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public?interface?planeGraphics2

{

public?abstract?double?area();

public?abstract?double?perimeter();

public?abstract?void?print();

}

public?class?rectangle2?implements?planeGraphics2

{

protected?double?length;

protected?double?width;

public?rectangle2(double?length,double?width)

{?this.length=length;

this.width=width;

}

public?rectangle2(double?width)

{

this.length=width;

this.width=width;

}

public?rectangle2(0

{

this(0,0);

}

public?rectangle2(rectangle2?r1)

{?this(r1.length,r1.width);

}

public?double?area()

{

return?this.width*this.length;

}

public?double?perimeter()

{

return(this.width+this.length)*2;

}

public?void?print()

{

if?(this.length==this.width)

system.out.println("一個矩形。邊長為"+this.length);

else

system.out.print("一個長方形，長度為"+this.length+",寬度"+this.width);

system.out.println(",面積為"+this.area()+",周長為"+this.perimeter());

}

public?static?void?main(string?args[])

{

rectangle2?r1=?new?rectangle2(10,20);

r1.print();

r1=new?rectangle2(10);

r1.print();

}

}

總結

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