现有： 
class  Wrench2  {     
int size； 
public static void main（String  []  args）  {     
Wrench2 w=new Wrench2（）；     
w.size=II； 
Wrench2 w2=go（w， w.size）；    
System. out .print （w2. size）；     
} 
static Wrench2 go（Wrench2 wr. int s）  {     
S=12； 
return wr；    
}    
}
结果为（）    

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？（）     

现有： 
class Passer f 
static final int X=5； 
public  static void main （String  []  args）  {     
new  Passer（）．go （x）；     
System. out .print （x）；     
} 
void go （int x）  {    
System. out .print（x++）；    
}    
结果是什么？（）     

现有： 
class Top  { 
static int x=l； 
public Top （inty）  {  x*=3；  }     
} 
class Middle extends Top {     
public Middle（）  {x+=1；  ） 
public  static void main （String  []  args）  {     
Middle m = new Middle（）；     
System. out .println （x）；     
}    
}     
结果为：（）