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/*

*?--測試類?(4)Test類作為主類要完成測試功能?①?生成Rectangle對象?②?調用對62616964757a686964616fe4b893e5b19e31333335346137象的toString方法，輸出對象的描述信息

*/

public?class?Test?{

public?static?void?main(String?args[])?{

Rectangel?rectangel?=?new?Rectangel(1,2);

System.out.println(rectangel);

Triangle?triangle?=?new?Triangle(3,4,5);

System.out.println(triangle);

Circle?circle?=?new?Circle(1);

System.out.println(circle);

}

}

/*

*?--父類?(1)父類Shape：?name:String類型，形狀的名稱?color:String類型，形狀的顏色

*/

class?Shape?{

private?String?name;

private?String?color;

}

/*

*?--接口?(2)IshapeCaculate?double?getArea()：求一個形狀的面積?double?getPerimeter

*?()：求一個形狀的周長

*/

interface?IshapeCaculate?{

public?double?getArea();

public?double?getPerimeter();

}

/*

*?--子類?(3.1)類?Rectangel：?實現接口IshapeCaculate，并有以下屬性和方法：?①?屬性?width：

*?double類型，表示矩形的長?height：?double類型，表示矩形的高?②?方法?Rectangle(double?w,?double

*?h)：構造函數?toString()方法?：輸出矩形的描述信息，如“矩形?width=1.0,height=2.0,?perimeter=6.0,

*?area=2.0”

*/

class?Rectangel?extends?Shape?implements?IshapeCaculate?{

private?double?width;

private?double?height;

public?Rectangel(double?w,?double?h)?{

this.width?=?w;

this.height?=?h;

}

@Override

public?double?getArea()?{

return?width?*?height;

}

@Override

public?double?getPerimeter()?{

return?2?*?(width?+?height);

}

public?String?toString()?{

return?"矩形?width="?+?width?+?",height="?+?height?+?",?perimeter="?+?getPerimeter()?+?",area="?+?getArea();

}

}

/*

*?(3.2)類Triangle：?實現接口IshapeCaculate，并有以下屬性和方法：?①?屬性?x,y,z:double型，表示三角形的三條邊?s:

*?周長的1/2(注：求三角形面積公式為sqrt(s(s-x)(s-y)(s-z))?，s=(x+y+z)/2

*?，開方可用Math.sqrt(double)方法)?②?方法?Triangle(double?x,?double?y,?double

*?z)：構造函數，給三條邊和s賦初值。?toString()：輸出矩形的描述信息，如“三角形?three

*?sides:3.0,4.0,5.0,perimeter=12.0,area=6.0”?--測試類?(4)Test類作為主類要完成測試功能?①

*?生成Rectangle對象?②?調用對象的toString方法，輸出對象的描述信息

*

*/

class?Triangle?extends?Shape?implements?IshapeCaculate?{

private?double?x;

private?double?y;

private?double?z;

private?double?s;

public?Triangle(double?x,?double?y,?double?z)?{

this.x?=?x;

this.y?=?y;

this.z?=?z;

s?=?getPerimeter()?/?2;

}

@Override

public?double?getArea()?{

return?Math.sqrt(s?*?(s?-?x)?*?(s?-?y)?*?(s?-?z));

}

@Override

public?double?getPerimeter()?{

return?x?+?y?+?z;

}

public?String?toString()?{

return?"三角形?three?sides:"?+?x?+?","?+?y?+?","?+?z?+?",perimeter="?+?getPerimeter()?+?",area="?+?getArea();

}

}

/*

*?(3.3)類Circle實現接口IshapeCaculate，并有以下屬性和方法：?①?屬性?radius：?double類型，圓的半徑?②?方法

*?Circle(double?radius)：構造函數?toString()方法?：輸出矩形的描述信息，如“圓形?radius=1.0,

*?perimeter=6.28,?area=3.14”

*/

class?Circle?extends?Shape?implements?IshapeCaculate?{

private?double?radius;

public?Circle(double?radius)?{

this.radius?=?radius;

}

@Override

public?double?getArea()?{

return?Math.PI?*?Math.pow(radius,?2);//圓周率*半徑的平方

}

@Override

public?double?getPerimeter()?{

return?2?*?3.1415926?*?radius;

}

public?String?toString()?{

return?"圓形?radius="?+?radius?+?",perimeter="?+?getPerimeter()?+?",?area="?+?getArea();

}

}

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