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);
?
????}
?
}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;
????}
?
}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();
?
????}
?
}結果就出現(xiàn)問題了 ，求指導；
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