Java 如何使用我创建的方法修改数组中对象的一个属性？

我正在尝试使用我创建的ModifyPhonePrices修改我手机类中对象的价格，但无论何时调用该方法，该方法都不起作用。请帮助

import java.util.Random;
public class ModifyCellPhones {

    public static double ModifyPhonePrices (double[][] cellarr, double ov, double nv)
    {
        int ctr=0, i, j;

        for (i=0; i < cellarr[i].length ; i++)
        {
            for (j=0; j < cellarr[j].length; j++)
            {
            if (cellarr[i][j] == ov)//if the content of the index i in the array 
            {                   //equals that of the old value then     
                cellarr[i][j] = nv;//it will be replaced by the new value
                ctr++;//keeps track of the changes performed
                System.out.println("The value changed was found at index" + "[" + i + "]" + "[" + j + "]");
            }
            }
        }
        return ctr;
    }

    public static void main(String[] args) {
        // TODO Auto-generated method stub

        int i, j, counter = 0;
        Random rand = new Random();//random object that will assign random values to the phones that are uninitialized

        CellPhone [][] cp = new CellPhone [10][10];//creation of two-dimensional array

        //creating 90 cellphones using the for loop

                for (i=0 ;i < 10; i++)
                {
                    for (j=0; j < 10; j++)
                    {
                    cp[i][j] = new CellPhone ("Blackberry",569874132,300.00);
                    counter++;
                    System.out.println(cp[i][j]);
                    }
                }


         System.out.println();
         System.out.println("Here are the contents of the array; only the prices of the contents are shown:");
         System.out.println();

        //setting the prices using the random class
        for (i=0; i < 10; i++)
        {
            for (j=0; j < 10; j++)
            {
                 cp[i][j].setprice(rand.nextInt(300));
                 System.out.printf("%8.2f",cp[i][j].getprice());
            }
        System.out.println();
        }

        //creating a another array to copy the price content of the cellphone array

        double [][] arr = new double [10][10];
                for (i=0; i<10; i++)
                {
                    for (j=0; j<10; j++)
                    {
                        arr[i][j] = cp[i][j].getprice();
                    }
                }

        //modifying values using the ModifyPhonePrices method created

        counter = ModifyCellPhones.ModifyPhonePrices(arr[][] ,150.00,200.00);

        if  (counter > 0)
        {
            System.out.println (counter + "changes are made.");
        }       
    }
}

import java.util.Random；
公营改装手机{
公共静态双修改电话价格（双[][]Celler、双ov、双nv）
{
int ctr=0，i，j；
对于（i=0；i
for (i=0; i < cellarr[i].length ; i++)
{
    for (j=0; j < cellarr[j].length; j++)

（i=0；i
{
对于（j=0；j

应该是

for (i=0; i < cellarr.length; i++)
{
    for (j=0; j < cellarr[i].length; j++)

for（i=0；i

我认为正在发生的事情（尽管您没有指定）是当

j

到达

10

时，

Cell[j]

抛出一个

ArrayIndexOutOfBoundsException

您永远不应该说“它不工作”。您应该始终说出发生了什么，并包括确切的错误消息和所需的行为。

您的问题的一部分（正如所指出的）是您在循环中使用了错误的哨兵值：

for (i=0; i < cellarr[i].length ; i++) {
    for (j=0; j < cellarr[j].length; j++) {

而不是

counter = ModifyPhonePrices(arr[][], 150.00, 200.00);

---

最后，对于货币来说，

double

是个坏主意。看看

这些更改应该会产生工作代码

counter = ModifyPhonePrices(arr, 150.00, 200.00);

counter = ModifyPhonePrices(arr[][], 150.00, 200.00);