问题描述：
定义一个抽象类型shape,定义类名circular圆形，定义半径，构造函数，计算机面积公式以及周长，正方形也是一样，用c2.print()调用方法输出结果
package S3;
public class S1 {
public static void main(String[] args) {
circular c1 =new circular(4);//传递实参
c1.print();
Square c2 = new Square(5);
c2.print();//调用方法
}
}
abstract class Shape
{
abstract double getArea();
abstract double getperimeter();
}
class circular extends Shape //圆形
{
double rear;
public circular(double r)//构造函数
{
rear=r;
}
public double getArea() //面积
{
return 3.14*rear*rear;
}
public double getperimeter() //周长
{
return 2*3.14*rear;
}
public void print()//输出圆形的面积和周长
{
System.out.println("面积是："+getArea());
System.out.println("周长是："+getperimeter());
}
}
class Square extends Shape //正方形
{
double leght;
public Square(double l)
{
leght=l;
}
public double getArea() //面积
{
return leght*leght;
}
public double getperimeter() //周长
{
return 2*(leght+leght);
}
public void print()
{
System.out.println("面积是："+getArea());
System.out.println("周长是："+getperimeter());
}
}
问题描述：
建设银行ConstructionBank是Bank的子类准备覆盖继承的成员变量year,并覆写计算利息的方法，同样构造函数，传递参数，计算利息，调用方法。
package S3;
public class S2 {
public static void main(String[] args) {
// TODO Auto-generated method stub
Bank C1 =new ConstructionBank();
C1.dispoit(10000.75, 8);
//C1.computerInterest();
System.out.println(C1.computerInterest());
}
}
class Bank{
int year;//年份
double interest;//利息
double saveMoney;//保存货币
void dispoit(double money,int year) {
saveMoney=money;
this.year=year;
}
double computerInterest(){
interest=year*0.35*saveMoney;
return interest;
}
}
class ConstructionBank extends Bank{
double year;
double price;
double computerInterest()
{
price=(year-(int)year)*0.0001*saveMoney+super.computerInterest();
return price;
}
}
