interfacedemo3.java

来自「《Java语言程序设计》源代码 很好的JAVA入门的好的代码」· Java 代码 · 共 37 行

interface shape{
double PI=3.14159;
double area();
double volume();
}
interface color{
      void setcolor(String str); 
}
class Circle implements shape,color{
double radius;
String color;
public Circle(double r){
	  radius=r;
}
public double area(){
	   return PI*radius*radius;
}
public double volume(){
	   return 4*PI*radius*radius*radius/3;
}
public void setcolor(String str){
	   color=str;
}
String getcolor(){
	 return color;
}
}
public class InterfaceDemo3{
public static void main(String args[]){
Circle cir=new Circle(15);
System.out.println("Circle area="+cir.area());
System.out.println("Circle vloume="+cir.volume());
cir.setcolor("Red");
System.out.println("Circle colore="+cir.getcolor());
}
}