单项选择题

现有: 
class Wrench f 
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 wrl,  Wrench wr2)  {    
Wrench wr3=wrl; wrl=wr2; wr2=wr3;    
return wr3;     
}      
结果是什么?()     

A. false
B. true
C.编译失败
D.运行的时候有异常抛出

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