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+# 代码参考:https://blog.csdn.net/feigeswjtu/article/details/78741245
+
 参考:https://blog.csdn.net/javazejian/article/details/56267036#%E5%9F%BA%E4%BA%8Easpect-spring-aop-%E5%BC%80%E5%8F%91
 * aop是一种编程范式,面向切面编程.比如鉴权/打印日志等等场景.
 * 什么是aop:https://www.zhihu.com/question/24863332
 * spring aop基于动态代理:jdk proxy和Cglib. 在使用时机上进行动态调整,当有接口时,使用jdk proxy,否则使用 cglib.
 * jdk proxy:被代理类必须实现接口.
+* cglib proxy:使用了继承代理.
 * 动态代理的底层是通过反射来实现的,通过反射拿到被代理类和它的实现类,然后生成代理类,去执行我们的切面逻辑.
 * Filter和Inteceptor是责任链模式,spring aop是代理模式.
 
+* aspectj采用的是编译的时候生成代理类,需要专门的织入工具; spring aop是使用的动态织入. 静态织入效率会更高,不用运行的时候,每次去织入.
+
 
 # aop中的关键概念
 * aspect:切面,具体的需要切入的逻辑;
 
@@ -0,0 +1,28 @@
+package com.tencent.javabase;
+
+/**
+ *
+ * https://blog.csdn.net/boatalways/article/details/17121205
+ * Created by walker on 2019/7/20.
+ */
+public class FloatTest {
+    public static void main(String[] args) {
+        testFloat();
+    }
+
+    private static void testFloat() {
+        System.out.println(0.99999999f == 1);
+
+        float a= 0.8f;
+        float b= 0.1f;
+        float c = a+b;
+        System.out.println(a);
+        System.out.println(b);
+        System.out.println(c);
+
+
+        System.out.println(0.4*0.2);
+
+        System.out.println(40000000.0f == 40000000.5f); // float类型字面量
+    }
+}