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单选题
class Wrench2 {  int size;  public static void main(String [] args) {  Wrench2 w = new Wrench2();  w.size = 9;  Wrench2 w2 = go(w, w.size);  System.out.print(w2.size);  }  static Wrench2 go(Wrench2 wr, int s) {  s = 7;  return wr;  }  }  结果为:()
A

7

B

9

C

编译失败

D

输出结果不可预料


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考题 单选题class Wrench2 {  int size;  public static void main(String [] args) {  Wrench2 w = new Wrench2();  w.size = 9;  Wrench2 w2 = go(w, w.size);  System.out.print(w2.size);  }  static Wrench2 go(Wrench2 wr, int s) {  s = 7;  return wr;  }  }  结果为:()A 7B 9C 编译失败D 输出结果不可预料