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interfaces.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Go by Example မြန်မာဘာသာ: Interfaces</title>
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<div class="example" id="interfaces">
<h2><a href="./">Go by Example မြန်မာဘာသာ</a>: Interfaces</h2>
<table>
<tr>
<td class="docs">
<p><em>Interface</em> တွေဆိုတာ method signature တွေကို ပေါင်းပြီး အမည်ပေးထားတာပါ။</p>
</td>
<td class="code empty leading">
</td>
</tr>
<tr>
<td class="docs">
</td>
<td class="code leading">
<a href="https://go.dev/play/p/AjbqQjEL5XK"><img title="Run code" src="play.png" class="run" /></a><img title="Copy code" src="clipboard.png" class="copy" />
<pre class="chroma"><span class="kn">package</span> <span class="nx">main</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
</td>
<td class="code leading">
<pre class="chroma"><span class="kn">import</span> <span class="p">(</span>
<span class="s">"fmt"</span>
<span class="s">"math"</span>
<span class="p">)</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>ဒီမှာ ဂျီသြမေတီပုံသဏ္ဍာန်တွေအတွက် အခြေခံ interface တစ်ခုကို သတ်မှတ်ထားပါတယ်။</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="kd">type</span> <span class="nx">geometry</span> <span class="kd">interface</span> <span class="p">{</span>
<span class="nf">area</span><span class="p">()</span> <span class="kt">float64</span>
<span class="nf">perim</span><span class="p">()</span> <span class="kt">float64</span>
<span class="p">}</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>ဥပမာအနေနဲ့ ဒီ interface ကို <code>rect</code> နဲ့ <code>circle</code> type တွေမှာ
implement လုပ်ပါ့မယ်။</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="kd">type</span> <span class="nx">rect</span> <span class="kd">struct</span> <span class="p">{</span>
<span class="nx">width</span><span class="p">,</span> <span class="nx">height</span> <span class="kt">float64</span>
<span class="p">}</span>
<span class="kd">type</span> <span class="nx">circle</span> <span class="kd">struct</span> <span class="p">{</span>
<span class="nx">radius</span> <span class="kt">float64</span>
<span class="p">}</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>Go မှာ interface တစ်ခုကို implement လုပ်ဖို့ဆိုရင် interface ထဲက method အားလုံးကို
implementလုပ်ဖို့ပဲ လိုပါတယ်။ ဒီမှာ <code>rect</code> အတွက် <code>geometry</code> interface ကို implement လုပ်ထားပါတယ်။</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="kd">func</span> <span class="p">(</span><span class="nx">r</span> <span class="nx">rect</span><span class="p">)</span> <span class="nf">area</span><span class="p">()</span> <span class="kt">float64</span> <span class="p">{</span>
<span class="k">return</span> <span class="nx">r</span><span class="p">.</span><span class="nx">width</span> <span class="o">*</span> <span class="nx">r</span><span class="p">.</span><span class="nx">height</span>
<span class="p">}</span>
<span class="kd">func</span> <span class="p">(</span><span class="nx">r</span> <span class="nx">rect</span><span class="p">)</span> <span class="nf">perim</span><span class="p">()</span> <span class="kt">float64</span> <span class="p">{</span>
<span class="k">return</span> <span class="mi">2</span><span class="o">*</span><span class="nx">r</span><span class="p">.</span><span class="nx">width</span> <span class="o">+</span> <span class="mi">2</span><span class="o">*</span><span class="nx">r</span><span class="p">.</span><span class="nx">height</span>
<span class="p">}</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p><code>circle</code> အတွက် implement လုပ်ထားတာပါ</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="kd">func</span> <span class="p">(</span><span class="nx">c</span> <span class="nx">circle</span><span class="p">)</span> <span class="nf">area</span><span class="p">()</span> <span class="kt">float64</span> <span class="p">{</span>
<span class="k">return</span> <span class="nx">math</span><span class="p">.</span><span class="nx">Pi</span> <span class="o">*</span> <span class="nx">c</span><span class="p">.</span><span class="nx">radius</span> <span class="o">*</span> <span class="nx">c</span><span class="p">.</span><span class="nx">radius</span>
