Java-反射，转换为未知对象？ [英] Java - Reflection, casting to an unknown Object?

问题描述

基本上，我浏览了JFrame中的所有组件，检查它是否具有方法setTitle（String arg0），如果有，则将其标题设置为 foo。但是，为了设置标题，我需要将其转换为合适的对象。

Basically, I scan through all components in a JFrame, checking if it has the method setTitle(String arg0), if it does, then set it's title to "foo". However, in order to set it's title I need to cast it to a suitable object.

    public void updateTitle(Container root){

        for (Component c : root.getComponents()){

            String s = "";
            for (Method m : c.getClass().getDeclaredMethods()){

                s += m.getName();
            }

            if (s.contains("setTitle")){                

                c.setTitle("foo"); //Here is where I need the casting 
            }

            if (c instanceof Container){

                updateTitle((Container) c);
            }
        }           
    }

问题是，我不不知道这是什么课。有什么方法可以将其强制转换为自身，还是我应该尝试做其他事情？

Problem is, I don't know what class is it. Is there any way to cast it to itself, or I should try doing something else?

推荐答案

当您拥有方法，您可以使用 invoke（）进行调用：

When you have a Method, you can use invoke() to call it:

 for (Method m : c.getClass().getDeclaredMethods()){
     if( "setTitle".equals( m.getName() ) {
         m.invoke( c, "foo" ); // == c.setTitle("foo"); but without the casts
     }
 }

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