public static void main(String[] args) {
BigDecimal a = new BigDecimal("0.00");
System.out.println(BigDecimal.ZERO.compareTo(a) == 0); // true
System.out.println(BigDecimal.ZERO.equals(a)); // false
}

public static void main(String[] args) {
BigDecimal a = new BigDecimal("0.00");
System.out.println(BigDecimal.ZERO.compareTo(a) == 0); // true
System.out.println(BigDecimal.ZERO.equals(a)); // false
}