">0x17</span> exit status <span class="token number">2</span> </code></pre>8.谈谈你对SOLID原则的理解
9.git rebase和git merge的区别
10.如果用户登录日志表包含user_id，log_time，session_id 等字段，请编写SQL查询近30天，每天平均登录用户数量
<pre><code class="lang-sql hljs"><span class="token keyword">select</span> <span class="token function">count</span><span class="token punctuation">(</span>user_id<span class="token punctuation">)</span> <span class="token keyword">as</span> num<span class="token punctuation">,</span> to_char<span class="token punctuation">(</span>log_time<span class="token punctuation">,</span> <span class="token string">'yyyy/mm/dd'</span><span class="token punctuation">)</span> <span class="token keyword">as</span> <span class="token keyword">date</span> <span class="token keyword">from</span> login_log <span class="token keyword">where</span> log_time <span class="token operator">between</span> sysdate<span class="token operator">-</span><span class="token number">30</span> <span class="token operator">and</span> sysdate <span class="token keyword">group</span> <span class="token keyword">by</span> to_char<span class="token punctuation">(</span>log_time<span class="token punctuation">,</span> <span class="token string">'yyyy/mm/dd'</span><span class="token punctuation">)</span> <span class="token keyword">order</span> <span class="token keyword">by</span> to_char<span class="token punctuation">(</span>log_time<span class="token punctuation">,</span> <span class="token string">'yyyy/mm/dd'</span><span class="token punctuation">)</span> <span class="token keyword">desc</span> </code></pre> 到此这篇关于“golang笔试题（实例）”的文章就介绍到这了,更多文章或继续浏览下面的相关文章，希望大家以后多多支持JQ教程网！您可能感兴趣的文章：
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