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public class Student { /** * declare properties private. * @param String name * @param String id * @param String group * @param String email */ private String name; private String id; private String group; private String email; /** * getName. */ public String getName() { return name; } /** * getId. */ public String getId() { return id; } /** * getGroup. */ public String getGroup() { return group; } /** * getEmail. */ public String getEmail() { return email; } /** * setName. */ public void setName(String name) { this.name = name; } /** * setId. */ public void setId(String id) { this.id = id; } /** * setGroup. */ public void setGroup(String group) { this.group = group; } /** * setEmail. */ public void setEmail() { this.email = email; } /** * getInfo. */ public String getInfo() { return name + " - " + id + " - " + group + " - " + email; } /** * Constructor. */ public Student() { name = "Student"; id = "000"; group = "K62CB"; email = "uet@vnu.edu.vn"; } /** * Constructor. */ Student(String name, String id, String email) { this.name = name; this.id = id; this.email = email; group = "K62CB"; } /** * Constructor. */ Student(Student s) { this.name = s.name; this.id = s.id; this.group = s.group; this.email = s.email; } } public class StudentManagement { /** * declare array. * @param int index */ private Student[] students = new Student[100]; private int index = 0; /** * compare two student group. */ public static boolean sameGroup(Student s1, Student s2) { return s1.getGroup().equals(s2.getGroup()); } /** * addStudent. */ public void addStudent(Student newStudent) { students[index] = newStudent; index++; } /** * studentsByGroup. */ public String studentsByGroup() { if (index == 0) { return ""; } String[] filteredGroup = new String[100]; int tmp = 0; String ans = ""; for (int i = 0; i < index; i++) { boolean check = false; for (int j = 0; j < tmp; j++) { if ((students[i].getGroup()).equals(filteredGroup[j])) { check = true; break; } } if (!check) { filteredGroup[tmp] = students[i].getGroup(); tmp++; } } for (int i = 0; i < tmp; i++) { ans = ans + filteredGroup[i] + "\n"; for (int j = 0; j < index; j++) { if ((students[j].getGroup()).equals(filteredGroup[i])) { ans = ans + students[j].getInfo() + "\n"; } } } return ans; } /** * removeStudent. */ public void removeStudent(String id) { int removeIndex = -1; for (int i = 0; i < index; i++) { if (students[i].getId().equals(id)) { removeIndex = i; break; } } if (removeIndex == -1) { return; } for (int i = removeIndex; i < index; i++) { students[i] = students[i + 1]; } students[index - 1] = null; index--; } }