單項選擇題

現(xiàn)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;     
}      
結(jié)果是什么?()     

A. false
B. true
C.編譯失敗
D.運行的時候有異常拋出

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