这里的错误是什么?它告诉 String 不是语句
import java.util.Scanner;
public class family{
public static void main( String[] args){
Scanner user_input = new Scanner(System.in);
String "first_name";
System.out.print("Enter your first name");
first_name= user_input.next();
String "surname";
System.out.print("Enter your Surname");
surname=user_input.next();
String "your_name";
your_name= first_name+" "+surname;
System.out.print(+your_name);
}
}