![]() ![]() To make it clear that the null is a valid input, you can use a annotation. ![]() How does the programmer who calls a method knows if he can safely pass the null? For which parameters nulls are acceptable and which are mandatory? Just pass the null and the compiler is happy. You don’t have any object which is required as one of method’s parameters? No problem. Why just don’t pass the null around? It’s a simple solution which doesn’t require any extra work. I’ll walk you through from the simplest to more complex. You can tackle Java optional parameters in method in several different ways. We’ll stop for a moment to look at Java 8 Optional and assess if it fits our needs.Īdvertisement 1. We’ll focus on regular method, class constructors with optional fields, and quickly look at bad practices of the discussed topic. No matter it is inside a DTO, a fat model domain object, or a simple stateless service class, optional method parameters are common.įrom this article you will learn how to handle optional parameters in Java. The optional parameters block is defined within a pair of curly brackets and is a comma-separated list.When you design a method in a Java class, some parameters may be optional for its execution. Optional parameters must appear in a block together after all positional parameters are defined. Any parameters not populated default to null or the specified default value. The calling code can provide arguments to populate each of the optional parameters. ![]()
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