SUN公司SCJP题库

《SUN公司SCJP题库》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、yModule1-JAVA基础一、选择题：Question1Given:35.String#name="JaneDoe";36.int$age=24;37.Double_height=123.5;38.double~temp=37.5;Whichtwoaretrue?(Choosetwo.)A.Line35willnotcompile.B.Line36willnotcompile.C.Line37willnotcompile.D.Line38willnotcompile.Answer:AD标识符以字母，下划线，或者$开始Question2Given:11.publicclassTe

2、st{12.publicstaticvoidmain(String[]args){13.intx=5;14.booleanb1=true;15.booleanb2=false;16.17.if((x==4)&&!b2)18.System.out.print("l");19.System.out.print("2");20.if((b2=true)&&b1)21.System.out.print("3");22.}23.}Whatistheresult?A.2B.3C.12D.23E.123F.Compilationfails.G.Anexceptionalisthrownatrun

3、time.Answer:D注意20行，=为赋值，不要被骗Question3Given:42.publicclassClassA{43.publicintgetValue(){44.intvalue=0;45.booleansetting=true;46.Stringtitle="Hello";47.if(value

4、

5、(setting&&title=="Hello")){return1;}48.if(value==1&title.equals("Hello")){return2;}49.}50.}And:70.ClassAa=newClassA();2171.a.getValue(

6、);Whatistheresult?A.1B.2C.Compilationfails.D.Thecoderunswithnooutput.E.Anexceptionisthrownatruntime.Answer:C编译不通过，47行value为int类型不是booleanQuestion4Given:11.publicvoidtestIfA(){12.if(testIfB("True")){13.System.out.println("True");14.}else{15.System.out.println("Nottrue");16.}17.}18.publicBoolean

7、testIfB(Stringstr){19.returnBoolean.valueOf(str);20.}WhatistheresultwhenmethodtestIfAisinvoked?A.TrueB.NottrueC.Anexceptionisthrownatruntime.D.Compilationfailsbecauseofanerroratline12.E.Compilationfailsbecauseofanerroratline19.Answer:A19行，如果str为true则返回ture，否则返回falseQuestion5Given:11.publicstat

8、icvoidmain(String[]args){12.Integeri=newInteger(1)+newInteger(2);13.switch(i){14.case3:System.out.println("three");break;15.default:System.out.println("other");break;16.}17.}Whatistheresult?A.threeB.otherC.Anexceptionisthrownatruntime.D.Compilationfailsbecauseofanerroronline12.E.Compilationfai

9、lsbecauseofanerroronline13.F.Compilationfailsbecauseofanerroronline15.Answer:A就是两个Integer类型相加Question6Given:11.publicstaticvoidmain(String[]args){12.Stringstr="null";13.if(str==null){14.System.out.println("null");15.}else(str.length()==