java - I am getting an array out of bound exception for this piece of code -

public  compressimage(){  }   // compress image method public static short[] compress(short image[][]){      // image dimensions     int imagelength = image.length;   // row length     int imagewidth = image[0].length; // column length           // convert vertical horizontal       // store transposed image     short[][] transposeimage = new short[imagewidth][imagelength];      // rotate +90     (int = 0; < imagewidth; i++)     {           (int j = 0; j < imagelength; j++)           {              short temp = image[i][j];              transposeimage[i][j] = image[j][i];              transposeimage[j][i] = temp;          }     } 

short temp = image[i][j]; transposeimage[i][j] = image[j][i]; transposeimage[j][i] = temp; 

why swapping here? doesn't make sense - transposeimage new matrix, don't have inplace editing. guaranteed break if imagewidth != imagelength - see if can figure out why.

and, actually, you're not swapping. 3 lines above equivalent to:

transposeimage[i][j] = image[j][i]; transposeimage[j][i] = image[i][j]; 

the body of nested loop should be:

transposeimage[i][j] = image[j][i];