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The CurrencyAmount type is now immutable. This means that you now cannot change the amount or currency of an
instance; instead a new instance must be created. This brings CurrencyAmount into line with some of Java's
core types and makes it's use far safer. However, it also means that some of the old operations are no longer
supported, and some have been modified. The add(CurrencyAmount), subtract(CurrencyAmount) and apply(Rate)
methods have been altered so they no longer modify the instance they are invoked upon, but instead return new
instance.

Where you previously used would have done:

total.add(additionalAmount);

you would replace this with:

total=total.add(additionalAmount);

The same is true for the subtract() and apply() methods. The methods which modified the amount or currency
properties have been removed. Where you previously might have changed a CurrencyAmount's currency as follows:

total.setCurrency(Currency.GBP);

you would now replace this with:

total=new CurrancyAmount(total.getAmount(), Currency.GBP);

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The CurrencyAmount type is now immutable. This means that you now cannot change the amount or currency of an instance; instead a new instance must be created. This brings CurrencyAmount into line with some of Java's core types and makes it's use far safer. However, it also means that some of the old operations are no longer supported, and some have been modified. The add(CurrencyAmount), subtract(CurrencyAmount) and apply(Rate) methods have been altered so they no longer modify the instance they are invoked upon, but instead return new instance. Where you previously used would have done: total.add(additionalAmount); you would replace this with: total=total.add(additionalAmount); The same is true for the subtract() and apply() methods. The methods which modified the amount or currency properties have been removed. Where you previously might have changed a CurrencyAmount's currency as follows: total.setCurrency(Currency.GBP); you would now replace this with: total=new CurrancyAmount(total.getAmount(), Currency.GBP);