我们知道,在object中定义apply方法后,我们可以把()操作,转化为apply函数,如:
object test {def apply(s:String) = s*2
}
<p>则test(“a")实际上是test.apply(“a") 那么,下面这段代码呢? <pre class="csharpcode"><span class="kwrd">class</span> A { def apply(s:String) = s*2 }
虽然我们不能直接A(“a”),但是我们可以:
val a = new A
a(“a”)<style type="text/css">.csharpcode, .csharpcode pre { font-size: small; color: black; font-family: consolas, "Courier New", courier, monospace; background-color: #ffffff; /*white-space: pre;*/ } .csharpcode pre { margin: 0em; } .csharpcode .rem { color: #008000; } .csharpcode .kwrd { color: #0000ff; } .csharpcode .str { color: #006080; } .csharpcode .op { color: #0000c0; } .csharpcode .preproc { color: #cc6633; } .csharpcode .asp { background-color: #ffff00; } .csharpcode .html { color: #800000; } .csharpcode .attr { color: #ff0000; } .csharpcode .alt { background-color: #f4f4f4; width: 100%; margin: 0em; } .csharpcode .lnum { color: #606060; } </style> <p>即,将实例的()操作,转化为apply。