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--;
}
}