Java - 打印二维数组 [英] Java - printing two dimensional array

问题描述

我有一个[20] [20]二维数组，我操纵过。简而言之，我正在做一个乌龟项目，用户输入指令，如笔向上= 0和笔向下= 1.当笔向下时，单个阵列位置，例如[3] [4]标记为1 。

I have a [20][20] two dimensional array that I've manipulated. In a few words I am doing a turtle project with user inputting instructions like pen up = 0 and pen down = 1. When the pen is down the individual array location, for instance [3][4] is marked with a "1".

我的程序的最后一步是打印出20/20数组。

The last step of my program is to print out the 20/20 array.

我可以'弄清楚如何打印它我需要用X替换1

I can't figure out how to print it and I need to replace the "1" with an "X"

打印命令实际上是父类程序中类的一个方法会打电话......我知道我必须使用循环......任何帮助都会受到赞赏。

The print command is actually a method inside a class that a parent program will call...I know I have to use a loop...any help would be appreciated.

public void printGrid()
        {
            System.out.println...
        }

推荐答案

public void printGrid()
{
   for(int i = 0; i < 20; i++)
   {
      for(int j = 0; j < 20; j++)
      {
         System.out.printf("%5d ", a[i][j]);
      }
      System.out.println();
   }
}

并替换

public void replaceGrid()
{
   for (int i = 0; i < 20; i++)
   {
      for (int j = 0; j < 20; j++)
      {
         if (a[i][j] == 1)
            a[i][j] = x;
      }
   }
}

你可以做到这一切一气呵成：

And you can do this all in one go:

public void printAndReplaceGrid()
{
   for(int i = 0; i < 20; i++)
   {
      for(int j = 0; j < 20; j++)
      {
         if (a[i][j] == 1)
            a[i][j] = x;
         System.out.printf("%5d ", a[i][j]);
      }
      System.out.println();
   }
}

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