Import? Java . util . *；
Import? Java . util . scanner；
Public? Class? Bd05？ {
Public? Static electricity Final? Scanner? s？ =? New? Scanner (system. in);
Public? Static electricity Invalid? main(String[]？ args)？ {
ArrayList & lt student & gt? Al. =? New? ArrayList & lt student & gt ();
Home (al);
}
Public? Static electricity Invalid? Home page (list & lt students & gt? List) {
while(true){
System.out.println(" 1。 Enter student information? 2. Inquire about student information? 3. Delete student information? 4. Exit \ nInput number selection: ");
int？ num？ =? s . nextint()；
Switches (Qty)
Case? 1:
InputInfo (list);
Break;
Case? 2:
FindInfo (list);
Break;
Case? 3:
Delete (list);
Break;
Case? 4:
system . exit(0)；
}
}
}
Public? Static electricity Invalid? findInfo(List & lt； Student & gt? List){// Query information
System.out.println(" 1。 Ascending order? 2. down 3. Return \ Enter a number to select the query method (total score of two subjects): ";
int？ num？ =? 0;
while(true){
num？ =? s . nextint()；
If(num = = 1){// ascending order
Collections.sort(list，new？ Comparator & lt student & gt(){
Public? int？ Comparison (student? s 1，？ Student? s2)？ {
int？ n？ =? New? integer(s 1 . get Chinese()+s 1 . get math())。 CompareTo (new? integer(S2 . get Chinese()+S2 . get math())；
If (n==0)
Return? s 1.getName()。 compare to(S2 . getname())；
Return? n；
}
});
PrintAll (list);
}
Or what? If(num = = 2){// descending order
Collections.sort(list，new？ Comparator & lt student & gt(){
Public? int？ Comparison (student? s 1，？ Student? s2)？ {
int？ n？ =? New? integer(S2 . get Chinese()+S2 . get math())。 CompareTo (new? integer(s 1 . get Chinese()+s 1 . get math())；
If (n==0)
Return? s2.getName()。 compare to(s 1 . getname())；
Return? n；
}
});
PrintAll (list);
}
Or what? If (quantity ==3)
Break;
other
System.out.println ("input error, re-input:");
}
Home page (list);
}
Public? Static electricity Invalid? Delete (list & lt students & gt? List){// Delete information
System.out.print ("Enter the name to delete:");
String? Name? =? s . next()；
Iterator & lt student & gt? It? =? list . list iterator()；
while(it.hasNext()){
Student? str？ =? it . next()；
if(name . equals(str . getname()){
it . remove()；
System.out.println(name+"？ Deleted successfully! ”);
}
}
System.out.println(" 1。 Continue? 2.Return \ Input number selection: ");
while(true){
int？ num？ =? s . nextint()；
if(num== 1){
Delete (list);
}
Or what? If (quantity ==2)
Break;
other
System.out.println ("input error, re-input:");
}
Home page (list);
}
Public? Static electricity Invalid? print all(List & lt； Student & gt? List) {
int？ num？ =? 1;
System. Out.println ("-(query));
For (students? Student: List) {
System.out.println(num++？ +".Name:" +stu.getName()+"| Chinese score: "+stu.getChinese()+"| Math score:" +stu.getmath ()+"-| Total score: "+(+(stu.getChinese ()+stu.getmath
}
system . out . println("-")；
Home page (list);
}
Public? Static electricity Invalid? input info(List & lt； Student & gt? List){// Enter information.
System.out.println ("Enter student name:");
String? Name? =? s . next()；
System.out.println ("Input Math Score:");
int？ Math? =? s . nextint()；
System.out.println ("Enter language score:");
int？ China? =? s . nextint()；
List.add (new? Students (name, math, Chinese));
System.out.println(" 1。 Return? 2. Continue to input \ nInput number selection: ");
while(true){
int？ num？ =? s . nextint()；
if(num== 1)
Break;
Or what? If (quantity ==2)
InputInfo (list);
other
System.out.println ("input error, re-input:");
}
Home page (list);
}
}
Class? Students {
Private? String? Name;
Private? int？ Chinese;
Private? int？ Mathematics;
Student (string? Name, int? Math, int? Chinese) {
This name? =? Name;
This. Chinese food? =? Chinese;
This math? =? Mathematics;
}
Public? StringgetName(){
Return? Name;
}
Public? int？ getChinese(){
Return? Chinese;
}
Public? int？ getMath(){
Return? Mathematics;
}
}