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Polymorphically handle result of subtraction

I have an amount class which provides the minus method among others. The result of this operation is of course another amount. The question is how can I handle the three cases according to the signum ...
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Succinct Lazy Initialization Pattern

Background I often use the following lazy initialization pattern: public class Clazz { private Object object; private Object getObject() { Object object = this.object; if( object == ...