classmemberdemo.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 28 行

class Point{
int x,y;
public Point(int x,int y){
	  this.x=x;
	  this.y=y;
}
}
class Circle{
Point center=new Point(0,0);
double radius;
public Circle(int x,int y,double r){
	   center.x=x;
	   center.y=y;
	   radius=r;
}
public double area(){
	   return Math.PI*radius*radius;	
}
}
public class ClassMemberDemo{
public static void main(String args[]){
	  Circle c1=new Circle(100,100,10);
	  System.out.println("Circle center point:("+c1.center.x+","+c1.center.y+")");
	  System.out.println("Circle radius="+c1.radius);
	  System.out.println("Circle area="+c1.area());
}
}