反射类的方法（其中main方法比较特殊）

package reflet;

import java.util.List;

public class person {
    public String name="hahaah";
    
    public void aa1()//方法
    {
        System.out.println("aa1");
    }
    public void aa1(String name,int password)
    {
        System.out.println(name+":"+password);
    }
    public Class[] aa1(String name,int[] password)
    {
        return new Class[]{String.class};
    }
    private static void aa1(int num)
    {
        System.out.println(num);
    }
    public static void main(String[] args)
    {
        System.out.println("main!!!");
    }

}

package reflet;

import java.lang.reflect.Method;

import org.junit.Test;

public class demo2 {
    //反射类的方法：public void aa1(){}
    @Test
    public void test1() throws Exception
    {
        person p=new person();
        Class clazz=Class.forName("reflet.person");//加载类
        Method method=clazz.getMethod("aa1", null);
        method.invoke(p,null);//让方法跑起来，得有p对象才能跑
    }
    //反射类的方法：public void aa1(String name,int password)
        @Test
        public void test2() throws Exception
        {
            person p=new person();
            Class clazz=Class.forName("reflet.person");//加载类
            Method method=clazz.getMethod("aa1", String.class,int.class);
            method.invoke(p,"hemaoyun",23);//让方法跑起来，得有p对象才能跑
        }
        //反射类的方法：public Class[] aa1(String name,int[] password)
        @Test
        public void test3() throws Exception
        {
            person p=new person();
            Class clazz=Class.forName("reflet.person");//加载类
            Method method=clazz.getMethod("aa1", String.class,int[].class);
            Class ca[]=(Class[]) method.invoke(p,"hemaoyun",new int[]{1,2,4,5});//让方法跑起来，得有p对象才能跑
            System.out.println(ca[0]);
        }
        //反射类的方法：private static void aa1(int num)
                @Test
                public void test4() throws Exception
                {
                    person p=new person();
                    Class clazz=Class.forName("reflet.person");//加载类
                    Method method=clazz.getDeclaredMethod("aa1", int.class);
                    method.setAccessible(true);
                    method.invoke(p,57);//让方法跑起来，得有p对象才能跑
                   
                }
                //反射类的方法：public static void main(String[] args)
                @Test
                public void test5() throws Exception
                {
                    person p=new person();
                    Class clazz=Class.forName("reflet.person");//加载类
                    Method method=clazz.getDeclaredMethod("main", String[].class);
                    method.invoke(null,(Object)new String[]{"we","you"});
                    //记住，反射类调用main方法时，前面加上object强转下，这是版本升级兼容性问题。
                    //因为main方法是静态的，所以不需要对象p
                    
                   
                }

}