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JAVA program of Generating 8 digit OTP having 4 upper case alphabets and 4 numeric

package june14;

import java.util.Random;

public class generate_otp1 {
public static void main(String[] args) {

  String a= "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
  Random r= new Random ();
  System.out.println("Your OTP->");

System.out.print(a.charAt(r.nextInt(26)));
System.out.print(a.charAt(r.nextInt(26)));
System.out.print(a.charAt(r.nextInt(26)));
System.out.print(a.charAt(r.nextInt(26)));
int b = r.nextInt(10);
int c= r.nextInt(10);
int d= r.nextInt(10);
int e = r.nextInt(10);
System.out.print(b);
System.out.print(c);
System.out.print(d);
System.out.print(e);

}
}

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