为什么我得到一个varriable未声明的错误？

Question

cannot find symbol - variable minDist即使我知道它已被声明并初始化,我仍然会收到此错误.我觉得它直接盯着我的脸.有谁知道为什么会这样？

还有另一个类文件,但我不认为错误在那里.

我得到它的倒数第三行,当我去minDist,但如果我删除minDist我也得到它minCost,并minMPG为好.

public class AnnualFuelUseTester
{
    public static void main(String[] args)
    {
    int sMiles1, sMiles2, sMiles3, sMiles4;
    int eMiles1, eMiles2, eMiles3, eMiles4;
    int[] dist = new int[4];
    double gals1, gals2, gals3, gals4;
    double[] MPG = new double[4];
    double price1, price2, price3, price4;
    double[] cost = new double[4];

    AnnualFuelUse[] fillUps = {new AnnualFuelUse(108438, 108725, 13.9, 2.98),
                               new AnnualFuelUse(108738, 109023, 15.3, 3.02),
                               new AnnualFuelUse(109023, 109232, 10.3, 3.05),
                               new AnnualFuelUse(109564, 109854, 13.1, 3.03)};

    for(int i = 0; i < fillUps.length; i++)
    {
        dist[i] = fillUps[i].calcDistance();
        MPG[i] = fillUps[i].calcMPG();
        cost[i] = fillUps[i].calcCost();
    }
    for (int i = 0; i < dist.length; i++)
    {
        int maxDist = 0;
        int minDist = dist[0];
        if (dist[i] > maxDist)
        {
            maxDist = dist[i];
        }
        if (dist[i] < minDist)
        {
            minDist = dist[i];
        }
    }
    for (int i = 0; i < dist.length; i++)
    {
        double maxMPG = 0;
        double minMPG = MPG[0];
        if (MPG[i] > maxMPG)
        {
            maxMPG = MPG[i];
        }
        if (MPG[i] < minMPG)
        {
            minMPG = MPG[i];
        }
    }
    for (int i = 0; i < dist.length; i++)
    {
        double maxCost = 0;
        double minCost = cost[0];
        if (cost[i] > maxCost)
        {
            maxCost = cost[i];
        }
        if (cost[i] < minCost)
        {
            minCost = dist[i];
        }
    }

    System.out.printf("%15s%15s%15s%15s%15s%15s%15s%15s%15s\n\n"
                       ,"Fill Up", "Days", "Start Miles", "End Miles"
                       ,"Distance", "Gallons Used", "MPG", "Price", "Cost");
    for(int i = 0; i < fillUps.length; i++)
    {
        System.out.printf("%15s%15s%15s%15s%15s%15s%15.2f%15s%15.2f\n"
                          ,(i+1),(int)(1 + i *(i*1.1)), fillUps[i].getmySMiles()
                          ,fillUps[i].getmyEMiles(), dist[i]
                          ,fillUps[i].getmyGals(), MPG[i]
                          ,fillUps[i].getmyPrice(), cost[i]);
    }
    System.out.printf("%10s%10s%30s%30s","Minimum",minDist,minMPG,minCost);
}                        
}

Answer 1

你minDist在一个for循环中声明,所以它只存在于那里,你不能在循环之外使用它.