> 原文:[https://www . geesforgeks . org/instance of-operator-vs-is instance-method-in-Java/](https://www.geeksforgeeks.org/instanceof-operator-vs-isinstance-method ...

Object obj = 5; if (obj instanceof String s) { System.out.println(s.length()); // Stringではないので何も表示されない } String s received obj as a ...

Here's everything you need to know about Java operators and operator types, and how to use them to write expressions for your Java programs. In this tutorial, you will learn how to write expressions ...