Small Practice---Class student management system

Requirements:

The following features are implemented:

① add a class;

② add students to the class;

③ query class, students;

④ Delete class, student;

Analysis:

Object:

① class: Class number, class name, student array;

② Students: School number, name, gender, age;

Completed in MyEclipse: new 4 classes

①student

Package Studentmanagement;public class Student {private string Sno;private string sname;private string ssex;private int SA Ge;public Student () {super ();} Public Student (String sno, String sname, string ssex, int sage) {super (); This.sno = Sno;this.sname = Sname;this.ssex = SSE X;this.sage = Sage;} Public String Getsno () {return sno;} public void Setsno (String sno) {This.sno = sno;} Public String Getsname () {return sname;} public void Setsname (String sname) {this.sname = sname;} Public String Getssex () {return ssex;} public void Setssex (String ssex) {this.ssex = Ssex;} public int getsage () {return sage;} public void setsage (int sage) {this.sage = sage;}}

②class

package Studentmanagement;public class Class {private string Cno;private string Cname;private student[] stus;private int size;private int count=0;public Class () {this.size=10;stus=new Student[ This.size];} Public Class (String cno, string cname, int size) {super (); this.cno = Cno;this.cname = Cname;this.size = Size;stus=new Stu Dent[this.size];} Public String Getcno () {return CNO;} public void Setcno (String cno) {this.cno = CNO;} Public String Getcname () {return CNAME;} public void Setcname (String cname) {this.cname = CNAME;} Public student[] Getstus () {return stus;} public void Setstus (student[] stus) {this.stus = Stus;} public int GetSize () {return size;} public void setSize (int size) {this.size = size;} public int GetCount () {return count;} public void SetCount (int count) {This.count = count;} public void Addstudent (Student stu) {if (count<stus.length) {stus[count]=stu;count++; System.out.println ("Add Student success!");} ELSE{SYSTEM.OUT.PRINTLN ("Class size is full!");}} 

