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數3退1(面向物件思想)

{
        KidCircle kc 
=new KidCircle(500);
        
int countNum =0;
        Kid k 
= kc.first;
        
while(kc.count >1{
            countNum
++;
            
if(countNum ==3{
                countNum 
=0;
                kc.delete(k);
            }

            k 
= k.right;
        }

        
        System.out.println(kc.first.id);
    }