单选题import java.util.*;  class ScanStuff {  public static void main(String [] args) {  String s = "x,yy,123";  Scanner sc = new Scanner(s);  while (sc.hasNext())  System.out.print(sc.next() + " ");  }  }  结果是什么?()Ax yyBx,yyCx yy 123Dx,yy,123

单选题
import java.util.*;  class ScanStuff {  public static void main(String [] args) {  String s = "x,yy,123";  Scanner sc = new Scanner(s);  while (sc.hasNext())  System.out.print(sc.next() + " ");  }  }  结果是什么?()
A

x yy

B

x,yy

C

x yy 123

D

x,yy,123


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单选题Given a class Repetition:  1. package utils;  2.  3. public class Repetition {  4. public static String twice(String s) { return s + s; }  5. }  and given another class Demo:  1. // insert code here 2.  3. public class Demo {  4. public static void main(String[] args) {  5. System.out.println(twice(”pizza”));  6. }  7. }  Which code should be inserted at line 1 of Demo.java to compile and run Demo to print“pizzapizza”?()A import utils.*;B static import utils.*;C import utils.Repetition.*;D static import utils.Repetition. *;E import utils.Repetition.twice();F import static utils.Repetition.twice;G static import utils.Repetition.twice;

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