public class BiNumber { private int number1; private int number2; public BiNumber(int number1, int number2) { this.number1 = number1; this.number2 = number2; } public int getNumber1() { return number1; } public int getNumber2() { return number2; } public int calculateGCD() { // Write your code here if(number1 == 0 || number2 == 0){ return 0; }else if(number1 < 0 || number2 < 0){ return 1; } if(n..