定义一个图形类及其子类（三角形类和矩形类），分别计算其面积和周长。

//定义一个图形类及其子类（三角形类和矩形类），分别计算其面积和周长。
class Graphical {//父类
public
double width;//成员变量
public
double length;
public
double area;
public
double Perimeter;

public
double areaGraphical() {//成员方法
return
area;

}

public
double PerimeterGraphical() {
return
Perimeter;

}
}

class rectangle extends Graphical {//子类继承父类

public
double areaGraphical() {
area
= width * length;
return
area;
}

public
double PerimeterGraphical() {
Perimeter
= (width + length) * 2;
return
Perimeter;

}
}

class Triangle extends Graphical {//子类继承父类
public
double high;
public
double bottom;
public
double side;

public
double areaGraphical() {
area
= (bottom * high) / 2;
return
area;
}

public
double PerimeterGraphical() {
Perimeter
= high + bottom + side;
return
Perimeter;

}

}

public class jicheng {//主类

public
static void main(String[] args) {
rectangle
p1 = new rectangle();// 声明对象和创建对象
p1.width
= 3;
p1.length
= 4;
p1.areaGraphical();
p1.PerimeterGraphical();
System.out.println("矩形面积:"
+ p1.areaGraphical() + "矩形周长:" + p1.PerimeterGraphical());//输出
Triangle
p2 = new Triangle();// 声明对象和创建对象
p2.high
= 3;
p2.side
= 5;
p2.bottom
= 4;
p2.areaGraphical();
p2.PerimeterGraphical();
System.out.println("三角形面积:"
+ p2.areaGraphical() + "三角形周长:" + p2.PerimeterGraphical());//输出
//
TODO 自动生成的方法存根

}

}