?? classparameterdemo.java
字號:
class Rectangle{
int width,height;
public Rectangle(int w,int h){
width=w;
height=h;
}
}
class Circle{
double radius;
public Circle(double r){
radius=r;
}
}
public class ClassParameterDemo{
public static void main(String args[]){
ClassParameterDemo cp=new ClassParameterDemo();
Rectangle r=new Rectangle(10,20);
System.out.println("Before:Rectangle width="+r.width+",height="+r.height);
System.out.println("Rectangle area="+cp.area(r));
System.out.println("After:Rectangle width="+r.width+",height="+r.height);
Circle c=new Circle(90);
System.out.println("Before:Circle radius="+c.radius);
System.out.println("Circle area="+cp.area(c));
System.out.println("After:Circle radius="+c.radius);
}
double area(Circle c){
c.radius+=10;
return Math.PI*c.radius*c.radius;
}
double area(Rectangle r){
r.width+=1;
r.height+=1;
return r.width*r.height;
}
}
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