我有一个形状和方块类:
public class Shape {..}
public class Square extends Shape {...}
我有一个父类和子类，它们有处理形状/正方形方法:
public class Parent(){
public void doSomething(Shape a){
print("Parent doSomething called");
}
}
public class Child extends Parent(){
@Override
public doSomething(Shape a){
print("Child doSomething for SHAPE called");
}
public doSomething(Square a){
print("Child doSomething for SQUARE called");
}
}
现在，当我执行以下命令时:
Shape square = new Square();
Parent parent = new Child();
parent.doSomething(square);
正如预期的那样，“Child doSomething for SHAPE Call”是输出。
有没有一种方法可以通过纯多态获得“Child doSomething for SQUARE Call”输出，而不在父类中定义doSomething（SQUARE a）并在子类中使用@Override？
不用说，我正试图避免任何IF/ELSE检查与实例的操作符和额外的铸型。
下面工作正常
public class PloyM {
public static void main(String[] args) {
Child c = new Child();
c.doSomething(new Shape());
c.doSomething(new Square());
}
}
class Shape { }
class Square extends Shape {}
class Parent {
public void doSomething(Shape a){
System.out.println("Parent doSomething called");
}
}
class Child extends Parent {
@Override
public void doSomething(Shape a){
System.out.println("Child doSomething for SHAPE called");
}
public void doSomething(Square a){
System.out.println("Child doSomething for SQUARE called");
}
}
