Question

自定义抽象平面图形类，内含抽象的面积和周长计算方法。定义继承抽象图形类的圆类

Answer 1

public abstract class Shape {

public abstract double getCircumference ();

public abstract double getSquare();
}

public class Circle extends Shape {

public double radius;
@Override
public double getCircumference() {
// TODO Auto-generated method stub

return 3.14 * 2 * radius;
}

@Override
public double getSquare() {
// TODO Auto-generated method stub
return 3.14 * radius * radius;
}

}

Answer 2

楼上已经讲得很清楚了，你多看看书就行了啊，我看你是很多定义性的，固定的格式都不是很清楚吧