String... to 可变参数的使用

 public class testMail {

     public static void fun(int... x) {
           for(int i = 0;i < x.length;i++) {
               System.out.print(x[i] + ",");
               }
           }
         public static void main(String args[]) throws Exception{
             fun(5);  System.out.println("");
             fun(5,6);  System.out.println("");
             fun(5,6,7);
             }
 }

输出：
5,

5,6,

5,6,7,