How to print a two dimensional array

Question

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  quot 1 quot   The last step of my program is to print out the 20 20 array  I can t figure out how to print it and I need to replace the  quot 1 quot  with an  quot X quot   The print command is actually a method inside a class that a parent program will call  I know I have to use a loop  public void printGrid         System out println

User · Answer

If you know the maxValue  can be easily done if another iteration of the elements is not an issue  of the matrix  I find the following code more effective and generic       int numDigits    int  Math log10 maxValue    1      if  numDigits  lt   1            numDigits   2            StringBuffer buf   new StringBuffer        for  int i   0  i  lt  matrix length  i              int   row   matrix i           for  int j   0  j  lt  row length  j                  int block   row j               buf append String format       numDigits    d   block                if  j  gt   row length - 1                    buf append   n                                      return buf toString

User · Answer

more simpler approach   use java 5  style for loop Integer     twoDimArray     8  9   8  10            for  Integer   array  twoDimArray               System out print array 0     quot    quot                System out println array 1

User · Answer

Well  since  X  is a char and not an int  you cannot actually replace it in the matrix itself  however  the following code should print an  x  char whenever it comes across a 1   public void printGrid int     in         for int i   0  i  lt  20  i               for int j   0  j  lt  20  j                   if in i  j     1                    System out print  X      t                else                 System out print in i  j      t                      System out print   n

User · Answer

public void printGrid        for int i   0  i  lt  20  i               for int j   0  j  lt  20  j                     System out printf   5d    a i  j                  System out println             And to replace  public void replaceGrid        for  int i   0  i  lt  20  i               for  int j   0  j  lt  20  j                     if  a i  j     1              a i  j    x                   And you can do this all in one go   public void printAndReplaceGrid        for int i   0  i  lt  20  i               for int j   0  j  lt  20  j                     if  a i  j     1              a i  j    x           System out printf   5d    a i  j                  System out println

User · Answer

You should loop by rows and then columns with a structure like  for    row index      for    column index        print   but I guess this is homework so just try it out yourself   Swap the row column index in the for loops depending on if you need to go across first and then down  vs  down first and then across

User · Answer

public static void printTwoDimensionalArray int     a        for  int i   0  i  lt  a length  i              for  int j   0  j  lt  a i  length  j                  System out printf   d    a i  j                      System out println              just for int array

User · Answer

I am also a beginner and I ve just managed to crack this using two nested for loops    I looked at the answers here and tbh they re a bit advanced for me so I thought I d share mine to help all the other newbies out there   P S  It s for a Whack-A-Mole game hence why the array is called  moleGrid    public static void printGrid         for  int i   0  i  lt  moleGrid length  i              for  int j   0  j  lt  moleGrid 0  length  j                  if  j    0    j    moleGrid length - 1     0                    System out print moleGrid i  j                              else                   System out println moleGrid i  j                                        Hope it helps

User · Answer

you can use the Utility mettod  Arrays deeptoString      public static void main String   args        int twoD       new int 4          twoD 0    new int 1        twoD 1    new int 2        twoD 2    new int 3        twoD 3    new int 4         System out println Arrays deepToString twoD

User · Answer

Something like this that i answer in another question  public class Snippet       public static void main String   args            int     lst   new int 10  10            for  int   arr   lst                System out println Arrays toString arr

User · Answer

How about trying this   public static void main  String    args       int       listTwo   new int  5  5          2 Dimensional array      int x   0      int y   0      while  x  lt  5            listTwo x  y     int  Math random   10            while  y  lt 5               listTwo  x   y     int  Math random   10               System out print listTwo x  y                      y                                      System out println              y 0          x

[java] How to print a two dimensional array?

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