关于java中的invoke反射过程几点疑惑

Answer 1

1. This is a generic Class<?> c = A.class ? It can be any type, such as ArrayList array = new ArrayList(); array.add(1); or array.add("1"); Yes, but the data type you put in this ArrayList is obviously messed up. Such data is unsafe and has no value, so it must be as follows ArrayList<String> array=new ArrayList<String>(); At this time, your array.add(1); An error will be reported and int type data cannot be stored. 2. Compilation does not report an error but a warning. Warn error is different. 3. After modifying the parameters as shown in the figure, there will be no warning.

Answer 2

In fact, just write it like this.

public static void main(String[] args) {
        A a1 = new A();
        Class<?> c = A.class;
        try {
            Method m = c.getMethod("print", int.class, int.class);
            Object o = m.invoke(a1, 10, 20);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

Why passInteger[]会有警告，因为参数类型是Object....