<span class="p">}</span>
<span class="kd">func</span> <span class="p">(</span><span class="nx">c</span> <span class="nx">circle</span><span class="p">)</span> <span class="nf">perim</span><span class="p">()</span> <span class="kt">float64</span> <span class="p">{</span>
<span class="k">return</span> <span class="mi">2</span> <span class="o">*</span> <span class="nx">math</span><span class="p">.</span><span class="nx">Pi</span> <span class="o">*</span> <span class="nx">c</span><span class="p">.</span><span class="nx">radius</span>
<span class="p">}</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p>Variable တစ်ခုက interface type ဖြစ်နေရင် အဲဒီ interface ထဲက method တွေကို ခေါ်သုံးလို့ရပါတယ်။
ဒီမှာ <code>measure</code> ဆိုတဲ့ generic function တစ်ခုက ဒီအချက်ကို အသုံးချပြီး
မည်သည့် <code>geometry</code> function မဆို အလုပ်လုပ်နိုင်အောင် ရေးထားပါတယ်။</p>
</td>
<td class="code leading">
<pre class="chroma">
<span class="kd">func</span> <span class="nf">measure</span><span class="p">(</span><span class="nx">g</span> <span class="nx">geometry</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">fmt</span><span class="p">.</span><span class="nf">Println</span><span class="p">(</span><span class="nx">g</span><span class="p">)</span>
<span class="nx">fmt</span><span class="p">.</span><span class="nf">Println</span><span class="p">(</span><span class="nx">g</span><span class="p">.</span><span class="nf">area</span><span class="p">())</span>
<span class="nx">fmt</span><span class="p">.</span><span class="nf">Println</span><span class="p">(</span><span class="nx">g</span><span class="p">.</span><span class="nf">perim</span><span class="p">())</span>
<span class="p">}</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
</td>
<td class="code leading">
<pre class="chroma"><span class="kd">func</span> <span class="nf">main</span><span class="p">()</span> <span class="p">{</span>
<span class="nx">r</span> <span class="o">:=</span> <span class="nx">rect</span><span class="p">{</span><span class="nx">width</span><span class="p">:</span> <span class="mi">3</span><span class="p">,</span> <span class="nx">height</span><span class="p">:</span> <span class="mi">4</span><span class="p">}</span>
<span class="nx">c</span> <span class="o">:=</span> <span class="nx">circle</span><span class="p">{</span><span class="nx">radius</span><span class="p">:</span> <span class="mi">5</span><span class="p">}</span>
</pre>
</td>
</tr>
<tr>
<td class="docs">
<p><code>circle</code> နဲ့ <code>rect</code> struct type နှစ်ခုစလုံးက <code>geometry</code> interface ကို
implement လုပ်ထားတဲ့အတွက် သူတို့ရဲ့ instance တွေကို <code>measure</code> function ရဲ့
argument အဖြစ် သုံးလို့ရပါတယ်။</p>
</td>
<td class="code">
<pre class="chroma">
<span class="nf">measure</span><span class="p">(</span><span class="nx">r</span><span class="p">)</span>
<span class="nf">measure</span><span class="p">(</span><span class="nx">c</span><span class="p">)</span>
<span class="p">}</span>
</pre>
</td>
</tr>
</table>
<table>
<tr>
<td class="docs">
</td>
<td class="code leading">
<pre class="chroma"><span class="gp">$</span> go run interfaces.go
<span class="go">{3 4}
</span><span class="go">12
</span><span class="go">14
</span><span class="go">{5}
</span><span class="go">78.53981633974483
</span><span class="go">31.41592653589793</span></pre>
</td>
</tr>
<tr>
<td class="docs">
<p>Go ရဲ့ interface တွေအကြောင်း ပိုမိုလေ့လာချင်ရင်
ဒီ <a href="https://jordanorelli.tumblr.com/post/32665860244/how-to-use-interfaces-in-go">great blog post</a> ကို ဖတ်ကြည့်ပါ။</p>
</td>
<td class="code empty">
</td>
</tr>
</table>
<p class="next">
နောက်ဥပမာ: <a href="struct-embedding">Struct Embedding</a>.
</p>
<p class="footer">
by <a href="https://markmcgranaghan.com">Mark McGranaghan</a> နှင့် <a href="https://eli.thegreenplace.net">Eli Bendersky</a> | <a href="https://github.com/mmcgrana/gobyexample">source</a> | <a href="https://github.com/mmcgrana/gobyexample#license">license</a>
</p>
</div>
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