如何为任意类的数组的类编写文字

时间:2016-12-13 00:13:49

标签: java reflection literals

如何使用文字来定义java.lang.Class.getMethod的参数类型?

    public class NewTester
    {
        public static void main(String[] args)
        {   
            System.out.println("START");
            Worker myWorker = new Worker();
            Thing[] argument = new Thing[] { new Thing("book"), 
                                             new Thing("pencil") };
            Object[] arguments = new Object[] { argument };

                            // HOW ABOUT LITERALS HERE INSTEAD OF getClass
            Class<?>[] parameterTypes = new Class<?>[] { argument.getClass() }; 

            Method myMethod;
            try
            {
              myMethod = myWorker.getClass().getMethod("work", parameterTypes);
            } 
            catch (NoSuchMethodException | SecurityException e)
            {
              throw new RuntimeException(e);
            }
            try
            {
              myMethod.invoke(myWorker, arguments);
            } 
            catch (IllegalAccessException | 
                   IllegalArgumentException | 
                   InvocationTargetException e)
            {
              throw new RuntimeException(e);
            }
            System.out.println("END");
        }

        private static class Worker
        {
            @SuppressWarnings("unused")
            public void work(Thing[] argument)
            {
                assert argument.length == 2;
                assert argument[0].value.equals("book");
                assert argument[1].value.equals("pencil");
            }
        }

        private static class Thing
        {
            String value;
            Thing(String value)
            {
                this.value = value;
            }
        }
    }

我尝试了以下操作,但在使用NoSuchMethodException的getMethod调用中失败。

Class<?>[] parameterTypes = new Class<?>[] { java.lang.reflect.Array.class };

1 个答案:

答案 0 :(得分:1)

要获得代表某些Class的{​​{1}}字面值,您可以撰写Type

对于数组,请使用Type.class