【单项选择题】
class Wrench { <br /> public static void main（String [] args） { <br /> Wrench w = new Wrench（）； Wrench w2 = new Wrench（）； <br /> w2 = go（w，w2）； <br /> System.out.print（w2 == w）； <br /> } <br /> static Wrench go（Wrench wr1， Wrench wr2） { <br /> Wrench wr3 = wr1； wr1 = wr2； wr2 = wr3； <br /> return wr3；<br /> } <br /> } <br /> 结果是什么？（） <p> class Wrench { <br /> public static void main（String [] args） { <br /> Wrench w = new Wrench（）； Wrench w2 = new Wrench（）； <br /> w2 = go（w，w2）； <br /> System.out.print（w2 == w）； <br /> } <br /> static Wrench go（Wrench wr1， Wrench wr2） { <br /> Wrench
A、A.true
B、B.false
C、C.编译失败
D、D.输出不可预期
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