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11.9 静态方法</div>
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方法也可以被声明成静态的。一个静态方法遵从于所有的类范围和访问规则，但在表现上它就像一个常规的子例程一样可以在类的外部被调用，即使没有该类的实例。一个静态方法不能访问非静态的成员（类属性和方法），但它可以直接访问静态类属性或调用同一个类的静态方法。在一个静态方法体内部访问非静态成员或访问特殊的this句柄是非法的，并且会导致一个编译错误。静态方法不能是虚拟的。 </p><div class="Element170">
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<div class="Element13"><div class="Element12" id="code00352"><pre class="Element12"><span style="color: #0000FF">class</span> id<span style="color: #800080">;</span>
<span style="color: #0000FF">static int</span> current <span style="color: #800080">=</span> <span style="color: #FF0000">0</span><span style="color: #800080">;</span>
<span style="color: #0000FF">static function int</span> next_id<span style="color: #800080">();</span>
next_id <span style="color: #800080">= ++</span>current<span style="color: #800080">;</span> <span style="color: #008000">// 正确，访问静态类属性</span>
<span style="color: #0000FF">endfunction</span>
<span style="color: #0000FF">endclass</span></pre></div></div>
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一个静态方法不同于一个具有静态生命周期的方法。前者指的是类内部的方法的生命周期，而后者指的是任务内部的参数和变量的生命周期。 </p><div class="Element170">
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<div class="Element13"><div class="Element12" id="code00353"><pre class="Element12"><span style="color: #0000FF">class</span> TwoTasks<span style="color: #800080">;</span>
<span style="color: #0000FF">static task</span> foo<span style="color: #800080">();</span> ... <span style="color: #0000FF">endtask</span> <span style="color: #008000">// 具有自动变量生命周期的静态类方法</span>
<span style="color: #0000FF">task</span> <span style="color: #0000FF">static</span> bar<span style="color: #800080">();</span> ... <span style="color: #0000FF">endtask</span> <span style="color: #008000">// 具有静态变量生命周期的非静态类方法</span>
<span style="color: #0000FF">endclass</span></pre></div></div>
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缺省情况下，类方法的参数和变量具有自动的生命周期。</p></div>
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