[Groovy] 请教groovy 中的delegate 和 this 及owner的关系
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dellsoft
2007-10-13
如题，有人能解释一下三者的关系吗？
官方文档上有个代码？ class Class1 { def closure = { println this.class.name println delegate.class.name def nestedClos = { println owner.class.name } nestedClos() } } def clos = new Class1().closure clos.delegate = this clos() /* prints: Class1 Script1 Class1$_closure1 */ 希望能解释一下啊 |
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agile_boy
2007-10-23
this, owner, and delegate
this : as in Java, this refers to the enclosing class where a Closure is defined owner : the enclosing object (this or a surrounding closure) delegate : by default the same as owner, but changeable for example in a builder or ExpandoMetaClass 上面是官方的说明，我的理解是： this根java差不多，不需要多做说明。 owner是当前代码块属于谁的，示例就是很好的说明。 delegate默认跟owner相同，但是可以被改变，有了delegate可以让closure更灵活，比如可以设置owner以外的properties。 |
