来来来交作业
package homework;
public abstract class shape {
public abstract void perimeter();
public abstract void area();
}public class Rectangle extends shape {
int h = 5;
int w = 3;
public void perimeter() {
System.out.println("矩形周长为:"+2*(h+w));
}
@Override
public void area() {
System.out.println("矩形面积为:"+(h*w));
}
}
public class Circle extends shape {
float r = 3.2f;
float π = 3.14f;
@Override
public void perimeter() {
System.out.println("圆周长为:"+2*π*r);
}
@Override
public void area() {
System.out.println("圆面积为:"+r*π*r);
}
}
public class test {
public static void main(String[] args) {
Rectangle re = new Rectangle();
re.perimeter();
re.area();
Circle ci = new Circle();
ci.area();
ci.perimeter();
}
}
