java student information management system source code
- 2020-12-26 05:45:56
- OfStack
This article shares the specific code of java student information management system for you, and realizes the student information: add int[] a=new int[9], delete, find, change, for your reference, the specific content is as follows
/* Student information management system to realize student information:
* increase int[] a=new int[9]
* delete
* To find the
* To change the
*/
import java.util.Scanner;// The import java The input stream
import java.lang.*;
import java.io.*;
class Student
{
private static Student[] s=new Student[2];
int n=0;
private String name;
private int num;
private String classAge;
public void judge()throws IOException
{
int i;
char ch;
String str;
Scanner In=new Scanner(System.in);
if(n==0)
{
System.out.print(" You haven't typed in any students, have you (Y/N):");
str=In.next();
ch=str.charAt(0);
while(ch!='Y'&&ch!='y'&&ch!='N'&&ch!='n')
{
System.out.print(" Incorrect input. Please re-enter :");
str=In.next();
ch=str.charAt(0);
}
if(ch=='Y'||ch=='y')
{
this.add();
}
if(ch=='N'||ch=='n')
{
this.menu();
}
}
}
public void menu()throws IOException// Define menu functions
{
int a;// define switch Statement variables
Scanner in=new Scanner(System.in);// Instantiate the input stream object
System.out.println("********* Student Information management system function sheet *********");
System.out.println("***** 1. increase *****");
System.out.println("***** 2. According to *****");
System.out.println("***** 3. Modify the *****");
System.out.println("***** 4. delete *****");
System.out.println("***** 5. To view *****");
System.out.println("***** 0. exit *****");
System.out.println("****************************************");
System.out.print(" Please select a (0~5):");
a=in.nextInt();
while(a<0||a>5)
{
System.out.print(" Input out of range, please re-enter :");
a=in.nextInt();
}
switch(a)
{
case 1:this.add();break;
case 2:this.show();break;
case 3:this.modif();break;
case 4:this.delete();break;
case 5:this.look();break;
case 0:System.exit(0);break;
}
}
public void add()throws IOException// Define the increment function
{
String str,str1,str2;
int i,num1,t=1;
char ch,ch1;
FileWriter fw=new FileWriter("F://javaFile//student.txt",true);
fw.write(" List of student information entered \r\n\r\n Student id The name The class \r\n");
Scanner In=new Scanner(System.in);
while(t==1)
{
System.out.print(" Please enter your student number :");
num1=In.nextInt();
for(i=0;i<n;i++)
{
while(s[i].num==num1)
{
System.out.println(" This student number already exists, please re-enter it ");
System.out.print(" Please enter your student number :");
num1=In.nextInt();
}
}
s[n].num=num1;
str2=String.valueOf(num1);
fw.write(str2+" ");
System.out.println();
System.out.print(" Please enter the student's name :");
s[n].name=In.next();
fw.write(s[n].name+" ");
System.out.println();
System.out.print(" Please enter student class :");
s[n].classAge=In.next();
fw.write(s[n].classAge+"\r\n");
++n;
fw.close();
System.out.println();
System.out.print(" Whether to continue to add (Y/N)");
str=In.next();
ch=str.charAt(0);
while(ch!='N'&&ch!='n'&&ch!='Y'&&ch!='y')
{
System.out.print(" Incorrect input. Please re-enter :");
str=In.next();
ch=str.charAt(0);
}
if(ch=='N'||ch=='n')
{
break;
}
}
System.out.println();
System.out.print(" Whether to return to the main menu (Y/N)");
str1=In.next();
ch1=str1.charAt(0);
while(ch1!='Y'&&ch1!='y'&&ch1!='N'&&ch1!='n')
{
System.out.print(" Incorrect input. Please re-enter :");
str1=In.next();
ch1=str1.charAt(0);
}
if(ch1=='Y'||ch1=='y')
{
this.menu();
}
if(ch1=='N'||ch1=='n')
{
System.out.println(" Is out of ... Thank you for using !");
System.exit(0);
}
}
public void show()throws IOException
{
int i;
this.judge();
System.out.println(" This operation is input altogether "+n+" student !");
System.out.println(" The student information you entered is as follows :");
System.out.println();
System.out.println(" Student id \t\t The name \t The class ");
for(i=0;i<n;i++)
{
System.out.println(s[i].num+" "+s[i].name+" "+s[i].classAge);
}
System.out.println(" The system returns to the main menu !");
this.menu();
}
public void delete()throws IOException// Delete information function implementation Note: This function is not extensible for the time being
