父類
package?imooc02;
public?abstract?class?Shape?{
????public?abstract?void?Perimeter();
????public?abstract?void?Area();
}
子類01
package?imooc02;
public?class?Rectangle?extends?Shape?{
????@Override
????public?void?Perimeter()?{
????????//?TODO?Auto-generated?method?stub
????????double?a;
????????double?b;
????????double?c;
????????double?c=?(a+b)*(a+b);
????????System.out.println("長方形的周長為"+c);
????????}
????
????@Override
????public?void?Area(){
????????//?TODO?Auto-generated?method?stub
????????????double?a?;
????????????double?b;
????????????double?s;
????????double?s=?a*b;
????????System.out.println("長方形的的面積為"+s);
????}
}
子類02
package?imooc02;
public?class?Circle?extends?Shape?{
????@Override
????public?void?Perimeter(){
????????//?TODO?Auto-generated?method?stub
????????double?π;
????????double?d;
????????private?double?c?;
????????private?double?c=?π*d;
????????System.out.println("圓的周長是："+c);
????????
????}
????@Override
????public?void?Area(){
????????//?TODO?Auto-generated?method?stub
????????double?π;
????????double??d;
????????double?s;
????????double?s=?π*((d/2)*(d/2));
????????System.out.println("圓的面積是:"+s);
????}
}?????
測試類
package?imooc02;
public?class?Test?{
????public?static?void?main(String[]?args)?{
????????Shape?a1=new?Rectangle();
????????a1.Perimeter();
????????a1.Area();
????????Shape?a2=new?Circle();
????????a2.Perimeter();
????????a2.Area();
????}
}
3 回答
ART原藝美學
TA貢獻1條經(jīng)驗 獲得超0個贊
這回對了嗎？
父類
package?imooc02;
public?abstract?class?Shape?{
????public?abstract?void?Perimeter();
????public?abstract?void?Area();
}
子類
package?imooc02;
public?class?Rectangle?extends?Shape?{
????@Override
????public?void?Perimeter()?{
????????//?TODO?Auto-generated?method?stub
????????double?a=10.0;
????????double?b=10.0;
????????double?c;
?????????c=?(a+b)*2;
????????System.out.println("長方形的周長為"+c);
????????}
????
????@Override
????public?void?Area(){
????????//?TODO?Auto-generated?method?stub
????????????double?a=10.0?;
????????????
????????????double?b=10.0;
????????????
????????????double?s;
?????????s=?a*b;
????????System.out.println("長方形的的面積為"+s);
????}
}
子類02
package?imooc02;
public?class?Circle?extends?Shape?{
????@Override
????public?void?Perimeter(){
????????//?TODO?Auto-generated?method?stub
????????final?double?PI=3.14;
????????double?d=9.0;
?????????double?c?;
???????????c=?PI*d;
????????System.out.println("圓的周長是："+c);
????????
????}
????@Override
????public?void?Area(){
????????//?TODO?Auto-generated?method?stub
????????final?double?PI=3.14;;
?????????double??d=9.0;
????????double?s;
?????????s=?PI*(d/2);
????????System.out.println("圓的面積是:"+s);
????}
}?????
測試類
package?imooc02;
public?class?Test?{
????public?static?void?main(String[]?args)?{
????????Shape?a1=new?Rectangle();
????????a1.Perimeter();
????????a1.Area();
????????Shape?a2=new?Circle();
????????a2.Perimeter();
????????a2.Area();
????}
}
長方形的周長為40.0
長方形的的面積為100.0
圓的周長是：28.26
圓的面積是:14.13
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