问题描述

我知道大多数变量名都可以与is"一起使用，例如 isBlue()，但has"是否也是有效前缀，例如 hasProperty()?

I know most variable names will work with "is", such as isBlue(), but is "has" also a valid prefix, like hasProperty()?

推荐答案

根据JavaBeans 规范 8.3.2 节:

According to the JavaBeans specification section 8.3.2:

布尔属性
此外，对于布尔属性，我们允许一个 getter匹配模式的方法:

public boolean is();

这"isPropertyName" 方法可能是提供而不是"get<PropertyName>" 方法，也可以除了提供一个get"方法.在任一情况下，如果 is 方法然后存在布尔属性我们将使用is<PropertyName>"方法来读取属性值.一个示例布尔属性可能是:

公共布尔 isMarsupial();public void setMarsupial(boolean m);

Boolean properties
In addition, for boolean properties, we allow a getter method to match the pattern:

public boolean is<PropertyName>();

This "isPropertyName" method may be provided instead of a "get<PropertyName>" method, or it may be provided in addition to a "get<PropertyName>" method. In either case, if the is<PropertyName> method is present for a boolean property then we will use the "is<PropertyName>" method to read the property value. An example boolean property might be:

public boolean isMarsupial(); public void setMarsupial(boolean m);

换句话说，除非从那以后发生了一些变化，否则 has 恐怕不是一个有效的前缀:(

In other words, unless something has changed since then, has isn't a valid prefix I'm afraid :(

有可能一些工具和库无论如何都会识别这些属性，但依赖它并不是一个好主意.

It's possible that some tools and libraries will recognise such properties anyway, but it's not a good idea to rely on it.