private static void someTransaction() {
    doTransaction1();
    doTransaction2();
    doTransaction3();
}

private static void doTransaction1() {
    System.out.println(2.0 - 1.1);
}

private static void doTransaction2() {
    BigDecimal amount = new BigDecimal(2.0);
    BigDecimal debit = new BigDecimal(1.1);
    System.out.println(amount.subtract(debit));
}

private static void doTransaction3() {
    BigDecimal amount = new BigDecimal("2.0");
    BigDecimal debit = new BigDecimal("1.1");
    System.out.println(amount.subtract(debit));
}