使用嵌套的FOR循环从2D数组打印整数

Question

我在AI项目的一部分Java代码中遇到了一些问题。 该程序应该采用代表迷宫的11x13 2d数组。 我们给的印刷迷宫为每个单元格使用字符，但是为了易于使用，我使用助记码将其转换为整数。

我的问题是，当我尝试将2d整数数组打印到屏幕上以检查传送是否正常时，即使我有一个检查函数也能逐个检查该数组，以检查错误，即使每个单元格都为零，价值观。

该项目目前由2个文件组成。 主文件-函数（AISemesterProject.java）和将来将实现UCS算法的文件（UCS.java）

AISemesterProject.java

package aisemesterproject;

public class AISemesterProject
{
    public static void main(String[] args)
    {
        UCS a = new UCS();

        a.checkArrayInt();
        a.printInt();
    }
}

UCS.java

package aisemesterproject;

import java.util.Arrays;

public class UCS
{
    int row = 11;
    int col = 13;
    int[][] array_int = new int[row][col];

    public UCS()
    {
        // Lets assume
        // x = 0
        // e = 1
        // d = 2
        // s = 8
        // g = 9
        int[][] array_int = new int[][] {
            {0,1,0,1,1,1,1,0,0,1,0,9,0},
            {1,1,1,2,0,1,1,0,0,1,2,1,0},
            {0,1,0,1,1,1,1,0,0,1,0,0,0},
            {8,1,2,0,1,2,0,1,1,2,1,1,1},
            {0,0,1,1,0,1,1,1,0,0,0,0,0},
            {1,2,1,0,1,0,1,1,0,0,1,1,1},
            {0,1,2,0,1,0,0,2,1,1,2,1,9},
            {1,0,1,1,2,1,1,1,0,1,1,1,1},
            {1,1,2,1,1,0,0,1,0,0,0,0,0},
            {0,0,1,1,1,0,0,1,1,1,1,1,2},
            {0,0,1,0,0,1,1,1,0,9,0,1,1}
        };
    }

    public void checkArrayInt()
    {
        int i = 0, j = 0;
        boolean checker = false;

        for(i = 0; i < row; i++)
        {
            for(j = 0; j < col; j++)
            {
                if(!(array_int[i][i] == 0 || array_int[i][j] == 1 || array_int[i][j] == 2 || array_int[i][j] == 8 || array_int[i][j] == 9))
                {
                    checker = true;
                    System.out.print("Error at Row:" + i + " Column:" + j + "\n");
                }
            }
        }

        if(checker == false)
        {
            System.out.print("Array OK... \n");
        }
    }

    public void printInt()
    {
        int i = 0, j = 0;

        //System.out.println(Arrays.deepToString(array_int));

        for(i = 0; i < row; i++)
        {
            System.out.print("Row " + (i + 1) + ":");

            for(j = 0; j < col; j++)
            {
                System.out.print(" " + String.valueOf(array_int[i][j]));
                //System.out.print(" " + Integer.toString(array_int[i][j]));
                //System.out.printf(" %d", array_int[i][j]);
                //System.out.print(" " + array_int[i][j]);
            }

            System.out.print("\n");
        }
    }
}

输出量

如您所见，输出不是我所期望的，并且我尝试了4种不同的打印方法（有效1种，注释3条），但是结果始终相同。

有人知道我在想什么或做错了什么吗？

谢谢你的时间。

Answer 1

看来您有范围问题...

int[][] array_int = new int[row][col];

public UCS()
{
    // Lets assume
    // x = 0
    // e = 1
    // d = 2
    // s = 8
    // g = 9
     array_int = new int[][] {
        {0,1,0,1,1,1,1,0,0,1,0,9,0},
        {1,1,1,2,0,1,1,0,0,1,2,1,0},
        {0,1,0,1,1,1,1,0,0,1,0,0,0},
        {8,1,2,0,1,2,0,1,1,2,1,1,1},
        {0,0,1,1,0,1,1,1,0,0,0,0,0},
        {1,2,1,0,1,0,1,1,0,0,1,1,1},
        {0,1,2,0,1,0,0,2,1,1,2,1,9},
        {1,0,1,1,2,1,1,1,0,1,1,1,1},
        {1,1,2,1,1,0,0,1,0,0,0,0,0},
        {0,0,1,1,1,0,0,1,1,1,1,1,2},
        {0,0,1,0,0,1,1,1,0,9,0,1,1}
    };

您已经将数组创建为类级变量

Answer 2

您的构造函数正在设置局部变量 array_int 。 此局部变量使具有相同名称的字段蒙上阴影，因此它永远不会看到您为其分配的数组。

您应该确保要分配给该字段，最简单的方法是从构造函数中删除int[][]字。

Answer 3

谢谢大家。 在开始时，我将declatarion从构造函数移到了变量，并且它起作用了。

package aisemesterproject;

import java.util.Arrays;

public class UCS
{
    int row = 11;
    int col = 13;

    // Lets assume
    // x = 0
    // e = 1
    // d = 2
    // s = 8
    // g = 9

    int[][] array_int = new int[][] {
        {0,1,0,1,1,1,1,0,0,1,0,9,0},
        {1,1,1,2,0,1,1,0,0,1,2,1,0},
        {0,1,0,1,1,1,1,0,0,1,0,0,0},
        {8,1,2,0,1,2,0,1,1,2,1,1,1},
        {0,0,1,1,0,1,1,1,0,0,0,0,0},
        {1,2,1,0,1,0,1,1,0,0,1,1,1},
        {0,1,2,0,1,0,0,2,1,1,2,1,9},
        {1,0,1,1,2,1,1,1,0,1,1,1,1},
        {1,1,2,1,1,0,0,1,0,0,0,0,0},
        {0,0,1,1,1,0,0,1,1,1,1,1,2},
        {0,0,1,0,0,1,1,1,0,9,0,1,1}
    };

    public UCS()
    {
        // Lets assume
        // x = 0
        // e = 1
        // d = 2
        // s = 8
        // g = 9

        // Array initialization outside the constructor scope
    }

    public void checkArrayInt()
    {
        int i = 0, j = 0;
        boolean checker = false;

        for(i = 0; i < row; i++)
        {
            for(j = 0; j < col; j++)
            {
                if(array_int[i][j] == 0) //Check for 0 = x
                {
                    checker = false;
                }
                else if(array_int[i][j] == 1) //Check for 1 = e
                {
                    checker = false;
                }
                else if(array_int[i][j] == 2) //Check for 2 = d
                {
                    checker = false;
                }
                else if(array_int[i][j] == 8) //Check for 8 = s
                {
                    checker = false;
                }
                else if(array_int[i][j] == 9) //Check for 9 = g
                {
                    checker = false;
                }
                else //All other integers, which are false
                {
                    checker = true;
                    System.out.print("Error at Row:" + i + " Column:" + j + "\n");
                }
           }
        }

        if(checker == false)
        {
            System.out.print("Array OK... \n");
        }
   }

    public void printInt()
    {
        int i = 0, j = 0;

        //System.out.println(Arrays.deepToString(array_int));

        for(i = 0; i < row; i++)
        {
             System.out.print("Row " + (i + 1) + ":");

            for(j = 0; j < col; j++)
            {
                System.out.print(" " + String.valueOf(array_int[i][j]));
                //System.out.print(" " + Integer.toString(array_int[i][j]));
                //System.out.printf(" %d", array_int[i][j]);
                //System.out.print(" " + array_int[i][j]);
            }

            System.out.print("\n");
        }
    }
}