//MyShow.java
//用以被调用的不带包结构定义的类
public class MyShow {
    public String show() {
        return "None Package";
    }
}

//MyClass.java
//用以测试调用的类
package com.zcjl.test.base;

import java.lang.reflect.Method;

public class MyClass {
    public static void main(String[] args) {
        try {
            Object obj = Class.forName("MyShow").newInstance();
            Class clazz = obj.getClass();
            Method method = clazz.getMethod("show", null);
            String returnValue = (String) method.invoke(obj, null);
            System.out.println(returnValue);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}