Erro em "String8 op = new String8(1);"

Programação Java
#1 
import com.mtsystems.coot.String8;
import java.io.IOException;
import java.util.Scanner;
public class Q5 {
	public static void main(String[] args) throws IOException, InterruptedException {
		int a, b;
		String8 op = new String8(1);
		do {
			new ProcessBuilder("title MMC").inheritIO().start().waitFor();
			new ProcessBuilder("color 9a").inheritIO().start().waitFor();
			System.out.print("Informe dois numeros inteiros: ");
			a = STDIN_SCANNER.nextInt();
			b = STDIN_SCANNER.nextInt();
			System.out.println("m.d.c =>" + mmc2(a, b, b));
			System.out.print("\nDeseja calcular outro m.m.c (S/N)?");
			op.copyFrom(STDIN_SCANNER.next());
		} while(op.get() == 's' || op.get() == 's');
		new ProcessBuilder("Pause").inheritIO().start().waitFor();
		}
	public static int mdc2(int a, int b) {
		if (b == 0) {
			return a;
		} else {
			return mdc2(b, a % b);
		}
	}
	public static int mmc2(int a, int binta, int b) {
		int div;
		if(b == 0) {
			return a;
		} else {
			div = (a * b) / mdc2(a, b);
		}
		return div;
	}
	public final static Scanner STDIN_SCANNER = new Scanner (System.in);

}
#2

Pra que serve essa String8?