how to validate records like only 10 record allowed...

[Ronak Dhorajiya]

import java.io.*;
 
class Studentinfo
{
    private int rlno,m1,m2,m3;
    private String sname;
 
    public void getdata(int rlno1,String sname1,int m11,int m22,int m33)
    {
 
        rlno=rlno1;
        sname=sname1;
        m1=m11;
        m2=m22;
        m3=m33;
    }
 
 
 
    void putdata(Studentinfo []students,int s_rlno,int cnt)
    {
        int f=0;
        int i=0;
        int total=0;
        float per=0;
        for(i=0;i<cnt;i++)
        {
            if(students[i].rlno==s_rlno)
            {
                total=total+students[i].m1+students[i].m2+students[i].m3;
                per=per+total/3;
                System.out.println("\n Student Roll no :"+students[i].rlno);
                System.out.println("\n student Name : "+students[i].sname);
                System.out.println("\n student marks in m1 :"+students[i].m1);
                System.out.println("\n student marks in m2 :"+students[i].m2);
                System.out.println("\n student marks in m3 :"+students[i].m3);
                System.out.println("\n student total marks :"+total);
                System.out.println("\n student percentage :"+per);
            }
        }
    }
 
    public void putdata(Studentinfo [] students,int cnt)
    {
        int i=0;
        int total=0;
        float per=0;
        for(i=0;i<cnt;i++)
        {
            total=total+(students[i].m1+students[i].m2+students[i].m3/3);
            per=total/3;
            System.out.println("\n The percentage of student :"+per);
        }
    }
}
public class Student
{
    public static void main(String [] args) throws IOException
    {
        int cnt=0;
        int ch,f=0;
 
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));    
        Studentinfo students[] = new Studentinfo[10];
        do
        {
            System.out.println("\n 1.Enter student Information.");
            System.out.println("\n 2.Display Student Information.");
            System.out.println("\n 3.Display all Student percentage.");
            System.out.println("\n 4.Exit ");
 
            System.out.println("\nEnter Your choice : ");
            ch=Integer.parseInt(br.readLine());
 
            switch(ch)
            {
                case 1:
                    if(cnt==10)
                    {
                        System.out.println("\n Sorry Data storage Limit Reached ");
                        break;
                    }
                    System.out.println(" Enter Student Roll no:");
                    int srlno1=Integer.parseInt(br.readLine());
                    System.out.println(" Enter student name :");
                    String sname1=br.readLine();
                    System.out.println(" Enter student marks 1 :");
                    int m11=Integer.parseInt(br.readLine());
                    System.out.println(" Enter student marks 2 :");
                    int m22=Integer.parseInt(br.readLine());
                    System.out.println(" Enter student marks 3 :");
                    int m33=Integer.parseInt(br.readLine());
 
                    students[cnt] =new Studentinfo();
                    students[cnt++].getdata(srlno1,sname1,m11,m22,m33);
                    f=1;
                    break;
                case 2:
 
                    System.out.println("\n Enter Roll NO :");
                    int s_rlno=Integer.parseInt(br.readLine());
                    students[0].putdata(students,s_rlno,cnt);
                    break;
                case 3:
                    students[0].putdata(students,cnt);
                    break;
                case 4:
                    System.out.println("\n Thank you ");
                    break;
                default:
                    System.out.println("\n Invalid option ");
            }
            }while(ch!=4);
        }
 
};
 

when there are no records then i want to display one message like no record found...
when i select choice-2 and if there is no record then it must display msg..