import javax.swing.JOptionPane;
   public class GradeExam {
      public static void main(String[] args) {
         char[][] answers = {
               {'A', 'B', 'A', 'C', 'C', 'D', 'E', 'E', 'A', 'D'},
               {'D', 'B', 'A', 'B', 'C', 'A', 'E', 'E', 'A', 'D'},
               {'E', 'D', 'D', 'A', 'C', 'B', 'E', 'E', 'A', 'D'},
               {'C', 'B', 'A', 'E', 'D', 'C', 'E', 'E', 'A', 'D'},
               {'A', 'B', 'D', 'C', 'C', 'D', 'E', 'E', 'A', 'D'},
               {'B', 'B', 'E', 'C', 'C', 'D', 'E', 'E', 'A', 'D'},
               {'B', 'B', 'A', 'C', 'C', 'D', 'E', 'E', 'A', 'D'},
               {'E', 'B', 'E', 'C', 'C', 'D', 'E', 'E', 'A', 'D'}};

         char[] keys = {'D', 'B', 'D', 'C', 'C', 'D', 'A', 'E', 'A', 'D'};

       //Create new array to sort students
         int[][] student = new int[8][8];

       //Echo the answers
         String result = "The answer key to the test: \n";
         for (int k = 0; k < 10; k++) {
            result += keys[k] + " ";

         }
         for (int i = 0; i < answers.length; i++) {
            int correctCount = 0;
          //Convert grades to a String
            String result2 = "Student " + (i + 1) + "'s answers are: \n";
            for (int j = 0; j < answers[i].length; j++) {
               result2 += answers[i][j] + " ";
               if (answers[i][j] == keys[j])
                  correctCount++;
               student[i][0] = correctCount;
               student[i][1] = i;

            }

          //Display the input
            JOptionPane.showMessageDialog(null, result + "\n" + result2 +
               "\nStudent " + (i + 1) + "'s correct count is " + correctCount);
         }

         bubbleSortMulti(student);
      }

      public String[][] bubbleSortMulti(String[][] MultiIn, int compIdx) {

         String[][] temp = new String[MultiIn.length][MultiIn[0].length];

         boolean finished = false;

         while (!finished) {
            finished = true;

            for (int i = 0; i < MultiIn.length - 1; i++) {

               if (MultiIn[i][compIdx].compareToIgnoreCase(MultiIn[i + 1][compIdx]) > 0){

                  for (int j = 0; j < MultiIn[i].length; j++) {
                     temp[i][j] = MultiIn[i][j];
                     MultiIn[i][j] = MultiIn[i + 1][j];
                     MultiIn[i + 1][j] = temp[i][j]; }

                  finished = false;
               }
            }
         }
         return MultiIn;
      }
   }

 ----jGRASP exec: javac -g GradeExam.java

GradeExam.java:43: bubbleSortMulti(java.lang.String[][],int) in GradeExam cannot be applied to (int[][])
         bubbleSortMulti(student);
         ^
1 error

 ----jGRASP wedge2: exit code for process is 1.
 ----jGRASP: operation complete.