ListMap泛型使用问号

函数定义泛型List> map，编译无法通过，写成List> map即可

package seaboot.test;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

public class Test2 {
    public static void test(List> map) {

    }

    public static void main(String[] args) throws IOException {
        List> map = new ArrayList<>();
        test(map);
    }
}


package seaboot.test;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

public class Test2 {
    public static void test(Listextends Map> map) {

    }

    public static void main(String[] args) throws IOException {
        List> map = new ArrayList<>();
        test(map);
    }
}