classSup{publicint x,y;Sup(int a,int b){x=a;y=b;}publicvoiddisplay(){int z;z=x+y;System.out.println("add="+z);}}classSubextendsSup{Sub(int a,int b){super(a,b);}publicvoiddisplay(){int z;z=x*y;System.out.println("product="+z);}}//diaplay()在编译时不能被系统识别,...
}// sub classClass ManagerextendsEmployee{ ...@Overridepublicbooleanequals(Object otherObject){if(!super.equals(otherObject))returnfalse;// super.equals checked that this and otherObject belong to the same classManagerother=(Manager) otherObject;// test whether the fields have identical values in ...
public class Test { public static void main(String[] args) { show(new Cat()); // 以 Cat 对象调用 show 方法 show(new Dog()); // 以 Dog 对象调用 show 方法 Animal a = new Cat(); // 向上转型 a.eat(); // 调用的是 Cat 的 eat Cat c = (Cat)a; // 向下转型 c.work(); /...
// TODO Auto-generated method stub BaseClass base=newBaseClass(); System.out.println(base.book); base.test(); base.base(); Polymorphism subclass=newPolymorphism(); System.out.println(subclass.book); subclass.test(); subclass.sub(); //test是上转型对象 BaseClass test=newPolymorphism(); //...
classBase{publicdouble size;publicString name;publicBase(double size,String name){this.size=size;this.name=name;}} 代码语言:javascript 代码运行次数:0 运行 AI代码解释 publicclassSubextendsBase{publicString color;publicSub(double size,String name,String color){//在子类构造器中调用父类构造器,使用supe...
In java, polymorphism is divided into method overloading and method overriding. Another term, operator overloading, is also there. For example, the“+”operator can be used to add two integers as well as concat two sub-strings. Well, this is the only available support for operator overload...
Polymorphism can be demonstrated with a minor modification to theBicycleclass. For example, aprintDescriptionmethod could be added to the class that displays all the data currently stored in an instance. public void printDescription(){ System.out.println("\nBike is " + "in gear " + this.gea...
注释:前缀 “超”(super) 和 “子”(sub) 来源于计算机科学与数学理论中集合语言的术语。所有员工组成的集合包含所有经理组成的集合。可以这样说,员工集合是经理集合的超集,也可以说,经理集合是员工集合的子集。 在Manager 类中,增加了一个用于存储奖金信息的字段,以及一个用于设置这个字段的新方法 : ...
class 类别 type 型别 ● 我喜欢「化」: generalized 泛化 specialized 特化 overloaded 多载化(重载) ● 我喜欢「型」: polymorphism多型 genericity 泛型 ● 我喜欢「程」: process 行程/进程(大陆用语) thread 绪程/线程(大陆用语) programming 编程 ...
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...