String... Variable length parameter list

See once String… when , What's the grammar , After searching for information , It was originally called variable length parameter list

String…

1. Parameter type is String;
2. The number of parameters is 0 individual , Or more ; String… It can be compared to an array String[], Variable array length ( The length can be 0, It can also be greater than 0)

public class DemoController  {
    

    public  void test(String aa){
    
        run();
        run("a");
        run("a","b");
        run("a","b","c");

        /* run("a","b","c",.......); */

        run(new String[]{
    "a","b","c","d","e"});
    }

    /*public void run(){ }*/

    public void run(String... strings){
    
        for (String item:strings) {
    
            String s = item;
        }
    }
}

When calling run() when , Call parameterless methods first run(), When there is no parameter free method run(), Call again run(String… strings)