{
this.judge();
int j=0,t=0,k=0,num1;
char ch;
String str;
Scanner pin=new Scanner(System.in);
System.out.print(" Please enter the student number you want to delete :");
num1=pin.nextInt();
for(j=0;j<n;j++)
{
if(s[j].num==num1)
{
k=1;
t=j;
}
}
if(k==0)
{
System.out.println(" I'm sorry! The student number you want to delete does not exist! ");
System.out.println(" The system will return to the main menu! ");
this.menu();
}
if(k==1)
{
System.out.println(" The student information you want to delete is as follows :");// Print the student information that the administrator wants to delete
System.out.println(" Student id \t The name \t The class ");// This feature is not extensible for the time being
System.out.println(s[t].num+" "+s[t].name+" "+s[t].classAge);
System.out.println();
System.out.print(" You're sure you want to delete it (Y/N):");
str=pin.next();
ch=str.charAt(0);
while(ch!='Y'&&ch!='y'&&ch!='N'&&ch!='n')
{
System.out.print(" Incorrect input. Please re-enter :");
str=pin.next();
ch=str.charAt(0);
}
if(ch=='N'||ch=='n')
{
System.out.println();
System.out.println(" System returns to main menu! ");
this.menu();
}
if(ch=='Y'||ch=='y')
{
for(j=t;j<n-1;j++)
{
s[j]=s[j+1];
}
n--;
System.out.println(" Data was deleted successfully !");
System.out.println(" The system returns to the main menu !");
this.menu();
}
}
}
public void look()throws IOException
{
FileReader fr=new FileReader("F://javaFile//student.txt");
int a;
while((a=fr.read())!=-1)
{
System.out.print((char)a);
}
fr.close();
System.out.println(" System returns to main menu! ");
System.out.println();
this.menu();
}
public void modif()throws IOException
{
this.judge();
int j=0,t=0,k=0,num2,num3,moi,c=1;
char ch;
String str,str1,str2;
Scanner pin=new Scanner(System.in);
System.out.print(" Please enter the student number you want to modify :");
num2=pin.nextInt();
for(j=0;j<n;j++)
{
if(s[j].num==num2)
{
k=1;
t=j;
}
}
if(k==0)
{
System.out.println(" I'm sorry! The student number you want to modify does not exist! ");
System.out.println(" The system will return to the main menu! ");
this.menu();
}
if(k==1)
{
System.out.println(" The student information you want to modify is as follows :");// Print the student information that the administrator wants to delete
System.out.println(" Student id \t The name \t The class ");// This feature is not extensible for the time being
System.out.println(s[t].num+" "+s[t].name+" "+s[t].classAge);
System.out.println();
System.out.print(" You're sure you want to change it (Y/N):");
str=pin.next();
ch=str.charAt(0);
while(ch!='Y'&&ch!='y'&&ch!='N'&&ch!='n')
{
System.out.print(" Incorrect input. Please re-enter :");
str=pin.next();
ch=str.charAt(0);
}
if(ch=='N'||ch=='n')
{
System.out.println();
System.out.println(" System returns to main menu! ");
this.menu();
}
while(c==1)
{
if(ch=='Y'||ch=='y')
{
System.out.println("****************************************");
System.out.println("***** 1. Modify the student id *****");
System.out.println("***** 2. Modify the class *****");
System.out.println("***** 3. Modify the name *****");
System.out.println("****************************************");
System.out.print(" Please select a :");
moi=pin.nextInt();
switch(moi)
{
case 1:System.out.print(" Please enter your new student number :");num3=pin.nextInt();s[t].num=num3;break;
case 2:System.out.print(" Please enter the new class :");str1=pin.next();s[t].classAge=str1;break;
case 3:System.out.print(" Please enter a new name :");str2=pin.next();s[t].name=str2;break;
}
System.out.println(" The data has been modified successfully! ");
}
System.out.print(" Whether to continue to modify (Y/N)");
str=pin.next();
ch=str.charAt(0);
System.out.println();
while(ch!='Y'&&ch!='y'&&ch!='N'&&ch!='n')
{
System.out.print(" Incorrect input. Please re-enter :");
str=pin.next();
ch=str.charAt(0);
}
if(ch=='N'||ch=='n')
{
break;
}
}
}
System.out.println();
System.out.println(" System returns to main menu! ");
this.menu();
}
public static void main(String[] args)throws IOException
{
Student stu=new Student();
for(int i=0;i<2;i++)
{
s[i]=new Student();
}
stu.menu();
}
}
For more information, please pay attention to the topic management System Development.