以下代码运行输出是（）classMan{ privateStringname=Jack; intage=30;}publicclassManTest{ publicStringtel; publicstaticvoidmain(String[]args){ Manm=newMan(); System.out.println(m.name); }}

分析下面的程序，写出运行结果。classExercises6_3{classDog{privateStringname;privateintage;publicintstep;Dog(Strings,inta){name=s;age=a;step=0;}publicvoidrun(Dogfast){fast.step++;}}publicstaticvoidmain(Stringargs[]){Exercises6_3a=newExercises6_3();Dogd=a.newDog("Tom",3);d.step=29;d.run(d);System.out.println(""+d.step);}}运行结果是：（）

从下面四段（）代码中选择出正确的代码段（） A: abstractclassName{privateStringname;publicabstractbooleanisStupidName(Stringname){}} B: publicclassSomething{voiddoSomething(){privateStrings="";intl=s.length();}} C: publicclassSomething{publicstaticvoidmain(String[]args){Othero=newOther();newSomething().addOne(o);}publicvoidaddOne(finalOthero){o.i++;}}classOther{publicinti;} D: publicclassSomething{publicintaddOne(finalintx){return++x;}}