public?abstract?class?TuAn?{

	abstract?void?zhouchang();

	abstract?void?mianji();
}

這是抽象類；

public?class?FangXing?extends?TuAn?{

	public?int?a;
	public?int?b;

	public?void?setA(int?a)?{
		this.a?=?a;
		System.out.println("a="?+?a);
	}

	public?void?setB(int?b)?{
		this.b?=?b;
		System.out.println("b="?+?b);
	}

	@Override
	void?zhouchang()?{
		//?TODO?Auto-generated?method?stub
		
		System.out.println("a="?+?a);
		System.out.println("b="?+?b);
		System.out.println((2?*?(a?+?b)));
	}

	@Override
	void?mianji()?{
		//?TODO?Auto-generated?method?stub
		System.out.println(a?*?b);

	}

}

這是方形。。；

public?class?YuanXing?extends?TuAn?{

	int?r;

	void?zhouchang()?{
		//?TODO?Auto-generated?method?stub
		System.out.println(2?*?3.14?*?r);
	}

	@Override
	void?mianji()?{
		//?TODO?Auto-generated?method?stub
		System.out.println(3.14?*?r?*?r);
	}

	public?void?setR(int?r)?{
		this.r?=?r;
	}

}

這是圓形；

import?java.util.Scanner;

public?class?Initial1?{

	public?static?void?main(String[]?args)?{
		//?TODO?Auto-generated?method?stub
		TuAn?tuan1?=?new?FangXing();
		TuAn?tuan2?=?new?YuanXing();
		Scanner?scr?=?new?Scanner(System.in);
		FangXing?a?=?new?FangXing();
		YuanXing?b?=?new?YuanXing();
		a.setA(scr.nextInt());
		a.setB(scr.nextInt());
		tuan1.zhouchang();
		tuan1.mianji();
		b.setR(scr.nextInt());
		tuan2.zhouchang();
		tuan2.mianji();
		scr.close();

	}

}

這是測試類 ；

問題是運行的時候參數讀不進去啊。。。求指點；