Java1.5新功能可变长方法参数－varargs

Java1.5提供了一个叫varargs的新功能，就是可变长度的参数。
在以前的jdk版本中，对象中一个方法的入参个数在写好后就是固定的，而varargs提供了可变长度的功能，有点类似于main方法的参数String[] args，我们在命令行运行时args可数是可变的。
使用varargs写法是这样的 public Guitar(String builder, String model, String... features); 用省略号...声明features为可变长度的参数。
你申明如下方法
public Guitar(String builder, String model, String... features)
编译时将被解释为:
public Guitar(String builder, String model, String[] features)

但是他是有一些限制的.首先你在一个方法中只能使用一个省略号定义，也就是只能定义一个可变长的参数。 下面的定义是不合法的 public Guitar(String builder, String model,
String... features, float... stringHeights)
我们可以用下面的方法取得可变长参数：
public Guitar(String builder, String model,GuitarWood backSidesWood, GuitarWood topWood,
float nutWidth,GuitarInlay fretboardInlay, GuitarInlay topInlay,String... features) {
this.builder = builder;
this.model = model;
this.backSidesWood = backSidesWood;
this.topWood = topWood;
this.nutWidth = nutWidth;
this.fretboardInlay = fretboardInlay;
this.topInlay = topInlay;
    for (String feature : features) {
      System.out.println(feature);
    }
}
我们也可以这样获取可变长参数值，把features直接赋给String[]，或者其他集合类型
// Variable declaration
private List features;
// Assignment in method or constructor body
this.features = java.util.Arrays.asList(features);

以上内容摘自：
http://www.onjava.com/pub/a/onjava/excerpt/javaadn_chap5/index.html
http://www.onjava.com/catalog/javaadn/excerpt/javaadn_ch05.pdf
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