对 Date 对象使用 Groovy 比较运算符

发布于 2024-10-16 10:31:40 字数 863 浏览 6 评论 0原文

我正在调查一个问题，并遇到一些可疑代码，涉及使用比较运算符比较日期实例。例如

    def stamp = ... //Date
    def offset = ... //Integer
    def d = new Date(stamp.time + offset)
    if (d < new Date()) {
        ...
    }

This 资源表明上述内容等效于以下内容

    def stamp = ... //Date
    def offset = ... //Integer
    def d = new Date(stamp.time + offset)
    if (d.compareTo(new Date()) < 0) {
        ...
    }

但是，关于日期的 GDK 文档仅包含使用 compareTo 比较日期的示例，< code>before 和 after 我似乎记得特别避免在日期上使用比较运算符，因为有过意外结果的经历。上述两个代码示例是否确实等效（也就是说，我可以安全地在 Groovy 中的日期上使用比较运算符，还是应该只使用 compareTo、before 和 之后）？

谢谢！

原文

I'm investigating an issue and ran across some suspicious code involving comparison of Date instances using comparison operators. e.g.

    def stamp = ... //Date
    def offset = ... //Integer
    def d = new Date(stamp.time + offset)
    if (d < new Date()) {
        ...
    }

This resource indicates the above is equivalent to the following

    def stamp = ... //Date
    def offset = ... //Integer
    def d = new Date(stamp.time + offset)
    if (d.compareTo(new Date()) < 0) {
        ...
    }

However, the GDK documentation on Dates only has examples comparing dates using compareTo, before, and after and I seem to recall specifically avoiding using the comparison operators on Dates due to an experience with unexpected results. Are the above two code examples indeed equivalent (that is, can I safely use comparison operators on Dates in Groovy, or should I only use compareTo, before, and after)?

Thanks!

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删除会话 2024-10-23 10:31:40

如果您将它们插入方便的 GroovyConsole，它们会得到相同的结果。

如果我正确理解了这个问题：

def stamp = Date.parse("MM/dd/yyyy","02/02/2010")
def offset = 1213123123
def d = new Date(stamp.time+offset)
if(d < new Date() ) { 
    println "before"
}
if(d.compareTo(new Date()) < 0) { 
    println "before"
}

打印“之前”两次

如果我将邮票日期切换到 2011 年，可以说它不会打印。

Well if you plug them into the handy GroovyConsole they have the same result.

If I understand the question correctly:

def stamp = Date.parse("MM/dd/yyyy","02/02/2010")
def offset = 1213123123
def d = new Date(stamp.time+offset)
if(d < new Date() ) { 
    println "before"
}
if(d.compareTo(new Date()) < 0) { 
    println "before"
}

Prints "before" twice

If I switched the stamp date to 2011 lets say it would not print.

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