Polymorphism is the ability of an object to take on many forms. Polymorphism is an important feature of Java OOPs concept and it allows us to perform multiple operations by using the single name of any method (interface). Any Java object that can pass more than one IS-A test is ...
publicinterface 接口名称 {// 抽象方法// 默认方法// 静态方法} 接口中定义抽象方法 抽象方法:使用 abstract 关键字修饰,可以省略,没有方法体。该方法供子类实现使用。 publicinterfaceInterFaceName{publicabstractvoidmethod(); } 接口中定义默认方法和静态方法 默认方法:使用 default 修饰,不可省略,供子类调用或者...
public interface 接口名.java → 接口名.class 1.2-接口的定义格式(记忆) 定义格式:关键字 interface public interface 接口名称 { // 抽象方法 // 默认方法 // 静态方法 } 接口中定义抽象方法 抽象方法:使用abstract关键字修饰,可以省略,没有方法体。该方法供子类实现使用。 public interface InterFaceName { pu...
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Polymorphism lets you program in the abstract by creating uniform interfaces to different kinds of operands, arguments, and objects. In this article, you discovered subtype polymorphism, in which a type can serve as another type’s subtype. You also learned that subtype polymorphism relies on upcas...
命令行接口(command-line interface):一种计算机交互方法。用户向计算机输入命令,计算机对每个命令进行响应。 注释(comment):在一个计算机程序中,注释是那些被计算机忽略的文本。注释的目的是方便人们阅读,帮助理解程序。 编译器(compiler):编译器是一种计算机程序,将某种计算机语言(通常是高级语言)编写的程序翻译成机器语...
接口(interface):对如何使用类似子程序这样的黑盒子一种通用说法。接口对其内部发生的情况没有提供任何信息。“interface”同时也是Java中的保留字。从这个意义上说,接口是一种定义了一个或多个抽象方法的类型。实现该接口的对象必须提供这些方法的定义。解释器(interpreter):一种执行程序的计算机程序,被执行的程序由某种...
();// Call base-class version}// Add methods to the interface:publicvoidfoam(){append(" foam()");}// Test the new class:publicstaticvoidmain(String[]args){Detergent x=newDetergent();x.dilute();x.apply();x.scrub();x.foam();System.out.println(x);System.out.println("Testing base...
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