第2讲 Java语法基础(11)

1.2 and Reserved Words 绪Keyword 论The following are class, method, and/or variable modifiers: abstract Used to declare a class that cannot be instantiated, or a method that must be implemented by a nonabstract subclass. (抽 象类：不可建立实例；抽象方法：必由非抽象子类予以实现) final Makes it impossible to extend a class, override a method, or reinitialize a variable. (最终类：不可继承；最终方法：不可重载；最 终变量：不能再次初始化) class Keyword used to specify a class. interface Keyword used to specify an interface. (接口类) extends Used to indicate the superclass that a subclass is extending. (扩展：指定被继承的超类) implements Used to indicate the interfaces that a class will implement. (实现：指定被实现的接口类) new Used to instantiate an object by invoking the constructor. (激活构造方法，实例出一个对象) Java Programming, spring, 2012