Question

我正在使用此代码：

import java.util.Scanner;
import java.util.Arrays;
import java.util.Random; 

public class Matrix
{
    public static void main(String[] args)
    {
        Scanner enter = new Scanner(System.in);
        int[][] firstMatrix = new int[4][4];
        int[][] secondMatrix = new int[4][4];
        Random spin = new Random();



        System.out.println("Please enter 16 numbers to populate the array: ");

        for (int count = 0; count<firstMatrix.length;count++) // nested for for user input to populate 4x4 array
        {


            for (int count2 = 0; count2 < firstMatrix[count].length; count2++)
            {

                firstMatrix[count][count2] = enter.nextInt(); // populate array with user input



            }

        } // end array population

            System.out.printf("The sum is: %d%n", sumMatrix(firstMatrix)); // call sumMatrix
            System.out.println(firstMatrix[0][0]); // debug 


            for (int count3 = 0; count3<secondMatrix.length; count3++) // nested for to populate array with random numbers 1-100, row
            {
                for (int count4 = 0; count4<secondMatrix[count3].length; count4++) // column 
                {
                    secondMatrix[count3][count4] = 1 + spin.nextInt(100); // 100 inclusive, generate and populate array
                }
            }

             System.out.println(secondMatrix[0][0]); // debug to show that it is properly printing the correct element

             for (int i = 0; i<secondMatrix.length; i++)
             {
                for (int j = 0; j<secondMatrix[i].length; j++)
                    System.out.print(" " + secondMatrix[i][j]); // print the total array ( this process can be used to print the returned array )


             }

        System.out.println(); // debug

             int arrayTotal = firstMatrix[0][0] + secondMatrix[0][0]; // debug
                System.out.println("The element total is " + arrayTotal); // debug
                    System.out.println();

        addMatrix(firstMatrix,secondMatrix); // call addMatrix






        System.out.println("Programmed by Stephen Mills");
    }  // end main      

        public static int sumMatrix(int[][] array) // method to sum the elements of the array
        {
                int total = 0;

                for (int number = 0; number<array.length; number++) // row 
                {
                    for (int number2 = 0; number2<array[number].length; number2++) // column
                        total += array[number][number2]; // sum of all elements
                }
                    return total; // returns the sum

        } // end sumMatrix

        public static int[][] addMatrix(int[][] array1, int[][] array2) // improper method
        {
            int[][] thirdMatrix = new int[4][4];

            for (int count4 = 0; count4<thirdMatrix.length; count4++)
            {
                for (int count5 = 0; count5<thirdMatrix[count4].length; count5++)
                    thirdMatrix[count4][count5] = array1[count4][count5]+array2[count4][count5];


            }
            System.out.println(Arrays.toString(thirdMatrix));
            return thirdMatrix;
        } // end addMatrix7



}

大多数程序按预期工作，但我得到这个“[I @ 3d4eac69，[I @ 42a57993，[I @ 75b84c92，[I @ 6bc7c054]输出时尝试打印我的数组。我已经尝试了几种方法，包括简单的println，toString，设置一个等于方法调用的变量，我尝试将print语句放在main中，然后放在方法第二位。任何想法为什么会发生这种情况？

Answer 1

如果要打印二维数组thirdMatrix的int元素，可以尝试：

for(int[] simpleArray: thirdMatrix) 
        System.out.println(Arrays.toString(simpleArray));

输出的原因：当你打电话时

Arrays.toString(thirdMatrix)

你会打电话

String.valueOf(element)

第三个矩阵的foreach元素。由于thirdMatrix的元素是Array而不是基本类型，因此方法

String.valueOf(Object obj)

将调用

返回thirdMatrix元素的哈希码（一维数组）。

打印阵列时输出奇怪

1 个答案: