石头记 - 魔都生活记录

发表于2018-10-08|java

Java generic（泛型）笔记 extends 和 super123public static <T extends Comparable<? super T>> void sort(List<T> list) { list.so...

发表于2018-10-07|Java

Java InputStream read返回int 问题InputStream 操作的是字节流，read字面上理解应该返回字节，为什么api中返回的是int 123456789public abstract int read() throws IOExcep...

发表于2018-10-07|java

Java volatile volatile 语义内存可见性，不保证原子性（++i）禁止指令重排 (单例设计模式) 保证double/long的读写原子性（不然32bit+32bit操作会有不一致）关于第三点，可以参考jls 1234567891017.7. Non-atom...

发表于2018-10-05|java

getMethods和getDeclaredMethods的区别 getMethods public Method[] getMethods() throws SecurityExceptionReturns an array containing Meth...

发表于2018-10-03|Java

java对象内存layout Class : A pointer to the class information, which describes the object type. In the case of a java.lang.Integer object, for example...

发表于2018-09-24|收藏

收藏的链接地址 Java泛型

发表于2018-09-23|Java

Java类型转换前一般有三种方式进行类型检查 isAssignableFrom isInstance instanceof isAssignableFromX.class.isAssignableFrom(Y.class) If X and Y are the same class, o...

发表于2018-09-14|java annotation

Java annotation只能从超类继承不能从接口继承 Javadoc Indicates that an annotation type is automatically inherited. If an Inherited meta-annotation is present on ...

发表于2018-09-10|mysql8

升级到mysql8以后，原有的Mysql Workbench连接出现下面的异常 1Authentication plugin 'caching_sha2_password' cannot be loaded: dlopen(/usr/local/mysql/lib/plug...

发表于2018-09-02|java

如何动态获取java参数名 java 8Java 8中可以在编译时添加参数javac -parameters，再通过reflection获取 123456789101112131415161718public class Boundary { public void hello...