First way : student management system
package java_trainkj;
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
import java.util.Scanner;
/**
*
* @author user
*/
public class Stud {
private int rollno;
String name;
static String School_name;
String address;
String course;
static {
School_name = "Witshaper";
}
Stud() {
}
Stud Add(int l) {
Stud o = new Stud();
if (l > 1000) {
System.out.println(" over flow");
} else {
try {System.out.println("--------------------------");
Scanner s = new Scanner(System.in);
System.out.println(" Enter name :");
o.name = s.next();
System.out.println(" Enter Address :");
o.address = s.next();
System.out.println(" Enter Course :");
o.course = s.next();
System.out.println(" Enter rollno. :");
o.rollno = s.nextInt();
} catch (Exception e) {
System.out.println(e);
e.getMessage();
}
}
return (o);
}
void search(int rollno, int l, Stud s[]) {
for (int i = 0; i < l; i++) {
if (s[i].rollno == rollno) {
s[i].display(s[i]);
}
}
}
boolean delete(int rollno, Stud o[], int l) {
boolean t = false;
for (int i = 0; i < l; i++) {
if (rollno == o[i].rollno) {
for (int j = i; j < l - 1; j++) {
o[j] = o[j + 1];
}
t = true;
return (t);
}
}
return (t);
}
boolean update(int rollno, Stud obj[], int l) {
boolean t = false;
for (int i = 0; i < l; i++) {
if (rollno == obj[i].rollno) {
try {System.out.println("--------------------------");
Scanner s = new Scanner(System.in);
System.out.println(" Enter name :");
obj[i].name = s.next();
System.out.println(" Enter Address :");
obj[i].address = s.next();
System.out.println(" Enter Course :");
obj[i].course = s.next();
t = true;
return (t);
} catch (Exception e) {
System.out.println(e);
e.getMessage();
}
}
}
return (t);
}
void display(Stud s) {
System.out.println("--------------------------");
System.out.println(" name :" + s.name);
System.out.println(" Address :" + s.address);
System.out.println(" course :" + s.course);
System.out.println(" rollno. :" + s.rollno);
}
void show(int l,Stud s[]) {
for(int i=0;i<l;i++){
System.out.println("--------------------------");
System.out.println(" Name :" + s[i].name);
System.out.println(" Address :" + s[i].address);
System.out.println(" course :" + s[i].course);
System.out.println(" rollno. :" + s[i].rollno);
}
}
public static void main(String args[]) {
Stud obj[] = new Stud[1000];
Scanner s = new Scanner(System.in);
boolean f = true;
int choice;
int l = 0;
int r;
Stud o = new Stud();
do {
try {System.out.println("#### WELCOME ####");
System.out.println(" Enter your choice ");
System.out.println("1) ......Add");
System.out.println("2).......Delete");
System.out.println("3).......Search");
System.out.println("4).......Update");
System.out.println("5).......Display");
choice = s.nextInt();
try {
switch (choice) {
case 1:
obj[l] = o.Add(l);
l++;
break;
case 2:
System.out.println(" Enter rollno.for deletion ");
r = s.nextInt();
boolean b = o.delete(r, obj, l);
if (b = true) {l--;
System.out.println("Successfully deleted");
} else {
System.out.println(" rollno. not found");
}
break;
case 3:
System.out.println(" Enter rollno. to search student ");
r = s.nextInt();
o.search(r, l, obj);
break;
case 4:
System.out.println(" Enter rollno. for update");
r = s.nextInt();
boolean c = o.update(r, obj, l);
if (c = true) {
System.out.println("Successfully updated");
} else {
System.out.println(" rollno. not found");
}
break;
case 5:
o.show(l,obj);
default:
System.out.println(" Enter right choice");
}
} catch (Exception m) {
System.out.println(m);
}
} catch (Exception e) {
System.out.println(e);
}
System.out.println(" want to do more ... true/false");
f = s.nextBoolean();
} while (f);
}
}
// second way : student management system
package myproj.exceptionhandling;
import java.util.Scanner;
public class studentmanagement {
public static void main(String args[]) {
Scanner s = new Scanner(System.in);
int c, usr;
store ob = new store();
do {
System.out.println("::::MENU::::");
System.out.println("ENTER 1 FOR ADDING DETAIL");
System.out.println("ENTER 2 FOR SEARCHING");
System.out.println("ENTER 3 FOR DELETION");
System.out.println("ENTER 4 FOR UPDATION");
System.out.println("ENTER 5 TO EXIT");
int ch = s.nextInt();
switch (ch) {
case 1:
System.out.println("enter the no of entries");
usr = s.nextInt();
ob.add(usr);
break;
case 2:
ob.search();
break;
case 3:
ob.delete();
break;
case 4:
ob.update();
break;
case 5:
System.exit(0);
}
System.out.println("press any key other than 5 to do more operations else press 5 to exit");
c = s.nextInt();
} while (c != 5);
}
}
abstract class student {
protected String name[];
protected int roll[];
abstract void display();
}
class store extends student {
int usr;
Scanner s = new Scanner(System.in);
int i = 0, c = 0, r = 0;
store() {
roll = new int[10];
name = new String[10];
}
public void add(int usr) {
this.usr = usr;
for (i = 0; i < usr; i++) {
System.out.println("Enter name and roll no ");
name[i] = s.next();
roll[i] = s.nextInt();
}
display();
}
public void search() {
System.out.println("Enter the roll no you want to search");
r = s.nextInt();
for (i = 0; i < roll.length; i++) {
if (roll[i] == r) {
break;
}
}
System.out.println(" ");
System.out.println(" ");
System.out.println("---DETAILS OF THE SPECIFIED STUDENT IS---");
System.out.println("NAME ROLL NO");
System.out.print(name[i]+" ");
System.out.print(roll[i]);
System.out.println(" ");
System.out.println(" ");
System.out.println(" ");
}
public void delete() {
System.out.println("Enter the rollno to be deleted");
r = s.nextInt();
for (i = 0; i < roll.length; i++) {
if (roll[i] == r) {
roll[i] = 0;
name[i] = " ";
}
}
display();
}
public void update() {
System.out.println("Enter the rollno to be updated");
r = s.nextInt();
for (i = 0; i < roll.length; i++) {
if (roll[i] == r) {
System.out.println("Enter the new name and roll no");
name[i] = s.next();
roll[i] = s.nextInt();
}
}
display();
}
@Override
void display() {
System.out.println("----THE UPDATED RECORDS OF STUDENTS ARE----");
System.out.println("NAME ROLL NO");
for (i = 0; i < roll.length; i++) {
if(roll[i]!=0)
{
System.out.print(name[i]+" ");
System.out.print(roll[i]);
System.out.println(" ");
}
}
}
}
