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1. if(strTemp.length() > maxWordLen)
      maxWordLen = strTemp.length();
   

This could be reduced to:

maxWordLen = Math.max(maxWordLen,strTemp.length());

2. Inline the incrementation:

   charArr[i][j++] = ch;

3 . Either inline the output:

System.out.print((i != 0 ? " " : "") + charArr[i][j]);

or at least place braces:

if (i!=0){
   System.out.print(" ");
}