java 反射使用

package cn.haoju.reflections;

import java.lang.reflect.Method;
import java.util.ArrayList;

public class ReflectionDemo {

    public static void main(String[] args) throws Exception {
        ArrayList<Integer> arrayList = new ArrayList<Integer>();
        arrayList.add(3);
        //arrayList.add("lihao"); //编译不通过
        Class listClass = arrayList.getClass();
        Method method = listClass.getDeclaredMethod("add", Object.class);
        method.invoke(arrayList, "lisan");
        
        System.out.println(arrayList); //[3, lisan]

    }

}