ArrayList list = new ArrayList();在这个泛型为 Integer 的 ArrayList 中存放一个 String 类型的对象。

package com.heima.test;

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

public class Test2 {

    /**
        ArrayList list = new ArrayList();在这个泛型为 Integer 的 ArrayList
        中存放一个 String 类型的对象。
     * @param args
     * @throws SecurityException 
     * @throws NoSuchMethodException 
     * @throws InvocationTargetException 
     * @throws IllegalArgumentException 
     * @throws IllegalAccessException 
     */
    public static void main(String[] args) throws NoSuchMethodException, SecurityException, IllegalAccessException, IllegalArgumentException, InvocationTargetException {
        ArrayList list = new ArrayList();
        Class clazz = ArrayList.class;
        Method me = clazz.getMethod("add", Object.class);
        me.invoke(list, "heima");
        System.out.println(list);
    }

}