JAVA generic wildcard 1

import java.util.ArrayList;
import java.util.List;

import javax.xml.soap.Text;

/*
* Generic wildcard?
*
* Wildcards:
*1. Generally used to declare variables and formal parameters
*2. Cannot be used to create objects and generic methods, generic classes, and generic interfaces.
*
*
*
*/

public class Windous {

public static void main(String[] args) {

    List<?> list=new ArrayList<String>();//一般不能用于添加数据，应用来读取数据

      text(list);
}
public static void text(List<?> list) {

}

}
key content