Question

Java试题

现有接口定义如下

interface shape2D {

double pi=3.14;

double area(); }

请编写类 Circle 和类 Rectangle ，实现上述接口，用于计算圆和矩形的面积

Answer 1

public interface shape2D {
double pi=3.14;
double area();
}
-------------------------
public class Circle implements shape2D{

public double area() {
double r = 5;
double area = pi*r*r;
return area;
}
}
---------------------------
public class Rectangle implements shape2D{

public double area() {
double w = 4;
double h = 6;
double area = w*h;
return area;
}
}
-------------------------------
public class Test {

public static void main(String[] args) {
Circle circle = new Circle();
Rectangle rectangle = new Rectangle();
System.out.println(circle.area());
System.out.println(rectangle.area());
}
}

Answer 2

哥们找本java的教材好好学习下吧，这个就是一个类的实现，没有别的难得东西。