Java:Variable argument lists

 1 class A {
 2 }
 3 
 4 public class NewVarArgs {
 5 
 6     static void printArray(Object... args) {
 7         for (Object obj : args) {
 8             System.out.print(obj + " ");
 9         }
10         System.out.println();
11     }
12 
13     public static void main(String[] args) {
14         printArray(new Integer(67), new Double(78.0));
15         printArray(67, 455.33f, 54.54);
16         printArray("ads", "asdas", "asdasd");
17         printArray(new A(), new A(), new A());
18         printArray();//可以为空
19     }
20 }

输出

67 78.0 
67 455.33 54.54 
ads asdas asdasd 
A@c17164 A@1fb8ee3 A@61de33

另一个例子

 1 public class OptionalTrailingArguments {
 2     static void f(int required,String...trailing){  //参数类型不一样
 3         System.out.print("required: "+required+" ");
 4         for(String s:trailing){
 5             System.out.print(s+" ");
 6         }
 7         System.out.println();
 8     }
 9     public static void main(String[]args){
10         f(1,"one");
11         f(2,"two","three");
12         f(3);
13     }
14 }

required: 1 one 
required: 2 two three 
required: 3