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                # 1. 介紹 在`Kotlin`中類似的可以有反射,可以通過下面幾種方式: ~~~kotlin val password = 類的實例 // 直接通過對象來獲取 val clazz1 = password.javaClass // 通過Class.forName來獲取 val clazz2 = Class.forName("com.example.kotlinstudy.reflect.Password") // 通過類直接獲取 val clazz3 = 類::class.java ~~~ 然后,類似的可以用`getDeclaredField(fieldname)`方法可以獲取所有的字段`Field`,用`getDeclaredMethod`來獲取其方法。 # 2. 案例 ~~~ override fun onPrepareOptionsMenu(menu: Menu?): Boolean { if (menu is MenuBuilder) { val clazz = menu.javaClass val declaredMethod = clazz.getDeclaredMethod("setOptionalIconsVisible", Boolean::class.java) declaredMethod.isAccessible = true declaredMethod.invoke(menu, true) } return super.onPrepareOptionsMenu(menu) } ~~~
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