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(zhǎng)方形的周長(zhǎng)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(zhǎng)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(zhǎng)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(cè)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();
????}
}
路過看看我的4-3 抽象類課后作業(yè)求解？？？
ART原藝美學(xué)
2017-03-08 16:53:50
