共回答了29个问题采纳率：96.6%

接口PlaneGraphics：public interface PlaneGraphics

{

public double area();

public double perimeter();

public String print();

}类Ractangle：

public class Ractangle implements PlaneGraphics

{

public double a;

public double b;

@Override

public double area()

{

// TODO Auto-generated method stub

return a * b;

}

@Override

public double perimeter()

{

// TODO Auto-generated method stub

return 2 * (a + b);

}

@Override

public String print()

{

// TODO Auto-generated method stub

return "类型：长方形；属性：长" + a + ",宽" + b + "；面积：" + area() + "；周长："

+ perimeter();

}

}类Ellipse：public class Ellipse implements PlaneGraphics

{

public double a;

public double b;

@Override

public double area()

{

// TODO Auto-generated method stub

return Math.PI * a * b;

}

@Override

public double perimeter()

{

// TODO Auto-generated method stub

return 0;

}

@Override

public String print()

{

// TODO Auto-generated method stub

return "类型：椭圆；属性：a轴" + a + ",b轴" + b + "；面积：" + area() + "；周长："

+ perimeter();

}

}正方形类：public class Square extends Ractangle

{

public int a;

@Override

public double area()

{

// TODO Auto-generated method stub

return a * a;

}

@Override

public double perimeter()

{

// TODO Auto-generated method stub

return 4 * a;

}

@Override

public String print()

{

// TODO Auto-generated method stub

return "类型：正方形；属性：边长" + a + "；面积：" + area() + "；周长：" + perimeter();

}

}圆形类：

public class Round extends Ellipse

{

public int r;

@Override

public double area()

{

// TODO Auto-generated method stub

return Math.PI * r * r;

}

@Override

public double perimeter()

{

// TODO Auto-generated method stub

return 2 * Math.PI * r;

}

@Override

public String print()

{

// TODO Auto-generated method stub

return "类型：圆；属性：半径" + a + "；面积：" + area() + "；周长：" + perimeter();

}

}

1年前

10