class Wrench {  public static void main（String [] args） {  Wrench w = new Wrench（）； Wrench w2 = new Wrench（）；  w2 = go（w，w2）；  System.out.print（w2 == w）；  }  static Wrench go（Wrench wr1， Wrench wr2） {  Wrench wr3 = wr1； wr1 = wr2； wr2 = wr3；  return wr3； }  }  结果是什么？（） 

• A、true
• B、false
• C、编译失败
• D、输出不可预期