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Java认证考试

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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;
正确答案:F
答案解析:
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