From the course: Pattern Matching for Switch in Java 21
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Motivation: Pattern matching for instanceof - Java Tutorial
From the course: Pattern Matching for Switch in Java 21
Motivation: Pattern matching for instanceof
- [Instructor] You saw how the traditional instance of operator works. In the traditional instance of operator, it only takes in a type like string, for example. Pattern matching was introduced to be used with the instance of operator where it is extended to take a type pattern instead of just a type. What's a type pattern? Consider this. If obj instance of string is on the right hand side, it's a type pattern. Here the pattern is a test or predicate plus a target and a pattern variable. By the way, a predicate is a bullion valued function with one argument. For example, here, the instance of operator testing if the obj argument is a string is a predicate. Target is the argument of the predicate. For example, obj here. Pattern variable source data about the target only if the predicate returns true. For example, the pattern variable is s here, so the type pattern is String s here. Here is how it works. The instance of operator matches the target object to the type pattern in this…
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