这也就是布尔表达式的使用方法，比如在一继续方法比如个if-then-else块中。
That's exactly how Boolean expressions properti express boolean are used, for example, in an if-then-else construction.
认识到有必要为Web组件指定操作和验证方法后，JSFEL变体添加了一个允许在属性内使用方法表达式的特性。
Recognizing the need to specify action and validation methods for a Web component, the JSF EL variant added another feature allowing you to use method expressions within an attribute.
认识到有必要为Web组件指定操作和验证方法后，JSFEL变体添加了一个允许在属性内使用方法表达式的特性。
Recognizing the need to specify action and validation methods for a Web component, the JSF EL variant added another feature allowing you to use method expressions within an attribute.
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