How can I sort each column in a user input 3x3 2d array from smallest to largest? in JAVA language

Question

Ive looked at other questions/answers on this website. however none seem to be solving this problem specifically. This is my code so far but I am > getting a
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 3 at > > ColumnSorting.sortColumns(ColumnSorting.java:13) at > > TestColumnSorting.main(TestColumnSorting.java:19)
error when i run it.

public static int[][] sortColumns(int[][] matrix)
       {
          int tmp = 0;
          int ct = 0;
          for(int column = 0; column < matrix[ct].length; column++)
          {
             for(int row = 0; row < matrix.length; row++) 
             {
                for (int i = row+1; i < matrix.length; i++) 
                {
                   if(matrix[row][column] > matrix[i][column])
                   {
                      tmp = matrix[row][column];
                      matrix[row][column] = matrix[i][column];
                      matrix[i][column] = tmp ;
                   }
                }
             }
             ct++;
          }
       return matrix;

Answer 1

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 3

You're getting this error because at the end of your for loops when you do ct++ you will eventually get ct=3 . Since array indexing starts at 0, your 3x3 column indices will go from 0-2. So when ct=3 and you do matrix[ct].length you will get an array out of bounds error.