③manageservice

Package Studentmanagement;import Java.util.scanner;public class Manageservice {private class[] classes;private int size ;p rivate int count = 0;public Manageservice () {this.size = 10;classes = new Class[this.size];} public manageservice (int size) {this.size = Size;classes = new Class[this.size];} public void Addclazz (Class c) {if (count<classes.length) {Classes[count] = c;count++; SYSTEM.OUT.PRINTLN ("class added success! ");} ELSE{SYSTEM.OUT.PRINTLN ("Class number reaches the limit, cannot add Class!") ");}} public void Printallclass () {System.out.println ("class number \ t class name"); for (int i=0;i<classes.length;i++) {Class C = classes[ I];if (c!=null) {System.out.println (C.getcno () + "\ T" +c.getcname ());}}} Public Class Getclassbyno (String cno) {Class clazz = null;for (int i=0;i<classes.length;i++) {Class C = classes[i];if (c! =null) {if (C.getcno (). Equals (CNO)) {clazz = c;}} Else{break;}} return clazz;} Public student[] Getstusbyclass (String cno) {student[] Stus = null;for (int i=0;i<classes.length;i++) {Class c = classes [I];if (C!=null) {if (C.getcno (). Equals (CNO)) {Stus= C.getstus ();}} Else{break;}} return stus;} Public Student Getstubyno (String Sno) {Student stu = null;for (int i=0;i<classes.length;i++) {Class c = classes[i];if (c! =null) {student[] Stus = C.getstus (); for (int j=0;j<stus.length;j++) {Student s = stus[j];if (s!=null) {if (S.getsno (). Equals (Sno)) {Stu = s;}} Else{break;}}} Else{break;}} return Stu;} public void Deletestubyno (String sno) {for (int i=0;i<classes.length;i++) {Class c = classes[i];if (C!=null) {student[] Stus = C.getstus (); for (int j=0;j<stus.length;j++) {Student s = stus[j];if (s!=null) {if (S.getsno (). Equals (Sno)) {Stus [j] = null;}} Else{break;}}} Else{break;}}} public void Deleteclassbyno (String cno) {for (int i=0;i<classes.length;i++) {Class c = classes[i];if (C!=null) {if ( C.getcno (). Equals (CNO)) {classes[i]=null;}} Else{break;}}} public void Run () {System.out.println ("Welcome to sue College management system!") "); Scanner sc = new Scanner (system.in), while (true) {System.out.println ("1. Adding classes, 2. Adding students, 3. viewing classes, 4. Viewing students, 5. Deleting a student, 6. Deleting a class, 7. Exit "); String comd = Sc.next (), if (Comd.equals ("1")) {System.out.println ("Please enter class Number:"); String CNO = Sc.next (); Class C = Getclassbyno (CNO), if (c==null) {System.out.println ("Please enter class name, number of people:"); String cname = Sc.next (); int size = Sc.nextint (); c = new Class (CNO, CNAME, size); Addclazz (c);} Else{system.out.println ("Class already exists!") ");}} else if (Comd.equals ("2")) {System.out.println ("Please enter class Number:"); String CNO = Sc.next (); Class C = Getclassbyno (CNO); if (c!=null) {System.out.println ("Please enter the number, name, gender, Age:"); String sno = Sc.next (); String sname = Sc.next (); String ssex = Sc.next (); int sage=sc.nextint (); Student stu = new Student (Sno, sname, Ssex, Sage); C.addstudent (Stu);} ELSE{SYSTEM.OUT.PRINTLN ("class does not exist!") ");}} else if (Comd.equals ("3")) {Printallclass ();} else if (Comd.equals ("4")) {System.out.println ("1. According to Class View, 2. View student's personal details"); String type = Sc.next (), if (Type.equals ("1")) {System.out.println ("Please enter class Number:"); String CNO = Sc.next (); student[] Stus = Getstusbyclass (CNO), if (stus!=null) {System.out.println ("the number \ t name \ t gender \ t age"); for (int j=0;j< stus.length;j++) {Student s = stus[j];if (s!=null) {System.out.prinTLN (S.getsno () + "\ T" +s.getsname () + "\ T" +s.getssex () + "\ T" +s.getsage ());} Else{break;}}} ELSE{SYSTEM.OUT.PRINTLN ("Class does not exist, or there is no student in this class!") ");}} else if (Type.equals ("2")) {System.out.println ("Please enter Number:"); String sno = Sc.next (); Student stu = Getstubyno (SNO), if (stu!=null) {System.out.println ("school number \ t name \ t gender \ t age"); System.out.println (Stu.getsno () + "\ T" +stu.getsname () + "\ T" +stu.getsno () + "\ T" +stu.getsage ());} ELSE{SYSTEM.OUT.PRINTLN ("Student" +sno+ "does not exist!") ");}}} else if (Comd.equals ("5")) {System.out.println ("Please enter Number:"); String sno = Sc.next (); Student stu = Getstubyno (SNO), if (stu!=null) {Deletestubyno (SNO); System.out.println ("Delete succeeded! ");} ELSE{SYSTEM.OUT.PRINTLN ("Student" +sno+ "does not exist!") ");}} else if (Comd.equals ("6")) {System.out.println ("Please Lose Class Number:"); String CNO = Sc.next (); Class C = Getclassbyno (CNO), if (c!=null) {deleteclassbyno (CNO); System.out.println ("Delete succeeded! ");} Else{system.out.println ("Class" +cno+ "does not exist!") ");}} else if (Comd.equals ("7")) {System.out.println ("System exits! "); System.exit (0);} ELSE{SYSTEM.OUT.PRINTLN ("The order is illegal! ");}}}}

④app

Package Studentmanagement;public class App {public static void main (string[] args) {manageservice ss=new Manageservice (5) ; Ss.run ();}}

　　

Small Practice---Class student management system