在上课之前或在主课中导入扫描仪之间有区别吗

Question

这样导入扫描仪之间有区别

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
    }
}

然后做

public class Main {
    public static void main(String[] args) {
        java.util.Scanner sc = new java.util.Scanner(System.in);
    }
}