题目内容:
程序:classTestReference{publicstaticvoidmain(String[]args){intx=2;TestReferencetr=newTestReference();System.out.print(x);tr.change(x);System.out.print(x);}publicvoidchange(intnum){num=num+1;}}程序运行后的输出是哪项?()
A.23
B.21
C.22
D.编译错误
参考答案:
程序:classTestReference{publicstaticvoidmain(String[]args){intx=2;TestReferencetr=newTestReference();System.out.print(x);tr.change(x);System.out.print(x);}publicvoidchange(intnum){num=num+1;}}程序运行后的输出是哪项?()
A.23
B.21
C.22
D.编译错误