java--a simple student management system implemented by a pair of arrays

The author these days in Review of Java knowledge, want to deepen the basic content, hands-on operation of the development of the student management system, specifically to share the code with you, needs can be used as a reference.

Import Java.util.scanner;public class Studentmanagementsystem {public static void main (string[] args) {//Do a learning        Information management system, currently only supports the management of student information in the form of < name > (increase and deletion), that is, management is only the student's name information Scanner Scanner = new Scanner (system.in);        Boolean flage = true;            while (flage) {System.out.println ("Select the function you want to operate: \n1-Add \t2-Delete \t3-Modify \t4-query \t5-exit");            int num = Scanner.nextint ();                Switch (num) {case 1:SYSTEM.OUT.PRINTLN ("Please enter the name you want to add:");                Name = Scanner.next ();                BOOL = Add (name);                if (bool) {SYSTEM.OUT.PRINTLN ("add success");                } else {System.out.println ("Add failed");            } break;                Case 2:SYSTEM.OUT.PRINTLN ("Please enter the name you want to delete:");                String name = Scanner.next ();                bool = delete (name);                if (bool) {System.out.println ("delete succeeded");        } else {            System.out.println ("delete failed");            } break;                Case 3:SYSTEM.OUT.PRINTLN ("Please enter a name to be modified:");                Name = Scanner.next ();                System.out.println ("Please enter the modified name");                String newName = Scanner.next ();                BOOL = Update (name, newName);                if (bool) {SYSTEM.OUT.PRINTLN ("modified successfully");                } else {System.out.println ("failed to modify");            } break;                Case 4:print ();            Break Case 5:system.out.println ("Welcome to the next use, Goodbye!")                ");                Flage = false;            Break                DEFAULT:SYSTEM.OUT.PRINTLN ("Select Error, please re-enter");            Break    }} scanner.close ();    } public static String name;    public static Boolean bool;    public static string[] names = new String[3];    public static int point = 0; Add Public sTatic boolean Add (String name) {//judgment legality if (!isok (name)) {return false;            }//To determine if there is an if (query (name)! =-1) {System.out.println ("name already exists");        return false;        }//Capacity expansion if (point = = Names.length) {addcapacity ();        }//Add names[point] = name;        point++;    return true; }//Remove public static Boolean delete (String name) {//Judge legality if (!isok (name)) {return fals        E        }//To determine if there is an int index = query (name);            if (index = =-1) {System.out.println ("name does not exist");        return false;        }//delete for (int i = index, i < point; i++) {Names[i] = names[i + 1];        } point--;    return true;            }//Modify public static Boolean update (string name, String newName) {if (!isok (name) | |!isok (newName)) {        return false;        }//To determine if there isint index = query (name);            if (index = =-1) {System.out.println ("name does not exist");        return false;            } if (query (newName)! =-1) {System.out.println ("name already exists");        return false;        }//Modify names[index] = NewName;    return true; }//query public static int query (String name) {for (int i = 0; i < point; i++) {if (names[i].e            Quals (name)) {return i;    }} return-1;            }//Judge legitimacy public static Boolean isOk (String name) {if (Name.length () < 2 | | name.length () > 8) {            System.out.println ("Name is not lawful");        return false;    } return true;        }//expansion public static void Addcapacity () {string[] newnames = new string[names.length * 2];        for (int i = 0; i < names.length; i++) {newnames[i] = names[i];    } names = Newnames;        }//print public static void print () {for (int i = 0; i < point; i++) {System.out.println (names[i]); }    }}

Import Java.util.scanner;public class Studentmanagementsystem {public static void main (string[] args) {//Do a learning        Information management system, currently only supports the management of student information in the form of < name > (increase and deletion), that is, management is only the student's name information Scanner Scanner = new Scanner (system.in);        Boolean flage = true;            while (flage) {System.out.println ("Select the function you want to operate: \n1-Add \t2-Delete \t3-Modify \t4-query \t5-exit");            int num = Scanner.nextint ();                Switch (num) {case 1:SYSTEM.OUT.PRINTLN ("Please enter the name you want to add:");                Name = Scanner.next ();                BOOL = Add (name);                if (bool) {SYSTEM.OUT.PRINTLN ("add success");                } else {System.out.println ("Add failed");            } break;                Case 2:SYSTEM.OUT.PRINTLN ("Please enter the name you want to delete:");                String name = Scanner.next ();                bool = delete (name);                if (bool) {System.out.println ("delete succeeded");        } else {            System.out.println ("delete failed");            } break;                Case 3:SYSTEM.OUT.PRINTLN ("Please enter a name to be modified:");                Name = Scanner.next ();                System.out.println ("Please enter the modified name");                String newName = Scanner.next ();                BOOL = Update (name, newName);                if (bool) {SYSTEM.OUT.PRINTLN ("modified successfully");                } else {System.out.println ("failed to modify");            } break;                Case 4:print ();            Break Case 5:system.out.println ("Welcome to the next use, Goodbye!")                ");                Flage = false;            Break                DEFAULT:SYSTEM.OUT.PRINTLN ("Select Error, please re-enter");            Break    }} scanner.close ();    } public static String name;    public static Boolean bool;    public static string[] names = new String[3];    public static int point = 0; Add Public sTatic boolean Add (String name) {//judgment legality if (!isok (name)) {return false;            }//To determine if there is an if (query (name)! =-1) {System.out.println ("name already exists");        return false;        }//Capacity expansion if (point = = Names.length) {addcapacity ();        }//Add names[point] = name;        point++;    return true; }//Remove public static Boolean delete (String name) {//Judge legality if (!isok (name)) {return fals        E        }//To determine if there is an int index = query (name);            if (index = =-1) {System.out.println ("name does not exist");        return false;        }//delete for (int i = index, i < point; i++) {Names[i] = names[i + 1];        } point--;    return true;            }//Modify public static Boolean update (string name, String newName) {if (!isok (name) | |!isok (newName)) {        return false;        }//To determine if there isint index = query (name);            if (index = =-1) {System.out.println ("name does not exist");        return false;            } if (query (newName)! =-1) {System.out.println ("name already exists");        return false;        }//Modify names[index] = NewName;    return true; }//query public static int query (String name) {for (int i = 0; i < point; i++) {if (names[i].e            Quals (name)) {return i;    }} return-1;            }//Judge legitimacy public static Boolean isOk (String name) {if (Name.length () < 2 | | name.length () > 8) {            System.out.println ("Name is not lawful");        return false;    } return true;        }//expansion public static void Addcapacity () {string[] newnames = new string[names.length * 2];        for (int i = 0; i < names.length; i++) {newnames[i] = names[i];    } names = Newnames;        }//print public static void print () {for (int i = 0; i < point; i++) {System.out.println (names[i]); }    }}