朵朵456
春芽
共回答了19个问题采纳率:94.7% 举报
public interface Circle {
double area(double r);
}
public class CircleImpl implements Circle {
public double area(double r) {
return r*r*3.14;
}
}
public class Test {
public static void main(String[] args) {
Circle c = new CircleImpl();
System.out.println(c.area(1.3));
}
}
1年前
10