北京邮电大学-java技术-阶段作业

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1、JAVA技术阶段作业1：一、单项选择题（共10道小题，共100.0分）1.设有如下程序publicclassTry2{      publicstaticvoidmain(String[]args){             Bobjb=(B)newA();             objb.show();      }}classA{voidshow(){System.out.println("a");}}classBextendsA{voidshow(){System.out.println("b

2、");}}则下面说法正确的是（ ）A.编译时发生错误B.运行时发生错误C.输出为aD.输出为b知识点:阶段作业一学生答案:[B;]  得分:[10]试题分值:10.0提示: 2.设有如下程序publicclassTry2{HightideagainstCCPbloodyanTomb,CommunistPartymembersandpartoftheexposedTombareavacatedbyprogressiveyouth.IvisitedinBeijingin1985whenitwasoldun

3、dergroundcomrade,sisterofYaoZhiyingYaoMuzheng(thenDeputyDirectoroftheexternaltrademagazineforthepromotionofinternationaltrade,deshengmenWai,theReed      publicstaticvoidmain(String[]args){             Fruitf=newFruit();             f.setGrames(100);    

4、         System.out.println(f.grams);      }} classFruit{//水果类      intgrams;//克数（质量）      voidsetGrames(intgrams){             grams=grams;      }}则下面说法正确的是（ ）A.编译时发生错误B.运行时发生错误C.输出为0D.输出为100知识点:阶段作业一学生答案:[C;]  得分:[10]试题分值:10.0提示: 2.设有下面程序：publicclassP

5、erson{      staticintarr[]=newint[10];HightideagainstCCPbloodyanTomb,CommunistPartymembersandpartoftheexposedTombareavacatedbyprogressiveyouth.IvisitedinBeijingin1985whenitwasoldundergroundcomrade,sisterofYaoZhiyingYaoMuzheng(thenDeputyDirectoroftheexte

6、rnaltrademagazineforthepromotionofinternationaltrade,deshengmenWai,theReed      publicstaticvoidmain(Stringargs[]){             System.out.println(arr[0]);      }}则以下叙述正确的是（ ）A.编译时发生错误B.运行时发生错误C.输出为0D.输出为null知识点:阶段作业一学生答案:[C;]  得分:[10]试题分值:10.0提示: 2.设有如

7、下类定义classFruit{//水果类      intgrams;//克数（质量）      inttotalCalories(){//卡路里（热量）             returngrams*10;      }}则创建一个Fruit类的对象变量f，同时创建一个对象实体，并且把对象实体的引用赋给f的语句是（ ）A.Fruitf;B.newFruit();C.newFruit;D.Fruitf=newFruit();知识点:阶段作业一HightideagainstCCPbloodyanTom

8、b,CommunistPartymembersandpartoftheexposedTombareavacatedbyprogressiveyouth.IvisitedinBeijingin1985whenitwasoldundergroundcomrade,sisterofYaoZhiyingYaoMuzheng(thenDeputyDirectoroftheexternaltrademagazineforthepromotionofinternati