我有一组非常相似的类。目前我正在使用反射访问并调用下面的选择方法。我需要的是myList
参数。我尝试过使用代理但是,我是Java的初学者,不了解如何实现和使用它们。
public int choose(List<Object> myList, Object card, Object color, State state)
{
int answer = -1;
// sort through myList and set answer to index of desired object
return answer;
}
有没有更好的方法在不使用AspectJ的情况下在Java中获取此参数?如果是这样,你能提供一个例子吗?
感谢您的帮助。
答案 0 :(得分:0)
class State
{
}
class MyClass
{
public int choose(List<Object> myList, Object card, Object color, State state)
{
int answer = -1;
System.out.println("myList has " + myList.size() + " elements");
for (Object o : myList)
{
System.out.println("element -> " + o);
}
// sort through myList and set answer to index of desired object
return answer;
}
}
public static int InvokeChoose(Object obj) throws NoSuchMethodException, InvocationTargetException, IllegalAccessException
{
Method m = obj.getClass().getDeclaredMethod("choose", List.class, Object.class, Object.class, State.class);
List<Object> someList = new ArrayList<>();
someList.add(Integer.valueOf(0));
someList.add(Integer.valueOf(1));
someList.add(Integer.valueOf(2));
Object result = m.invoke(obj, someList, new Object(), new Object(), new State());
return ((Number)result).intValue();
}
public static void TryIt()
{
MyClass c = new MyClass();
try
{
int result = InvokeChoose(c);
System.out.println("the result is: " + result);
}
catch (Throwable e)
{
e.printStackTrace();
}
}
输出:
myList has 3 elements
element -> 0
element -> 1
element -> 2
the result is: -1