java 传参数时 类型后跟 3个点 "...&am…

 1 import java.util.ArrayList;
 2 
 3 public class StringDemo {
 4     public static void main(String[] args) {
 5         testPoint("LOL"); //一个参数传入
 6         testPoint("L","O","L"); //3个String参数传入
 7         testPoint(new String[] {"L","O","L"}); //可以看到传入三个String参数和传入一个长度为3的数组结果一样
 8         
 9         testPoint(6);
10         testPoint(6,6,6);
11         testPoint(new Integer[] {6,6,6});
12         
13     }
14     
15     public static void testPoint(String ...s) {
16         if(s.length == 0) {
17             System.out.println("没有参数传入！");
18         }else if(s.length == 1) {
19             System.out.println("有一个参数传入,它是: "+s[0]);
20             System.out.println("------------------------");
21         }else {
22             System.out.println("the input String is-->");
23             for(int i = 0;i < s.length;++i) {
24                 System.out.println("第" + (i+1) +"个参数是"+s[i]+";");
25             }
26         }
27     }
28     
29     public static void testPoint(Integer ...itgr) {
30         if(itgr.length == 0) {
31             System.out.println("没有整数传入！");
32         }else if(itgr.length == 1) {
33             System.out.println("有一个整数传入,它是: "+itgr[0]);
34             System.out.println("------------------------");
35         }else {
36             System.out.println("the input String is-->");
37             for(int i = 0;i < itgr.length;++i) {
38                 System.out.println("第" + (i+1) +"个整数是"+itgr[i]+";");
39             }
40         }
41     }
42 
43 }