package?com.imooc.test2;

public?class?Tectangle?extends?Shape?{
	double?length;
	double?width;
	public?Tectangle(double?length,double?width){
		this.length=length;
		this.width=width;
	}
	@Override
	public?double?perimeter()?{
		double?perimeter=this.length*2+this.width*2;
		return?perimeter;
	}

	@Override
	public?double?area()?{
		double?area=this.length*this.width;
		return?area;
	}

}

//這是我自己建的tectangle類(lèi)??

package?com.imooc.test2;

public?abstract?class?Shape?{
	public?abstract?double?perimeter();
	public?abstract?double?area();?
}

//這是shape類(lèi)

eclipse一直在提示我在tectangle里創(chuàng)建的兩個(gè)方法必須覆蓋或?qū)崿F(xiàn)超類(lèi)型方法
這是為啥呢
虛心求教?望各位解惑??在此謝過(guò)