SetProperty accepts three parameters.
SetProperty 接受三个参数。
Sometimes beans have getproperty and setproperty methods instead.
而有时 Beans 有 getproperty 和 setproperty 方法。
setProperty is invoked for any property setter that doesn't actually exist in an object.
setProperty针对对象中实际上不存在的任何属性设置程序调用。
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