```java Lock lock = new ReentrantLock(); public int getNext(){ lock.loc...

JSON Object enclosed within braces, { } – Example: { "name": "html", "ye...

Reflection A way for a program/application to learn about itself, change...

Proxy 代理角色：代理对象内部含有目标对象的引用，从而可以在任何时候操作目标对象；代理对象提供一个与目标对象相同的接口，以便可以在任何时候替...

JVM 通过在实际的计算机上仿真模拟各种计算机功能来实现的。由一套字节码指令集、一组寄存器、一个栈、一个垃圾回收堆和一个存储方法域等组成。JVM...

File An abstract representation of file and directory pathnames. public ...

Generic Note that type parameters can represent only reference types, no...

Collection 是一个接口 The JDK does not provide any direct implementations of ...

Annotation attached with class, interface, methods, fields annotation的内容...