问题

publicclassPet{privateStringname;publicPet(){System.out.print(1);}publicPet(Stringname){Sy

publicclassPet{privateStringname；publicPet（）{System.out.print（1）；}publicPet（Stringname）{System.out.print（2）；}}publicclassDogextendsPet{publicDog（）{System.out.print（4）；}publicDog（Stringname）{super（name）；System.out.print（3）；}}执行newDog（棕熊”）；后程序输出是哪项？（）

A.33

B.13

C.23

D.123

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