Java Collection Student Management system

Student.javapackage Com.sran.www;import Java.util.arrays;import Java.util.scanner;public class student implements Comparable<student>{int num; String name;int age;double[]s;double sum; Store student's total score public Student () {s=new double[3];} public static Boolean insert () {Scanner sc=new Scanner (system.in); String Str=null;boolean be=true;do{student stud=new Student (); System.out.println ("Start typing information about students ..."); System.out.print ("Study No.:"); Stud.num=sc.nextint (); System.out.print ("Name:"); Stud.name=sc.next (); System.out.print ("Age:"); Stud.age=sc.nextint (); System.out.println ("Enter the results of each class in turn:"); System.out.print ("Language:"); stud.s[0]=sc.nextdouble (); System.out.print ("Mathematics:"); stud.s[1]=sc.nextdouble (); System.out.print ("English:"); stud.s[2]=sc.nextdouble (); Stud.sum=stud.calculate_sum (); StudentTest.set.add (stud); SYSTEM.OUT.PRINTLN ("If continued input, then enter%, otherwise enter #"); System.out.print ("Please enter:"); Str=sc.next (); if (! ( Str.equals ("%") | | Str.equals ("#"))) {be=false; SYSTEM.OUT.PRINTLN ("You entered the error, has been forced to end the entry operation");}} while (Str.equals ("%") && be); return is;} Public Static Boolean Delete () {String Str=null;boolean be=true; System.out.println ("Start deleting information about students ...");d o{system.out.print ("Please enter the student number for deletion:");  Scanner sc=new Scanner (system.in); int S=sc.nextint (); Boolean flag=false; Set a flag bit for (Student Stud:StudentTest.set) {if (s==stud.num) {StudentTest.set.remove (stud); flag=true; System.out.println ("The student's information has been deleted"); if (flag==false) {System.out.println ("the student number you want to delete does not exist");} System.out.println ("If you continue to delete, enter%, otherwise enter #"); System.out.print ("Please enter:"); Str=sc.next (); if (! ( Str.equals ("%") | | Str.equals ("#"))) {be=false; SYSTEM.OUT.PRINTLN ("You entered the error, the delete operation was forced to end");}} while (Str.equals ("%") && be); return is;} public static Boolean Seek () {String Str=null;boolean be=true; System.out.println ("Start looking up information about students ...");d o {System.out.print ("Please enter the student number to find:"); Scanner sc=new Scanner (system.in); int S=sc.nextint (); Boolean flag=false;for (Student stud:StudentTest.set) {if (s==  Stud.num) {flag=true; Modify the flag bit System.out.println ("You want to find the student's information:"); System.out.println ("Study No.:" +stud.num); System.out.println ("Name:" +stud.name); SysTem.out.println ("Age:" +stud.age); System.out.println ("Language achievement:" +stud.s[0]); System.out.println ("Math score:" +stud.s[1]); System.out.println ("English score:" +stud.s[2]); break;}} if (flag==false) {System.out.println ("The student number you are looking for does not exist");} System.out.println ("If you continue to find, enter%, otherwise enter #"); System.out.print ("Please enter:"); Str=sc.next (); if (! ( Str.equals ("%") | | Str.equals ("#"))) {be=false; SYSTEM.OUT.PRINTLN ("You entered the error, have forced the end of the query operation");}} while (Str.equals ("%") && be); return is;} Public double calculate_sum () {Sum=s[0]+s[1]+s[2];return sum;} @Overridepublic int compareTo (Student stud) {this.sum=this.calculate_sum (); Stud.sum=stud.calculate_sum (); if (  This.sum>stud.sum) Return-1;else if (this.sum<stud.sum) return 1;else{if (This.name.compareTo (stud.name) >0) Return-1;else if (This.name.compareTo (stud.name) <0) return 1;elsereturn 0;}} Public String toString () {System.out.println ("study number" + "\t\t" + "name" + "\t\t" + "age" + "\t\t" + "language" + "\t\t" + "math" + "\t\t" + "English" + "\ T \ t "+" total Score ") Return (num+" \t\t "+name+" \t\t "+age+" \t\t "+s[0]+" \t\t "+s[1]+" \t\t "+s[2]+" \t\t "+sum);} PublIC Static Boolean update () {String Str=null;boolean bot=true; System.out.println ("Start updating student information ...");d o{system.out.print ("Please enter the student number to be updated:"); Scanner sc=new Scanner (system.in); int S=sc.nextint (); Boolean Be=false;boolean br=false;for (Student Stud: Studenttest.set) {if (stud.num==s) {be=true;//modifies the flag bit System.out.println ("Enter which item to update: Where 1 represents the study number, 2 represents the name, 3 represents the age, 4 represents the language score, 5 for mathematical results, 6 for English score "); System.out.print ("Please enter:"); int n=sc.nextint (); switch (n) {case 1:{system.out.print ("Please enter the modified number:"); stud.num=sc.nextint (); SYSTEM.OUT.PRINTLN ("modified success"); Case 2:{system.out.print ("Please enter the modified name:"); Stud.name=sc.next (); SYSTEM.OUT.PRINTLN ("modified success"); Case 3:{system.out.print ("Please enter the Modified Age:"); Stud.age=sc.nextint (); SYSTEM.OUT.PRINTLN ("modified success"); Case 4:{system.out.print ("Please enter the revised language score:"); stud.s[0]=sc.nextdouble ();  SYSTEM.OUT.PRINTLN ("modified successfully"); Stud.sum=stud.calculate_sum (); Re-update the total score br=true;break;} Case 5:{system.out.print ("Please enter the revised Math score:"); stud.s[1]=sc.nextdouble ();  SYSTEM.OUT.PRINTLN ("modified successfully"); Stud.sum=stud.calculate_sum (); Re-update the total score br=true;break;} CaSe 6:{system.out.print ("Please enter the revised English score:"); stud.s[2]=sc.nextdouble ();  SYSTEM.OUT.PRINTLN ("modified successfully"); Stud.sum=stud.calculate_sum (); Re-update total Br=true;break;}}} if (br==true) {Object[]obj=studenttest.set.toarray (); Arrays.sort (obj); StudentTest.set.clear (); for (int i=0;i<obj.length;i++) {Student st= (Student) obj[i]; StudentTest.set.add (ST);}} if (be==false) {System.out.println ("You want to modify the student's number does not exist");} System.out.println ("If you continue to modify, enter%, otherwise enter #"); System.out.print ("Please enter:"); Str=sc.next (); if (! ( Str.equals ("%") | | Str.equals ("#"))) {bot=false; SYSTEM.OUT.PRINTLN ("You entered the error, the update operation was forced to end");}} while (Str.equals ("%") && bot); return bot;}}

