Web Reference: May 11, 2024 · The instanceof operator works on the principle of the is-a relationship. The concept of an is-a relationship is based on class inheritance or interface implementation. Jul 23, 2025 · In Java, instanceof is a keyword used for checking if a reference variable contains a given type of object reference or not. Following is a Java program to show different behaviors of instanceof. You can already do this with Java; however, pattern matching introduces new language enhancements that enable you to conditionally extract data from objects with code that's more concise and robust. For background information about pattern matching for the instanceof operator, see JEP 394.
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