java - 错误调用方法

Question

我正在做一项类作业，要求抛硬币并记录它正面朝上或反面朝上的次数。我很确定其中大部分是正确的，但让我失望的部分是调用方法“coinFlip”。当我尝试在计数器类中调用它时，我收到错误消息“coinFlip 无法解析为类型”我似乎无法弄清楚如何修复它，或者理解为什么我会收到该消息.感谢任何帮助，提前致谢。

package coinProject;

public class GenericCoin {

    public class coinFlip{
        private int heads = 0;
        private int sideUp; //used to record which side the coin lands on

        public coinFlip(){
            flip();
        }

        public void flip(){
            sideUp = (int) (Math.random() * 2);//used to keep random number under 2
        }

        public boolean headFlip(){
            return (sideUp == heads);
        }

        public String toString(){//limits to only two print options, heads or tails
            return (sideUp == heads) ? "Heads" : "Tails";
        }
    }

}

============================================= =================================

package coinProject;



public class counter {

    public static void main(String[] args){

        final int flip = 50;
        int headFlips = 0 , tailFlips = 0;

        coinFlip coin = new coinFlip();


        for(int i = 1; i <= flip; i++){
            coin.flip();

            if(coin.headFlip()){
                headFlips ++;
            }
            else{
                tailFlips ++;
            }

            System.out.println(coin.toString());
        }

        System.out.println();//creates gaps after flips
        System.out.println();

        System.out.println("----- Flipped: " + flip);
        System.out.println("----- Heads: " + headFlips);
        System.out.println("----- Tails: " + tailFlips);


    }

}

Answer 1

您已将 coinFlip 定义为内部类，因此在实例化 `coinFlip' 之前需要一个 GenericCoin 的实例。所以你需要:

GenericCoin.coinFlip coin = new GenericCoin().new coinFlip();