java - ArrayList 到 JTable

Question

我正在尝试从 SQL srv 加载 JTable 中的数据。我在尝试转换 ArrayList 并将其加载到 JTable 时遇到麻烦。当我尝试表下方的代码时，应显示列表显示“[L].java.lang.String@bf053f”

 private void searchCourseGrades() {
StudentsWithGradeTable.setModel(dtmCoursesGrades);
String ccode = SearchCidTextfield.getText();

try {
    dtmCoursesGrades.setDataVector(
        controller.findAllStudentsFromStudied(ccode),
        coursesGradesColumns);

    if (ccode.equals("")) {
    JOptionPane.showMessageDialog(this,
        "Please enter a Course Code");

    } else {
    dtmCoursesGrades.setRowCount(0);
    dtmCoursesGrades.fireTableDataChanged();
    Studied findStudentFromStudied = null;
    findStudentFromStudied = controller
        .findCourseFromStudied(ccode);

    String[] crsgr = new String[2];

    for (int i = 0; i < crsgr.length; i++) {
    crsgr[0] = findStudentFromStudied.getSpnr();
    crsgr[1] = findStudentFromStudied.getGrade();
    dtmCoursesGrades.addRow(new Object []{crsgr});
    dtmCoursesGrades.fireTableDataChanged();
    }
    }

} catch (SQLException exception) {
    JOptionPane.showMessageDialog(this,
        "Cannot find a course with Course Code " + ccode
            + ". Please try a new number.");
}

}

MainForm 引用的 Controller 如下所示:

private String[][] finishedArrayList(ArrayList<Studied> finished) {
String[][] finishedStudents = new String[finished.size()][3];

for (int i = 0; i < finished.size(); i++) {
    Studied finish = finished.get(i);

    finishedStudents[i][0] = finish.getSpnr();
    finishedStudents[i][1] = finish.getCcode();
    finishedStudents[i][2] = finish.getGrade();
}

return finishedStudents;
}

public String[][] findAllStudentsFromStudied(String ccode)
    throws SQLException {
return finishedArrayList(dal.findAllStudentsFromStudied(ccode));

Controller 引用的 DAL 如下所示:

 public ArrayList<Studies> findAllStudentsFromStudies(String ccode)
    throws SQLException {

ArrayList<Studies> stlist = new ArrayList<Studies>();
Statement stmt = con.createStatement();
String sqlStr = "SELECT * FROM Studies WHERE ccode = '" + ccode + "'";
ResultSet rs = stmt.executeQuery(sqlStr);

while (rs.next()) {
    Studies st = new Studies();
    st.setSpnr(rs.getString(1));

    stlist.add(st);
}
rs.close();
stmt.close();
return stlist;
}

Answer 1

尝试 dtmCoursesGrades.addRow(new Object []{crsgr[0], crsgr[1]}); 而不是 dtmCoursesGrades.addRow(new Object []{crsgr});