* #tryAcquire} until success. This method can be used * to implement method {@link Lock#lock}. * * @param arg the acquire argument. This value is conveyed to * {@link #tryAcquire} but is otherwise uninterpreted and * can represent anything you like. */publicfinalvoidacquire(int arg){i...
final (常量:对象只能一次赋值操作) 示例 publicclassDefaultResourceLoaderimplementsResourceLoader{//加载资源的类加载器@NullableprivateClassLoader classLoader;# 用于存储注册的协议解析器privatefinalSet<ProtocolResolver> protocolResolvers =newLinkedHashSet(4);# 缓存已加载的资源privatefinalMap<Class<?>, Map<Resou...
编译会通过, 但是final类不能被继承, 所以里面定义final无业务上的意义. 但是貌似会轻微加快编译和运行速度. 2.2.3 final 和 abstract 关键字不能一齐使用 也就是无论类或方法, 都不能同时是抽象的也是final的. 2.2.4 private方法会被认为是final方法. 也就是说private 方法不能被继承和重写. 但是还是有区别...
The same is true forabstract methods, you cannot make the final in Java. An abstract method must be overridden to be useful and called but when you make theabstract methodfinal it cannot be overridden in Java, hence there would be no way to use that method. This is why making anabstract...
@OverrideprotectedfinalvoidrefreshBeanFactory()throws BeansException{//如果beanFactory已经存在,就销毁context管理的所有bean,并关闭beanFactoryif(hasBeanFactory()){//其实就是调用一些集合的clear方法,解除对一些实例的引用,参考DefaultSingletonBeanRegistry.destroySingletons方法destroyBeans();//关闭当前的beanFactory,其实...
HandlerMethodMappingNamingStrategy.java MappedInterceptor.java MatchableHandlerMapping.java RequestMatchResult.java SimpleMappingExceptionResolver.java SimpleServletHandlerAdapter.java SimpleServletPostProcessor.java SimpleUrlHandlerMapping.java U...
I am non abstract method in the abstract class. I override from abstract class 从上面的例子可以看到,抽象类可以有构造器,有抽象方法和非抽象方法,可以有变量。非抽象方法,子类可以直接继承;而抽象方法子类必须实现。 2.2 使用场景1 abstract class Shape{ abstract void draw(); } class Circle extends Shape...
//This method does not otherwise impose any synchronization or {@code volatile} field accesses. protected final Thread getExclusiveOwnerThread() { return exclusiveOwnerThread; } } 即使AbstractQueuedSynchronizer类基于一个内部FIFO队列,它也不会自动执行FIFO获取策略。独占模式同步的核心是:Acquire...
be included in a separate supplementary file for online publication. However, each method must be ...
String getFactoryMethodName(); ConstructorArgumentValues getConstructorArgumentValues();defaultbooleanhasConstructorArgumentValues() {return!getConstructorArgumentValues().isEmpty(); } MutablePropertyValues getPropertyValues();defaultbooleanhasPropertyValues() {return!getPropertyValues().isEmpty(); ...