Since Java 21, wrapper classes have played an increasingly sophisticated role in Java’s type system. Here’s everything you need to know about updates for virtual threads, pattern matching, and ...

In Java, a POJO (Plain Old Java Object) class is a class that encapsulates data and provides getter and setter methods for accessing and modifying that data.

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Sealed classes in Java let developers limit the creation and use of subclasses and preserve the class hierarchy. Here is how sealed classes in Java work.

01 POJO与JavaBean 在具体学习JavaBean之前，先介绍一个与之相近的概念POJO (Plain Ordinary Java Object，简单Java对象)。 POJO是一个普通的Java类，不继承或者实现具体的类或者接口，拥有若干可读写的私有属性，并且属性具有getter以及setter方法，供外部对象或者应用进行访问。