解釋
在java中Class.forName()和ClassLoader均可以對類進行加載。ClassLoader就是遵循雙親委派模型最終調用啓動類加載器的類加載器，實現的功能是「經過一個類的全限定名來獲取描述此類的二進制字節流」，獲取到二進制流後放到JVM中。Class.forName()方法實際上也是調用的CLassLoader來實現的java
Class.forName(String className)；這個方法的源碼是spa
<tbody><tr><td class="gutter"><div class="line number1 index0 alt2">1</div><div class="line number2 index1 alt1">2</div><div class="line number3 index2 alt2">3</div><div class="line number4 index3 alt1">4</div><div class="line number5 index4 alt2">5</div><div class="line number6 index5 alt1">6</div></td><td class="code"><div class="container"><div class="line number1 index0 alt2"><code class="java color1">@CallerSensitive</code></div><div class="line number2 index1 alt1"><code class="java spaces"> </code><code class="java keyword">public</code> <code class="java keyword">static</code> <code class="java plain">Class<?> forName(String className)</code></div><div class="line number3 index2 alt2"><code class="java spaces"> </code><code class="java keyword">throws</code> <code class="java plain">ClassNotFoundException {</code></div><div class="line number4 index3 alt1"><code class="java spaces"> </code><code class="java plain">Class<?> caller = Reflection.getCallerClass();</code></div><div class="line number5 index4 alt2"><code class="java spaces"> </code><code class="java keyword">return</code> <code class="java plain">forName0(className, </code><code class="java keyword">true</code><code class="java plain">, ClassLoader.getClassLoader(caller), caller);</code></div><div class="line number6 index5 alt1"><code class="java spaces"> </code><code class="java plain">}</code></div></div></td></tr></tbody>