小白求教：下滑線的部分顯示有誤 請問為什么？
package com.project5;
public class Circle extends Shape {
?@Override
?public void C(double r){
??// TODO Auto-generated method stub
??double cc=3.14;
??double CC=2*cc*r;
??System.out.println("C"+CC);
??
?}
?@Override
?public void S(double r) {
??// TODO Auto-generated method stub
??double cc=3.14;
??double SS=cc*r*r;
??System.out.println("S"+SS);
?}
}
2017-08-20
你的shape 里邊是不是有抽象方法，沒有在circle類中實現？
2017-08-21
package?com.project5; public?abstract?class?Shape?{ ?public?abstract?void?C(double?x,double?y); ?public?abstract?void?C(double?r); ?public?abstract?void?S(double?x,double?y); ?public?abstract?void?S(double?r); } 是這樣的