import java.util.scanner是什么意思

​import java.util.scanner; 
public class demo { 
    public static void main(string[] wqs) { 
        string mystr=""; 
        system.out.print("请你输入字符,按回车结束"); 
        scanner in = new scanner(system.in); 
        mystr=in.nextline(); 
        system.out.print("你输入的字符串是"+mystr);
    }
}