package?duotai1;
package?duotai1;

public?class?Parallelogram?extends?Quadrilateral
{
	private?float?Width;
	private?float?Height;
	private?float?Area;
	public?Parallelogram（float?x1?float?y1?float?x2?float?y2?float?x3
			float?y3?float?x4?float?y4）?
	{
		super（x1?y1?x2?y2?x3?y3?x4?y4）;
		System.out.print（“\nCoordinate?of?Parallelogram?are:\n“）;
		System.out.print（“（“+x1+““+y1+“）（“+x2+““+y2+“）（“+x3+““+y3+“）（“+x4+““+y4+“）\n“）;
		Width=x2-x1;
		Height=y4-y1;
		Area=Height*Width;
		
	}
	public?void?show（）
	{
		System.out.print（“Width?is:?“+Width+“\nHeight?is:?“+Height+“\nArea?is:?“+Area+“\n“）;
	}
}

package?duotai1;

public?class?Quadrilateral?
{
	private?float?x1y1;
	private?float?x2y2;
	private?float?x3y3;
	private?float?x4y4;
	public?Quadrilateral（float?x1float?y1float?x2float?y2
			float?x3float?y3float?x4float?y4）
	{
		this.x1=x1;this.y1=y1;
		this.x2=x2;this.y2=y2;
		this.x3=x3;this.y3=y3;
		this.x4=x4;this.y4=y4;
	}
	public?void?show（）
	{
		System.out.print（“Coordinate?of?Quadrilateral?are:\n“）;
		System.out.print（“（“+x1+““+y1+“）（“+x2+““+y2+“）（“+x3+““+y3+“）（“+x4+““+y4+“）\n“）;
	}
}

package?duotai1;

public?class?Rectangle?extends?Quadrilateral
{
	private?float?Width;
	private?float?Height;
	private?float?Area;
	public?Rectangle（float?x1?float?y1?float?x2?float?y2?float?x3
			float?y3?float?x4?float?y4）?
	{
		super（x1?y1?x2?y2?x3?y3?x4?y4）;
		System.out.print（“\nCoordinate?of?Rectangle?are:\n“）;
		System.out.print（“（“+x1+““+y1+“）（“+x2+““+y2+“）（“+x3+““+y3+“）（“+x4+““+y4+“）\n“）;
		Width=x2-x1;
		Height=y4-y1;
		Area=Height*Width;
		
	}
	public?void?show（）
	{
		System.out.print（“Width?is:?“+Width+“\nHeight?is:?“+Height+“\nArea?is:?“+Area+“\n“）;
	}
}