java报错ArrayList

Question

代码

import java.util.ArrayList;
import java.util.Spliterator;

public class HelloWorld {
    public static void main(String[] args) {
        ArrayList<String> list1 = new ArrayList<>();
    }
}

跟着视频操作的没问题，但是我的new ArrayList<>();会报错，报错内容如下：

Exception in thread "main" java.lang.Error: Unresolved compilation problems: 
    Type mismatch: cannot convert from ArrayList<?> to ArrayList<String>
    Cannot instantiate the type ArrayList<?>
    Syntax error on token "<", ? expected after this token

    at HelloWorld.main(HelloWorld.java:6)

还请大家帮忙看看是什么问题

Answer 1

加个String看看

        ArrayList<String> list1 = new ArrayList<String>();