What are best practices for working with Pattern matching for instanceof?

Pattern matching for instanceof is a powerful feature introduced in Java 14, which simplifies the code and makes it more readable. Here are some best practices for using this feature:

  • Minimize Type Casting: Avoid unnecessary casting when checking the type of an object.
  • Use With Type Hierarchies: Leverage pattern matching in class hierarchies to streamline your code.
  • Combine with Switch Expressions: Use alongside switch expressions for cleaner conditional logic.
  • Readability: Keep code readable by using meaningful variable names in the pattern matching expressions.

For example:

Object obj = new String("Hello"); if (obj instanceof String s) { System.out.println(s.toUpperCase()); }

Pattern matching instanceof Java best practices readable code type checking

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