BigDecimal(1).subtract

`BigDecimal(1).subtract()` is the beginning of a code statement that uses the `subtract()` method of the `BigDecimal` class in Java.

The `BigDecimal` class is used to perform mathematical operations with high precision and accuracy, especially when dealing with very large or very small numbers. The `subtract()` method of the `BigDecimal` class is used to subtract a given value from the `BigDecimal` object.

For example, the following code statement subtracts the value of `2` from a `BigDecimal` object `num`:

BigDecimal num = new BigDecimal(3);
num = num.subtract(new BigDecimal(2));

After executing this statement, the value of `num` will be `1`.

Note that when using the `subtract()` method, a new `BigDecimal` object is returned with the result of the subtraction, and the original object remains unchanged. Therefore, it is necessary to assign the result of the `subtract()` method back to the original object if you want to update its value.

The `subtract()` method can also take a `BigDecimal` object as an argument, allowing you to subtract one `BigDecimal` object from another. For example:

BigDecimal num1 = new BigDecimal(3);
BigDecimal num2 = new BigDecimal(2);
BigDecimal result = num1.subtract(num2);

After executing this statement, the value of `result` will be `1`.