java中invoke方法三个参数_java method.invoke通过反射调用可变参数个数的方法

public class Reflect {

public static void main(String[] args) throws Exception {

Class> clazz = Single.class;

Single single = (Single) clazz.newInstance();

List list = new ArrayList(){

private static final long serialVersionUID = 1L;

{

add("fuck");

add("ni");

add("mei");

}

};

//获取method两种方式， 在method中 数组的的空间大小是可以随便写的不一定使用0

/* 1 */

Method method = clazz.getDeclaredMethod("method", Array.newInstance(Object.class, 0).getClass());

/* 2 */

method = clazz.getDeclaredMethod("method", (new Object[0]).getClass());

//初始化参数

/* 1 */

Object objs = Array.newInstance(Object.class, 2);

Array.set(objs, 0, list);

Array.set(objs, 1, "23");

method.invoke(single, objs);

/* 2 */

Object[] objects = {1, "fuck", list};

method.invoke(single, new Object[]{ objects });

}

}

class Single {

public void method(Object... objs) {

System.out.println(Arrays.deepToString(objs));

}

}

结果:

[[fuck, ni, mei], 23]

[1, fuck, [fuck, ni, mei]]