Studenttestpackage com.sran.www;import java.util.scanner;import Java.util.set;import java.util.TreeSet;public  Class Studenttest {static set<student>set=null;  Define collection, store student information public void fun () {int I;boolean b,bt;set=new treeset<student> (); Do{int flag=0; System.out.println ("Please enter 1,2,3,4,5 1 for input, 2 for deletion, 3 for search, 4 for the total student score, and 5 for updating a student data"); System.out.print ("Please enter:"); Scanner sc=new Scanner (system.in); int n=sc.nextint (); switch (n) {case 1:{b=student.insert (); if (b==true) { System.out.println ("Normal End entry operation ...");} Flag=1;break;} Case 2:{b=student.delete (); if (b==true) {System.out.println ("normal end delete operation ..."); Flag=1;break;} Case 3:{b=student.seek (); if (b==true) {System.out.println ("normal end query operation ..."); Flag=1;break;} Case 4:{system.out.println ("Start ranking student information ....."); SYSTEM.OUT.PRINTLN ("Student ranked by total score:"); for (Student Stud:set) {System.out.println (stud); System.out.println ();} System.out.println ("Normal end ranking operation ..."); flag=1;break;} Case 5:{b=student.update (); if (b==true) {System.out.println ("normal End update operation ...");} Flag=1;break;}} if (flag==0{SYSTEM.OUT.PRINTLN ("you entered the wrong, please re-enter");} System.out.println ();d o {bt=false; System.out.println ("Continue all student information operation, please enter 1 exit Student information System, please enter 0"); System.out.print ("Please enter:"); I=sc.nextint (); if (i!=1 && i!=0) {bt=true; SYSTEM.OUT.PRINTLN ("Input error, please re-enter");}} while (bt==true);} while (i==1); SYSTEM.OUT.PRINTLN ("You have exited student information system .....");} public static void Main (string[] args) {new Studenttest (). Fun ();}}

Java Collection Student Management system