Guess the number game Java applet

/*
Guess number game:
1, generating a random number.
2, get keyboard entry.
3, the input data into a number, and the random number comparison.
Give a hint.
4, repeat the process, if guessed, the program is over.
Note: For numbers other than input 1~100, as well as non-numbers to give a hint.

*/
Import java.io.*;
Import java.util.*;
Class Guessnumber
{
private int rannum;
Guessnumber ()
{
Random r = new Random ();
Rannum = R.nextint (+) +1;//(int) math.random () *100+1;
}

 public void Play ()
 {
  system.out.println ("Game start: Enter a number between 1~100:");
  boolean B = false;
  while (!b)
  {
   try
   {
     int num = Getnum ();
    if (num>=1 && num<=100)
     b = IsLuck (num);
    else
     system.out.println ("Value out of range");
   }
   catch (IOException e)
   {
     throw New RuntimeException ("Data entry failed");
   }
   catch (numberformatexception e)
   {
     SYSTEM.OUT.PRINTLN ("Illegal data entered");
   }
   
  }
 

Get the number of the keyboard
private int Getnum () throws Ioexception,numberformatexception
{
BufferedReader bufr = new BufferedReader (new InputStreamReader (system.in));

int num = Integer.parseint (Bufr.readline ());
return num;

}

and random number comparisons
Private boolean isluck (int num)
{
Boolean B = false;
if (num>rannum)
System.out.println ("Big, continued");
else if (num<rannum)
System.out.println ("Small, continue");
Else
{
System.out.println ("In, congratulations");
B = true;
}
return b;

}
}

Class Guessnumberdemo
{
public static void Main (string[] args)
{
New Guessnumber (). Play ();
}
}

Guess the Java applet for the number game