目前我有下面提到的表，该表有学生数据，每个学生有三个记录，这取决于学生参加考试的科目数，所以如果是更多的科目，它将成为更多的记录。除了subject_id和他/她获得该主题的标记外，字段数据也是相同的。
我需要的是，为了让每个学生单行而不是3行，subject_id将放在表格的顶部，我大致在下面的代码中显示，我名为EXPECTING_ARRAY。
我尝试使用另一个二维数组，但我遇到了如何将主题移动到列的行。
###################### Current Array ##########################
+----+---------+------------+------------+-------------+----------+-------------------+-------+
| ID | stud_id | subject_id | teacher_id | activity_id | grade_id | accademic_year_id | Mark |
+----+---------+------------+------------+-------------+----------+-------------------+-------+
| 1 | 2 | 4 | 1 | 1 | 2 | 7 | 90.00 |
| 2 | 2 | 11 | 1 | 1 | 2 | 7 | 43.00 |
| 3 | 2 | 12 | 1 | 1 | 2 | 7 | 35.00 |
| 4 | 3 | 4 | 1 | 1 | 2 | 7 | 40.00 |
| 5 | 3 | 11 | 1 | 1 | 2 | 7 | 67.00 |
| 6 | 3 | 12 | 1 | 1 | 3 | 7 | 88.00 |
+----+---------+------------+------------+-------------+----------+-------------------+-------+
...
###################### Expecting Array #####################################
+------+----------+------------+-------------+-------------+-------------+--------------+-----------+--------------------+
| ID | stud_id | subject_4 | subject_11 | subject_12 | teacher_id | activity_id | grade_id | accademic_year_id |
+------+----------+------------+-------------+-------------+-------------+--------------+-----------+--------------------+
| ... | 2 | 90 | 43 | 35 | 1 | 1 | 2 | 7 |
| ... | 3 | 40 | 67 | 88 | 1 | 1 | 2 | 7 |
+------+----------+------------+-------------+-------------+-------------+--------------+-----------+--------------------+
这是我的java代码
public static void main(String[] args){
String[][] sheet = new String[7][8];
//populating data [table heading];
sheet[0][0] = "examId";
sheet[0][1] = "studId";
sheet[0][2] = "subject_id";
sheet[0][3] = "teacher_id";
sheet[0][4] = "activity_id";
sheet[0][5] = "grade_id";
sheet[0][6] = "accademic_year_id";
sheet[0][7] = "Mark";
//populating first student first row Row;
sheet[1][0] = "1";
sheet[1][1] = "2";
sheet[1][2] = "4";
sheet[1][3] = "1";
sheet[1][4] = "1";
sheet[1][5] = "2";
sheet[1][6] = "7";
sheet[1][7] = "90.00";
//populating first student Second Row;
sheet[2][0] = "2";
sheet[2][1] = "2";
sheet[2][2] = "11";
sheet[2][3] = "1";
sheet[2][4] = "1";
sheet[2][5] = "2";
sheet[2][6] = "7";
sheet[2][7] = "43.00";
//populating first student third Row;
sheet[3][0] = "3";
sheet[3][1] = "2";
sheet[3][2] = "12";
sheet[3][3] = "1";
sheet[3][4] = "1";
sheet[3][5] = "2";
sheet[3][6] = "7";
sheet[3][7] = "35.00";
sheet[3][7] = "Mark";
//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
//populating second student first row Row;
sheet[4][0] = "4";
sheet[4][1] = "3";
sheet[4][2] = "4";
sheet[4][3] = "1";
sheet[4][4] = "1";
sheet[4][5] = "2";
sheet[4][6] = "7";
sheet[4][7] = "90.00";
//populating second student Second Row;
sheet[5][0] = "5";
sheet[5][1] = "3";
sheet[5][2] = "11";
sheet[5][3] = "1";
sheet[5][4] = "1";
sheet[5][5] = "2";
sheet[5][6] = "7";
sheet[5][7] = "43.00";
//populating second student third Row;
sheet[6][0] = "6";
sheet[6][1] = "3";
sheet[6][2] = "12";
sheet[6][3] = "1";
sheet[6][4] = "1";
sheet[6][5] = "2";
sheet[6][6] = "7";
sheet[6][7] = "35.00";
//Testing Hard Coded Data
/*for(int i = 0; i< sheet.length; i++){
for(int j=0; j< sheet[i].length; j++){
System.out.print(sheet[i][j] +", ");
}
System.out.println();
}*/
//I assume that the newTable will have at least one row suppose the heading
int new_rows = 1;
//Finding how many rows, would be the new table
//i skipped if rows has same stud_id, because every student will have single row. so am count as distinct
for(int i = 1; i < sheet.length; i++)
if(!sheet[i][1].equals(sheet[i-1][1]))
new_rows++;
int new_column = 0;
//counting columns, i picked only first student how many rows has and then break the loop, so if it counts three same recording according to studId, it will be 3+ previous column - 2[which are marks and subject_id]
for(int i = 1; i<sheet.length-1; i++){
new_column++;
if(!sheet[i][1].equals(sheet[i+1][1]))
break;
}
//checking how many rows and columns found [just for debuging]
System.out.println("Rows: "+new_rows+" And Columns: "+new_column);
//creating newTable with new_records and new_column length
// here i substract 2 [marks, and subject_id are gone]
String[][] newTable = new String[new_rows][sheet[0].length + new_column -2];
//here i need to populate data to newTable but how.....!!!!!!!
for(int i = 1; i< newTable.length; i++){
int j = 1;
while(j < newTable[i].length){
newTable[i][j] = sheet[i][j];
if(!sheet[i][1].equals(sheet[i-1][1])){
System.out.print(newTable[i][j]+" | ");
}
j++;
}
System.out.println();
}
}