Arraylist，不可比类型：DieClass和int

Question

该程序使用Dieclass类中的方法

import java.util.ArrayList;
public class DieTester
{
private static ArrayList<DieClass> player = new ArrayList<DieClass>();
private static ArrayList<DieClass> computer = new ArrayList<DieClass>();

public static void main(String[] args)
{
    for(int a = 1; a <= 5; a++)
    {
        DieClass roller = new DieClass();
        player.add(roller);
    }
    for(int a = 1; a <= 5; a++)
    {
        DieClass roller = new DieClass();
        computer.add(roller);
    }
    System.out.println("The user rolls: "+player);
    System.out.println("The computer rolls: "+computer);
}

public String findMatching()
{
    int count1 = 0;
    int count2 = 0;
    int count3 = 0;
    int count4 = 0;
    int count5 = 0;

    for(int i=1; i<player.size(); i++)
    {
        if(player.get(i)==1)
        {
            count1++;
        }
        else if(player.get(i)==2)
        {
            count2++;
        }
        else if(player.get(i)==3)
        {
            count3++;
        }
        else if(player.get(i)==4)
        {
            count4++;
        }
        else if(player.get(i)==5)
        {
            count5++;
        }
    }

    for(int i=1; i<player.size(); i++)
    {
        if(computer.get(i)==1)
        {
            count1++;
        }
        else if(computer.get(i)==2)
        {
            count2++;
        }
        else if(computer.get(i)==3)
        {
            count3++;
        }
        else if(computer.get(i)==4)
        {
            count4++;
        }
        else if(computer.get(i)==5)
        {
            count5++;
        }
    }
}

}

Answer 1

您的问题是您正在将DieClass与整数进行比较

 if(player.get(i)==1)

对于计数器，为什么不使用int数组呢？像

int counters [] = new int[6]; 

counters[2]++;

请发布DieClass，然而，我认为，您的代码应该是这样的。

for (DieClass dieClass : player) {          
counters[dieClass.getNumber()-1]++; //Supose that DieClass has a getNumber method and set minus one because counters goes from 0 to 5
}