code. compile. run. debug. share.
class Circle
{
// aggregation
Square_operation s;
double PI = 3.14;
double area(int radius)
{
s = new Square_operation();
int r_sq = s.square(radius);
return PI*r_sq;
}
}
class Square_operation
{
int square(int r)
{
return r*r;
}
}
public class Main
{
public static void main(String args[])
{
Circle c = new Circle();
System.out.println(c.area(10));
}
}
Compiling Program...
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