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public class GradeSystem { public static void main (String args[]) { ........ public int searchStu(int id){ // problem happen int i=0; for (i=0; i<4; i++) { if (student[i].getStudentID() == id) return i;} return i;} int id; boolean d; id = Integer.parseInt(JOptionPane.showInputDialog("Please input ID number : ", JOptionPane.QUESTION_MESSAGE)); d = Student.isStudent(id); …
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