Extending Thread Class and Implementing Runnable Interface

import java.util.Scanner;
class A extends Thread{
        int n;
        A(int n){
                this.n = n;
        }
        public void run(){
                for(int i = 1; i<n; i++)
                        System.out.println("\n"+i+"*300="+(300*i));
                yield();
        }
}
class B implements Runnable{
        int n;
        B(int n){
                this.n = n;
        }
        public void run(){
                long a = 0, b = 1, sum, t;
                System.out.println("\t"+a);
                System.out.println("\t"+b);
                for(int i = 0; i<n-2; i++){
                        sum = a + b;
                        System.out.println("\t"+sum);
                        t = b;
                        b = sum;
                        a = t;
                }
        }
}
class testHello{
        public static void main(String[] args){
                Scanner sc = new Scanner(System.in);
                System.out.print("Enter the limit for the Multiplication: ");
                int n1 = sc.nextInt();
                System.out.print("Enter the limit of Fibonacci Series: ");
                int n2 = sc.nextInt();
                while(n2 <= 100){
                        System.out.print("The limit should be more than 100: ");
                        n2 = sc.nextInt();
                }
                new A(n1).start();
                new Thread(new B(n2)).start();
        }
}